diff --git a/DEPS b/DEPS
index bc4e1fe..a1a7c2c77 100644
--- a/DEPS
+++ b/DEPS
@@ -40,7 +40,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.
-  'skia_revision': '30229ac6282981c28ced8f513c8d09684d9d0581',
+  'skia_revision': 'c1b879f11b937142f5478bd3b416b26be93dea23',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.
@@ -96,7 +96,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling catapult
   # and whatever else without interference from each other.
-  'catapult_revision': 'f7bb286d01fdbedf1f6dd5921d564ef5f0344cb4',
+  'catapult_revision': '49eb11f63eb4d552d634833a01d2710208ba0523',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libFuzzer
   # and whatever else without interference from each other.
diff --git a/cc/paint/paint_op_buffer.cc b/cc/paint/paint_op_buffer.cc
index a98392a..fa62a41 100644
--- a/cc/paint/paint_op_buffer.cc
+++ b/cc/paint/paint_op_buffer.cc
@@ -120,8 +120,12 @@
     // in the PaintOpBuffer::Raster function as DisplayItemList calls
     // into RasterWithAlpha directly.
     if (op->record->approximateOpCount() == 1) {
-      op->record->GetFirstOp()->RasterWithAlpha(canvas, alpha);
-      return;
+      PaintOp* single_op = op->record->GetFirstOp();
+      // RasterWithAlpha only supported for draw ops.
+      if (single_op->IsDrawOp()) {
+        single_op->RasterWithAlpha(canvas, alpha);
+        return;
+      }
     }
 
     canvas->saveLayerAlpha(nullptr, alpha);
@@ -358,14 +362,6 @@
   g_raster_alpha_functions[type](this, canvas, alpha);
 }
 
-DrawDisplayItemListOp::DrawDisplayItemListOp(
-    scoped_refptr<DisplayItemList> list)
-    : list(list) {}
-
-size_t DrawDisplayItemListOp::AdditionalBytesUsed() const {
-  return list->ApproximateMemoryUsage();
-}
-
 int ClipPathOp::CountSlowPaths() const {
   return antialias && !path.isConvex() ? 1 : 0;
 }
@@ -412,6 +408,20 @@
 
 AnnotateOp::~AnnotateOp() = default;
 
+DrawDisplayItemListOp::DrawDisplayItemListOp(
+    scoped_refptr<DisplayItemList> list)
+    : list(list) {}
+
+size_t DrawDisplayItemListOp::AdditionalBytesUsed() const {
+  return list->ApproximateMemoryUsage();
+}
+
+DrawDisplayItemListOp::DrawDisplayItemListOp(const DrawDisplayItemListOp& op) =
+    default;
+
+DrawDisplayItemListOp& DrawDisplayItemListOp::operator=(
+    const DrawDisplayItemListOp& op) = default;
+
 DrawDisplayItemListOp::~DrawDisplayItemListOp() = default;
 
 DrawImageOp::DrawImageOp(const PaintImage& image,
diff --git a/cc/paint/paint_op_buffer.h b/cc/paint/paint_op_buffer.h
index b5f60a4d..333a290 100644
--- a/cc/paint/paint_op_buffer.h
+++ b/cc/paint/paint_op_buffer.h
@@ -22,14 +22,14 @@
 
 class DisplayItemList;
 
-class ThreadsafeMatrix : public SkMatrix {
+class CC_PAINT_EXPORT ThreadsafeMatrix : public SkMatrix {
  public:
   explicit ThreadsafeMatrix(const SkMatrix& matrix) : SkMatrix(matrix) {
     (void)getType();
   }
 };
 
-class ThreadsafePath : public SkPath {
+class CC_PAINT_EXPORT ThreadsafePath : public SkPath {
  public:
   explicit ThreadsafePath(const SkPath& path) : SkPath(path) {
     updateBoundsCache();
@@ -97,7 +97,7 @@
   static SkRect kUnsetRect;
 };
 
-struct PaintOpWithData : PaintOp {
+struct CC_PAINT_EXPORT PaintOpWithData : PaintOp {
   // Having data is just a helper for ops that have a varying amount of data and
   // want a way to store that inline.  This is for ops that pass in a
   // void* and a length.
@@ -127,13 +127,13 @@
   return op + 1;
 }
 
-struct PaintOpWithDataArrayBase : PaintOpWithData {
+struct CC_PAINT_EXPORT PaintOpWithDataArrayBase : PaintOpWithData {
   // Helper class for static asserts in push functions.
   using PaintOpWithData::PaintOpWithData;
 };
 
 template <typename T>
-struct PaintOpWithDataArray : PaintOpWithDataArrayBase {
+struct CC_PAINT_EXPORT PaintOpWithDataArray : PaintOpWithDataArrayBase {
   // Paint op that has a T[count] and a char[bytes].
   PaintOpWithDataArray(size_t bytes, size_t count)
       : PaintOpWithDataArrayBase(bytes), count(count) {}
@@ -157,7 +157,7 @@
   return SkTAddOffset<M>(op + 1, op->bytes);
 }
 
-struct AnnotateOp final : PaintOp {
+struct CC_PAINT_EXPORT AnnotateOp final : PaintOp {
   enum class AnnotationType {
     URL,
     LinkToDestination,
@@ -176,7 +176,7 @@
   sk_sp<SkData> data;
 };
 
-struct ClipPathOp final : PaintOp {
+struct CC_PAINT_EXPORT ClipPathOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::ClipPath;
   ClipPathOp(SkPath path, SkClipOp op, bool antialias)
       : path(path), op(op), antialias(antialias) {}
@@ -188,7 +188,7 @@
   bool antialias;
 };
 
-struct ClipRectOp final : PaintOp {
+struct CC_PAINT_EXPORT ClipRectOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::ClipRect;
   ClipRectOp(const SkRect& rect, SkClipOp op, bool antialias)
       : rect(rect), op(op), antialias(antialias) {}
@@ -199,7 +199,7 @@
   bool antialias;
 };
 
-struct ClipRRectOp final : PaintOp {
+struct CC_PAINT_EXPORT ClipRRectOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::ClipRRect;
   ClipRRectOp(const SkRRect& rrect, SkClipOp op, bool antialias)
       : rrect(rrect), op(op), antialias(antialias) {}
@@ -210,7 +210,7 @@
   bool antialias;
 };
 
-struct ConcatOp final : PaintOp {
+struct CC_PAINT_EXPORT ConcatOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::Concat;
   explicit ConcatOp(const SkMatrix& matrix) : matrix(matrix) {}
   void Raster(SkCanvas* canvas) const;
@@ -218,7 +218,7 @@
   ThreadsafeMatrix matrix;
 };
 
-struct DrawArcOp final : PaintOp {
+struct CC_PAINT_EXPORT DrawArcOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::DrawArc;
   static constexpr bool kIsDrawOp = true;
   static constexpr bool kHasPaintFlags = true;
@@ -241,7 +241,7 @@
   PaintFlags flags;
 };
 
-struct DrawCircleOp final : PaintOp {
+struct CC_PAINT_EXPORT DrawCircleOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::DrawCircle;
   static constexpr bool kIsDrawOp = true;
   static constexpr bool kHasPaintFlags = true;
@@ -258,7 +258,7 @@
   PaintFlags flags;
 };
 
-struct DrawColorOp final : PaintOp {
+struct CC_PAINT_EXPORT DrawColorOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::DrawColor;
   static constexpr bool kIsDrawOp = true;
   DrawColorOp(SkColor color, SkBlendMode mode) : color(color), mode(mode) {}
@@ -268,10 +268,15 @@
   SkBlendMode mode;
 };
 
-struct DrawDisplayItemListOp final : PaintOp {
+struct CC_PAINT_EXPORT DrawDisplayItemListOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::DrawDisplayItemList;
   static constexpr bool kIsDrawOp = true;
   explicit DrawDisplayItemListOp(scoped_refptr<DisplayItemList> list);
+  // Windows wants to generate these when types are exported, so
+  // provide them here explicitly so that DisplayItemList doesn't have
+  // to be defined in this header.
+  DrawDisplayItemListOp(const DrawDisplayItemListOp& op);
+  DrawDisplayItemListOp& operator=(const DrawDisplayItemListOp& op);
   ~DrawDisplayItemListOp();
   void Raster(SkCanvas* canvas) const;
   size_t AdditionalBytesUsed() const;
@@ -280,7 +285,7 @@
   scoped_refptr<DisplayItemList> list;
 };
 
-struct DrawDRRectOp final : PaintOp {
+struct CC_PAINT_EXPORT DrawDRRectOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::DrawDRRect;
   static constexpr bool kIsDrawOp = true;
   static constexpr bool kHasPaintFlags = true;
@@ -295,7 +300,7 @@
   PaintFlags flags;
 };
 
-struct DrawImageOp final : PaintOp {
+struct CC_PAINT_EXPORT DrawImageOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::DrawImage;
   static constexpr bool kIsDrawOp = true;
   static constexpr bool kHasPaintFlags = true;
@@ -312,7 +317,7 @@
   PaintFlags flags;
 };
 
-struct DrawImageRectOp final : PaintOp {
+struct CC_PAINT_EXPORT DrawImageRectOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::DrawImageRect;
   static constexpr bool kIsDrawOp = true;
   static constexpr bool kHasPaintFlags = true;
@@ -331,7 +336,7 @@
   PaintCanvas::SrcRectConstraint constraint;
 };
 
-struct DrawIRectOp final : PaintOp {
+struct CC_PAINT_EXPORT DrawIRectOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::DrawIRect;
   static constexpr bool kIsDrawOp = true;
   static constexpr bool kHasPaintFlags = true;
@@ -343,7 +348,7 @@
   PaintFlags flags;
 };
 
-struct DrawLineOp final : PaintOp {
+struct CC_PAINT_EXPORT DrawLineOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::DrawLine;
   static constexpr bool kIsDrawOp = true;
   static constexpr bool kHasPaintFlags = true;
@@ -363,7 +368,7 @@
   PaintFlags flags;
 };
 
-struct DrawOvalOp final : PaintOp {
+struct CC_PAINT_EXPORT DrawOvalOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::DrawOval;
   static constexpr bool kIsDrawOp = true;
   static constexpr bool kHasPaintFlags = true;
@@ -375,7 +380,7 @@
   PaintFlags flags;
 };
 
-struct DrawPathOp final : PaintOp {
+struct CC_PAINT_EXPORT DrawPathOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::DrawPath;
   static constexpr bool kIsDrawOp = true;
   static constexpr bool kHasPaintFlags = true;
@@ -388,7 +393,7 @@
   PaintFlags flags;
 };
 
-struct DrawPosTextOp final : PaintOpWithDataArray<SkPoint> {
+struct CC_PAINT_EXPORT DrawPosTextOp final : PaintOpWithDataArray<SkPoint> {
   static constexpr PaintOpType kType = PaintOpType::DrawPosText;
   static constexpr bool kIsDrawOp = true;
   static constexpr bool kHasPaintFlags = true;
@@ -399,7 +404,7 @@
   PaintFlags flags;
 };
 
-struct DrawRecordOp final : PaintOp {
+struct CC_PAINT_EXPORT DrawRecordOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::DrawRecord;
   static constexpr bool kIsDrawOp = true;
   explicit DrawRecordOp(sk_sp<const PaintRecord> record);
@@ -410,7 +415,7 @@
   sk_sp<const PaintRecord> record;
 };
 
-struct DrawRectOp final : PaintOp {
+struct CC_PAINT_EXPORT DrawRectOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::DrawRect;
   static constexpr bool kIsDrawOp = true;
   static constexpr bool kHasPaintFlags = true;
@@ -422,7 +427,7 @@
   PaintFlags flags;
 };
 
-struct DrawRRectOp final : PaintOp {
+struct CC_PAINT_EXPORT DrawRRectOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::DrawRRect;
   static constexpr bool kIsDrawOp = true;
   static constexpr bool kHasPaintFlags = true;
@@ -434,7 +439,7 @@
   PaintFlags flags;
 };
 
-struct DrawTextOp final : PaintOpWithData {
+struct CC_PAINT_EXPORT DrawTextOp final : PaintOpWithData {
   static constexpr PaintOpType kType = PaintOpType::DrawText;
   static constexpr bool kIsDrawOp = true;
   static constexpr bool kHasPaintFlags = true;
@@ -447,7 +452,7 @@
   PaintFlags flags;
 };
 
-struct DrawTextBlobOp final : PaintOp {
+struct CC_PAINT_EXPORT DrawTextBlobOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::DrawTextBlob;
   static constexpr bool kIsDrawOp = true;
   static constexpr bool kHasPaintFlags = true;
@@ -464,17 +469,17 @@
   PaintFlags flags;
 };
 
-struct NoopOp final : PaintOp {
+struct CC_PAINT_EXPORT NoopOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::Noop;
   void Raster(SkCanvas* canvas) const {}
 };
 
-struct RestoreOp final : PaintOp {
+struct CC_PAINT_EXPORT RestoreOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::Restore;
   void Raster(SkCanvas* canvas) const;
 };
 
-struct RotateOp final : PaintOp {
+struct CC_PAINT_EXPORT RotateOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::Rotate;
   explicit RotateOp(SkScalar degrees) : degrees(degrees) {}
   void Raster(SkCanvas* canvas) const;
@@ -482,12 +487,12 @@
   SkScalar degrees;
 };
 
-struct SaveOp final : PaintOp {
+struct CC_PAINT_EXPORT SaveOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::Save;
   void Raster(SkCanvas* canvas) const;
 };
 
-struct SaveLayerOp final : PaintOp {
+struct CC_PAINT_EXPORT SaveLayerOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::SaveLayer;
   static constexpr bool kHasPaintFlags = true;
   SaveLayerOp(const SkRect* bounds, const PaintFlags* flags)
@@ -501,7 +506,7 @@
   PaintFlags flags;
 };
 
-struct SaveLayerAlphaOp final : PaintOp {
+struct CC_PAINT_EXPORT SaveLayerAlphaOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::SaveLayerAlpha;
   SaveLayerAlphaOp(const SkRect* bounds, uint8_t alpha)
       : bounds(bounds ? *bounds : kUnsetRect), alpha(alpha) {}
@@ -511,7 +516,7 @@
   uint8_t alpha;
 };
 
-struct ScaleOp final : PaintOp {
+struct CC_PAINT_EXPORT ScaleOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::Scale;
   ScaleOp(SkScalar sx, SkScalar sy) : sx(sx), sy(sy) {}
   void Raster(SkCanvas* canvas) const;
@@ -520,7 +525,7 @@
   SkScalar sy;
 };
 
-struct SetMatrixOp final : PaintOp {
+struct CC_PAINT_EXPORT SetMatrixOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::SetMatrix;
   explicit SetMatrixOp(const SkMatrix& matrix) : matrix(matrix) {}
   // This is the only op that needs the original ctm of the SkCanvas
@@ -534,7 +539,7 @@
   ThreadsafeMatrix matrix;
 };
 
-struct TranslateOp final : PaintOp {
+struct CC_PAINT_EXPORT TranslateOp final : PaintOp {
   static constexpr PaintOpType kType = PaintOpType::Translate;
   TranslateOp(SkScalar dx, SkScalar dy) : dx(dx), dy(dy) {}
   void Raster(SkCanvas* canvas) const;
diff --git a/cc/paint/paint_op_buffer_unittest.cc b/cc/paint/paint_op_buffer_unittest.cc
index 5e0bf2aa..a962ab9 100644
--- a/cc/paint/paint_op_buffer_unittest.cc
+++ b/cc/paint/paint_op_buffer_unittest.cc
@@ -256,4 +256,77 @@
   EXPECT_EQ(draw_flags.getAlpha(), canvas.paint_.getAlpha());
 }
 
+// Verify that the save draw restore code works with a single op
+// that's not a draw op, and the optimization does not kick in.
+TEST(PaintOpBufferTest, SaveDrawRestore_SingleOpNotADrawOp) {
+  PaintOpBuffer buffer;
+
+  uint8_t alpha = 100;
+  buffer.push<SaveLayerAlphaOp>(nullptr, alpha);
+
+  buffer.push<NoopOp>();
+  buffer.push<RestoreOp>();
+
+  SaveCountingCanvas canvas;
+  buffer.playback(&canvas);
+
+  EXPECT_EQ(1, canvas.save_count_);
+  EXPECT_EQ(1, canvas.restore_count_);
+}
+
+// Test that the save/draw/restore optimization applies if the single op
+// is a DrawRecord that itself has a single draw op.
+TEST(PaintOpBufferTest, SaveDrawRestore_SingleOpRecordWithSingleOp) {
+  sk_sp<PaintRecord> record = sk_make_sp<PaintRecord>();
+
+  PaintFlags draw_flags;
+  draw_flags.setColor(SK_ColorMAGENTA);
+  draw_flags.setAlpha(50);
+  EXPECT_TRUE(draw_flags.SupportsFoldingAlpha());
+  SkRect rect = SkRect::MakeXYWH(1, 2, 3, 4);
+  record->push<DrawRectOp>(rect, draw_flags);
+  EXPECT_EQ(record->approximateOpCount(), 1);
+
+  PaintOpBuffer buffer;
+
+  uint8_t alpha = 100;
+  buffer.push<SaveLayerAlphaOp>(nullptr, alpha);
+  buffer.push<DrawRecordOp>(std::move(record));
+  buffer.push<RestoreOp>();
+
+  SaveCountingCanvas canvas;
+  buffer.playback(&canvas);
+
+  EXPECT_EQ(0, canvas.save_count_);
+  EXPECT_EQ(0, canvas.restore_count_);
+  EXPECT_EQ(rect, canvas.draw_rect_);
+
+  float expected_alpha = alpha * 50 / 255.f;
+  EXPECT_LE(std::abs(expected_alpha - canvas.paint_.getAlpha()), 1.f);
+}
+
+// The same as the above SingleOpRecord test, but the single op is not
+// a draw op.  So, there's no way to fold in the save layer optimization.
+// Verify that the optimization doesn't apply and that this doesn't crash.
+// See: http://crbug.com/712093.
+TEST(PaintOpBufferTest, SaveDrawRestore_SingleOpRecordWithSingleNonDrawOp) {
+  sk_sp<PaintRecord> record = sk_make_sp<PaintRecord>();
+  record->push<NoopOp>();
+  EXPECT_EQ(record->approximateOpCount(), 1);
+  EXPECT_FALSE(record->GetFirstOp()->IsDrawOp());
+
+  PaintOpBuffer buffer;
+
+  uint8_t alpha = 100;
+  buffer.push<SaveLayerAlphaOp>(nullptr, alpha);
+  buffer.push<DrawRecordOp>(std::move(record));
+  buffer.push<RestoreOp>();
+
+  SaveCountingCanvas canvas;
+  buffer.playback(&canvas);
+
+  EXPECT_EQ(1, canvas.save_count_);
+  EXPECT_EQ(1, canvas.restore_count_);
+}
+
 }  // namespace cc
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/TabState.java b/chrome/android/java/src/org/chromium/chrome/browser/TabState.java
index 1141e99..6dde2d77 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/TabState.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/TabState.java
@@ -13,6 +13,7 @@
 import org.chromium.base.StreamUtil;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.browser.tab.Tab;
+import org.chromium.components.sync.SyncConstants;
 import org.chromium.content.browser.crypto.CipherFactory;
 import org.chromium.content_public.browser.WebContents;
 
@@ -257,9 +258,9 @@
             try {
                 tabState.syncId = stream.readLong();
             } catch (EOFException eof) {
-                tabState.syncId = 0;
+                tabState.syncId = SyncConstants.INVALID_TAB_NODE_ID;
                 // Could happen if reading a version of TabState without syncId.
-                Log.w(TAG, "Failed to read syncId from tab state. Assuming syncId is: 0");
+                Log.w(TAG, "Failed to read syncId from tab state. Assuming syncId is: -1");
             }
             try {
                 tabState.shouldPreserve = stream.readBoolean();
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadInfo.java b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadInfo.java
index 0932df91..233c85c 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadInfo.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadInfo.java
@@ -4,11 +4,14 @@
 
 package org.chromium.chrome.browser.download;
 
+import android.graphics.Bitmap;
+
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.components.offline_items_collection.ContentId;
 import org.chromium.components.offline_items_collection.LegacyHelpers;
 import org.chromium.components.offline_items_collection.OfflineItem;
 import org.chromium.components.offline_items_collection.OfflineItemState;
+import org.chromium.components.offline_items_collection.OfflineItemVisuals;
 import org.chromium.content_public.browser.DownloadState;
 
 /**
@@ -42,6 +45,7 @@
     private final ContentId mContentId;
     private final boolean mIsOpenable;
     private final boolean mIsTransient;
+    private final Bitmap mIcon;
 
     private DownloadInfo(Builder builder) {
         mUrl = builder.mUrl;
@@ -74,6 +78,7 @@
         }
         mIsOpenable = builder.mIsOpenable;
         mIsTransient = builder.mIsTransient;
+        mIcon = builder.mIcon;
     }
 
     public String getUrl() {
@@ -182,12 +187,16 @@
         return mIsTransient;
     }
 
+    public Bitmap getIcon() {
+        return mIcon;
+    }
+
     /**
      * Helper method to build a {@link DownloadInfo} from an {@link OfflineItem}.
      * @param item The {@link OfflineItem} to mimic.
      * @return     A {@link DownloadInfo} containing the relevant fields from {@code item}.
      */
-    public static DownloadInfo fromOfflineItem(OfflineItem item) {
+    public static DownloadInfo fromOfflineItem(OfflineItem item, OfflineItemVisuals visuals) {
         int state;
         switch (item.state) {
             case OfflineItemState.COMPLETE:
@@ -225,6 +234,7 @@
                 .setBytesReceived(item.receivedBytes)
                 .setPercentCompleted(item.percentCompleted)
                 .setTimeRemainingInMillis(item.timeRemainingMs)
+                .setIcon(visuals == null ? null : visuals.icon)
                 .build();
     }
 
@@ -257,6 +267,7 @@
         private ContentId mContentId;
         private boolean mIsOpenable = true;
         private boolean mIsTransient;
+        private Bitmap mIcon;
 
         public Builder setUrl(String url) {
             mUrl = url;
@@ -384,6 +395,11 @@
             return this;
         }
 
+        public Builder setIcon(Bitmap icon) {
+            mIcon = icon;
+            return this;
+        }
+
         public DownloadInfo build() {
             return new DownloadInfo(this);
         }
@@ -416,7 +432,8 @@
                     .setIsOffTheRecord(downloadInfo.isOffTheRecord())
                     .setIsOfflinePage(downloadInfo.isOfflinePage())
                     .setState(downloadInfo.state())
-                    .setLastAccessTime(downloadInfo.getLastAccessTime());
+                    .setLastAccessTime(downloadInfo.getLastAccessTime())
+                    .setIcon(downloadInfo.getIcon());
             return builder;
         }
     }
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadNotificationService.java b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadNotificationService.java
index 21af873..e8a636e 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadNotificationService.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadNotificationService.java
@@ -575,7 +575,7 @@
             // Move all regular downloads to pending.  Don't propagate the pause because
             // if native is still working and it triggers an update, then the service will be
             // restarted.
-            notifyDownloadPaused(entry.id, !entry.isOffTheRecord, true, entry.isTransient);
+            notifyDownloadPaused(entry.id, !entry.isOffTheRecord, true, entry.isTransient, null);
         }
     }
 
@@ -734,59 +734,67 @@
 
     /**
      * Adds or updates an in-progress download notification.
-     * @param id The {@link ContentId} of the download.
-     * @param fileName File name of the download.
-     * @param percentage Percentage completed. Value should be between 0 to 100 if
-     *        the percentage can be determined, or -1 if it is unknown.
-     * @param bytesReceived Total number of bytes received.
-     * @param timeRemainingInMillis Remaining download time in milliseconds.
-     * @param startTime Time when download started.
-     * @param isOffTheRecord Whether the download is off the record.
+     * @param id                      The {@link ContentId} of the download.
+     * @param fileName                File name of the download.
+     * @param percentage              Percentage completed. Value should be between 0 to 100 if the
+     *                                percentage can be determined, or -1 if it is unknown.
+     * @param bytesReceived           Total number of bytes received.
+     * @param timeRemainingInMillis   Remaining download time in milliseconds.
+     * @param startTime               Time when download started.
+     * @param isOffTheRecord          Whether the download is off the record.
      * @param canDownloadWhileMetered Whether the download can happen in metered network.
-     * @param isTransient Whether or not clicking on the download should launch downloads home.
+     * @param isTransient             Whether or not clicking on the download should launch
+     *                                downloads home.
+     * @param icon                    A {@link Bitmap} to be used as the large icon for display.
      */
     @VisibleForTesting
     public void notifyDownloadProgress(ContentId id, String fileName, int percentage,
             long bytesReceived, long timeRemainingInMillis, long startTime, boolean isOffTheRecord,
-            boolean canDownloadWhileMetered, boolean isTransient) {
+            boolean canDownloadWhileMetered, boolean isTransient, Bitmap icon) {
         updateActiveDownloadNotification(id, fileName, percentage, bytesReceived,
                 timeRemainingInMillis, startTime, isOffTheRecord, canDownloadWhileMetered, false,
-                isTransient);
+                isTransient, icon);
     }
 
     /**
      * Adds or updates a pending download notification.
-     * @param id The {@link ContentId} of the download.
-     * @param fileName File name of the download.
-     * @param isOffTheRecord Whether the download is off the record.
+     * @param id                      The {@link ContentId} of the download.
+     * @param fileName                File name of the download.
+     * @param isOffTheRecord          Whether the download is off the record.
      * @param canDownloadWhileMetered Whether the download can happen in metered network.
-     * @param isTransient Whether or not clicking on the download should launch downloads home.
+     * @param isTransient             Whether or not clicking on the download should launch
+     *                                downloads home.
+     * @param icon                    A {@link Bitmap} to be used as the large icon for display.
      */
     private void notifyDownloadPending(ContentId id, String fileName, boolean isOffTheRecord,
-            boolean canDownloadWhileMetered, boolean isTransient) {
+            boolean canDownloadWhileMetered, boolean isTransient, Bitmap icon) {
         updateActiveDownloadNotification(id, fileName,
                 DownloadItem.INDETERMINATE_DOWNLOAD_PERCENTAGE, 0, 0, 0, isOffTheRecord,
-                canDownloadWhileMetered, true, isTransient);
+                canDownloadWhileMetered, true, isTransient, icon);
     }
 
     /**
      * Helper method to update the notification for an active download, the download is either in
      * progress or pending.
-     * @param id The {@link ContentId} of the download.
-     * @param fileName File name of the download.
-     * @param percentage Percentage completed. Value should be between 0 to 100 if
-     *        the percentage can be determined, or -1 if it is unknown.
-     * @param bytesReceived Total number of bytes received.
-     * @param timeRemainingInMillis Remaining download time in milliseconds or -1 if it is unknown.
-     * @param startTime Time when download started.
-     * @param isOffTheRecord Whether the download is off the record.
+     * @param id                      The {@link ContentId} of the download.
+     * @param fileName                File name of the download.
+     * @param percentage              Percentage completed. Value should be between 0 to 100 if the
+     *                                percentage can be determined, or -1 if it is unknown.
+     * @param bytesReceived           Total number of bytes received.
+     * @param timeRemainingInMillis   Remaining download time in milliseconds or -1 if it is
+     *                                unknown.
+     * @param startTime               Time when download started.
+     * @param isOffTheRecord          Whether the download is off the record.
      * @param canDownloadWhileMetered Whether the download can happen in metered network.
-     * @param isDownloadPending Whether the download is pending.
-     * @param isTransient Whether or not clicking on the download should launch downloads home.
+     * @param isDownloadPending       Whether the download is pending.
+     * @param isTransient             Whether or not clicking on the download should launch
+     *                                downloads home.
+     * @param icon                    A {@link Bitmap} to be used as the large icon for display.
      */
     private void updateActiveDownloadNotification(ContentId id, String fileName, int percentage,
             long bytesReceived, long timeRemainingInMillis, long startTime, boolean isOffTheRecord,
-            boolean canDownloadWhileMetered, boolean isDownloadPending, boolean isTransient) {
+            boolean canDownloadWhileMetered, boolean isDownloadPending, boolean isTransient,
+            Bitmap icon) {
         boolean indeterminate =
                 (percentage == DownloadItem.INDETERMINATE_DOWNLOAD_PERCENTAGE) || isDownloadPending;
         String contentText = null;
@@ -832,6 +840,7 @@
                     downloadHomeIntent, PendingIntent.FLAG_UPDATE_CURRENT));
         }
         builder.setAutoCancel(false);
+        if (icon != null) builder.setLargeIcon(icon);
 
         Intent pauseIntent = buildActionIntent(mContext, ACTION_DOWNLOAD_PAUSE, id, isOffTheRecord);
         builder.addAction(R.drawable.ic_pause_white_24dp,
@@ -886,18 +895,19 @@
 
     /**
      * Change a download notification to paused state.
-     * @param id The {@link ContentId} of the download.
-     * @param isResumable Whether download can be resumed.
+     * @param id              The {@link ContentId} of the download.
+     * @param isResumable     Whether download can be resumed.
      * @param isAutoResumable whether download is can be resumed automatically.
-     * @param isTransient Whether or not clicking on the download should launch downloads home.
+     * @param isTransient     Whether or not clicking on the download should launch downloads home.
+     * @param icon            A {@link Bitmap} to be used as the large icon for display.
      */
-    public void notifyDownloadPaused(
-            ContentId id, boolean isResumable, boolean isAutoResumable, boolean isTransient) {
+    public void notifyDownloadPaused(ContentId id, boolean isResumable, boolean isAutoResumable,
+            boolean isTransient, Bitmap icon) {
         DownloadSharedPreferenceEntry entry =
                 mDownloadSharedPreferenceHelper.getDownloadSharedPreferenceEntry(id);
         if (entry == null) return;
         if (!isResumable) {
-            notifyDownloadFailed(id, entry.fileName);
+            notifyDownloadFailed(id, entry.fileName, icon);
             return;
         }
         // If download is already paused, do nothing.
@@ -905,7 +915,7 @@
         // If download is interrupted due to network disconnection, show download pending state.
         if (isAutoResumable) {
             notifyDownloadPending(id, entry.fileName, entry.isOffTheRecord,
-                    entry.canDownloadWhileMetered, isTransient);
+                    entry.canDownloadWhileMetered, isTransient, icon);
             stopTrackingInProgressDownload(id, true);
             return;
         }
@@ -923,6 +933,7 @@
                     downloadHomeIntent, PendingIntent.FLAG_UPDATE_CURRENT));
         }
         builder.setAutoCancel(false);
+        if (icon != null) builder.setLargeIcon(icon);
 
         Intent resumeIntent =
                 buildActionIntent(mContext, ACTION_DOWNLOAD_RESUME, id, entry.isOffTheRecord);
@@ -949,19 +960,20 @@
 
     /**
      * Add a download successful notification.
-     * @param id The {@link ContentId} of the download.
-     * @param filePath Full path to the download.
-     * @param fileName Filename of the download.
-     * @param systemDownloadId Download ID assigned by system DownloadManager.
+     * @param id                  The {@link ContentId} of the download.
+     * @param filePath            Full path to the download.
+     * @param fileName            Filename of the download.
+     * @param systemDownloadId    Download ID assigned by system DownloadManager.
      * @param isSupportedMimeType Whether the MIME type can be viewed inside browser.
-     * @param isOpenable Whether or not this download can be opened.
-     * @return ID of the successful download notification. Used for removing the notification when
-     *         user click on the snackbar.
+     * @param isOpenable          Whether or not this download can be opened.
+     * @param icon                A {@link Bitmap} to be used as the large icon for display.
+     * @return                    ID of the successful download notification. Used for removing the
+     *                            notification when user click on the snackbar.
      */
     @VisibleForTesting
     public int notifyDownloadSuccessful(ContentId id, String filePath, String fileName,
             long systemDownloadId, boolean isOffTheRecord, boolean isSupportedMimeType,
-            boolean isOpenable) {
+            boolean isOpenable, Bitmap icon) {
         int notificationId = getNotificationId(id);
         ChromeNotificationBuilder builder = buildNotification(R.drawable.offline_pin, fileName,
                 mContext.getResources().getString(R.string.download_notification_completed));
@@ -988,13 +1000,13 @@
             builder.setContentIntent(PendingIntent.getBroadcast(
                     mContext, notificationId, intent, PendingIntent.FLAG_UPDATE_CURRENT));
         }
-        if (mDownloadSuccessLargeIcon == null) {
+        if (icon == null && mDownloadSuccessLargeIcon == null) {
             Bitmap bitmap = BitmapFactory.decodeResource(
                     mContext.getResources(), R.drawable.offline_pin);
             mDownloadSuccessLargeIcon = getLargeNotificationIcon(bitmap);
         }
         builder.setDeleteIntent(buildSummaryIconIntent(notificationId));
-        builder.setLargeIcon(mDownloadSuccessLargeIcon);
+        builder.setLargeIcon(icon != null ? icon : mDownloadSuccessLargeIcon);
         updateNotification(notificationId, builder.build(), id, null);
         stopTrackingInProgressDownload(id, true);
         return notificationId;
@@ -1002,11 +1014,12 @@
 
     /**
      * Add a download failed notification.
-     * @param id The {@link ContentId} of the download.
+     * @param id       The {@link ContentId} of the download.
      * @param fileName GUID of the download.
+     * @param icon     A {@link Bitmap} to be used as the large icon for display.
      */
     @VisibleForTesting
-    public void notifyDownloadFailed(ContentId id, String fileName) {
+    public void notifyDownloadFailed(ContentId id, String fileName, Bitmap icon) {
         // If the download is not in history db, fileName could be empty. Get it from
         // SharedPreferences.
         if (TextUtils.isEmpty(fileName)) {
@@ -1020,6 +1033,7 @@
         ChromeNotificationBuilder builder =
                 buildNotification(android.R.drawable.stat_sys_download_done, fileName,
                         mContext.getResources().getString(R.string.download_notification_failed));
+        if (icon != null) builder.setLargeIcon(icon);
         builder.setDeleteIntent(buildSummaryIconIntent(notificationId));
         updateNotification(notificationId, builder.build(), id, null);
         stopTrackingInProgressDownload(id, true);
@@ -1152,7 +1166,10 @@
             // If browser process already goes away, the download should have already paused. Do
             // nothing in that case.
             if (!DownloadManagerService.hasDownloadManagerService()) {
-                notifyDownloadPaused(entry.id, !entry.isOffTheRecord, false, entry.isTransient);
+                // TODO(dtrainor): Should we spin up native to make sure we have the icon?  Or maybe
+                // build a Java cache for easy access.
+                notifyDownloadPaused(
+                        entry.id, !entry.isOffTheRecord, false, entry.isTransient, null);
                 hideSummaryNotificationIfNecessary(-1);
                 return;
             }
@@ -1199,11 +1216,15 @@
                             observer.onDownloadCanceled(entry.id);
                         }
                 } else if (ACTION_DOWNLOAD_PAUSE.equals(intent.getAction())) {
-                    notifyDownloadPaused(entry.id, true, false, entry.isTransient);
+                    // TODO(dtrainor): Consider hitting the delegate and rely on that to update the
+                    // state.
+                    notifyDownloadPaused(entry.id, true, false, entry.isTransient, null);
                     downloadServiceDelegate.pauseDownload(entry.id, entry.isOffTheRecord);
                 } else if (ACTION_DOWNLOAD_RESUME.equals(intent.getAction())) {
+                    // TODO(dtrainor): Consider hitting the delegate and rely on that to update the
+                    // state.
                     notifyDownloadPending(entry.id, entry.fileName, entry.isOffTheRecord,
-                            entry.canDownloadWhileMetered, entry.isTransient);
+                            entry.canDownloadWhileMetered, entry.isTransient, null);
                     downloadServiceDelegate.resumeDownload(
                             entry.id, entry.buildDownloadItem(), true);
                 } else if (ACTION_DOWNLOAD_RESUME_ALL.equals(intent.getAction())) {
@@ -1372,7 +1393,7 @@
             if (mDownloadsInProgress.contains(entry.id)) continue;
 
             notifyDownloadPending(entry.id, entry.fileName, false, entry.canDownloadWhileMetered,
-                    entry.isTransient);
+                    entry.isTransient, null);
             DownloadServiceDelegate downloadServiceDelegate = getServiceDelegate(entry.id);
             downloadServiceDelegate.resumeDownload(entry.id, entry.buildDownloadItem(), false);
             downloadServiceDelegate.destroyServiceDelegate();
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/SystemDownloadNotifier.java b/chrome/android/java/src/org/chromium/chrome/browser/download/SystemDownloadNotifier.java
index 8612e0f7..8e9751e 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/download/SystemDownloadNotifier.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/SystemDownloadNotifier.java
@@ -271,25 +271,26 @@
                         info.getPercentCompleted(), info.getBytesReceived(),
                         info.getTimeRemainingInMillis(), notificationInfo.startTime,
                         info.isOffTheRecord(), notificationInfo.canDownloadWhileMetered,
-                        info.getIsTransient());
+                        info.getIsTransient(), info.getIcon());
                 break;
             case DOWNLOAD_NOTIFICATION_TYPE_PAUSE:
                 mBoundService.notifyDownloadPaused(
-                        info.getContentId(), true, false, info.getIsTransient());
+                        info.getContentId(), true, false, info.getIsTransient(), info.getIcon());
                 break;
             case DOWNLOAD_NOTIFICATION_TYPE_INTERRUPT:
                 mBoundService.notifyDownloadPaused(info.getContentId(), info.isResumable(),
-                        notificationInfo.isAutoResumable, info.getIsTransient());
+                        notificationInfo.isAutoResumable, info.getIsTransient(), info.getIcon());
                 break;
             case DOWNLOAD_NOTIFICATION_TYPE_SUCCESS:
                 final int notificationId = mBoundService.notifyDownloadSuccessful(
                         info.getContentId(), info.getFilePath(), info.getFileName(),
                         notificationInfo.systemDownloadId, info.isOffTheRecord(),
-                        notificationInfo.isSupportedMimeType, info.getIsOpenable());
+                        notificationInfo.isSupportedMimeType, info.getIsOpenable(), info.getIcon());
                 onSuccessNotificationShown(notificationInfo, notificationId);
                 break;
             case DOWNLOAD_NOTIFICATION_TYPE_FAILURE:
-                mBoundService.notifyDownloadFailed(info.getContentId(), info.getFileName());
+                mBoundService.notifyDownloadFailed(
+                        info.getContentId(), info.getFileName(), info.getIcon());
                 break;
             case DOWNLOAD_NOTIFICATION_TYPE_CANCEL:
                 mBoundService.notifyDownloadCanceled(info.getContentId());
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/items/OfflineContentAggregatorNotificationBridgeUi.java b/chrome/android/java/src/org/chromium/chrome/browser/download/items/OfflineContentAggregatorNotificationBridgeUi.java
index 23c7124..637a0ff 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/download/items/OfflineContentAggregatorNotificationBridgeUi.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/items/OfflineContentAggregatorNotificationBridgeUi.java
@@ -6,29 +6,51 @@
 
 import org.chromium.chrome.browser.download.DownloadInfo;
 import org.chromium.chrome.browser.download.DownloadItem;
-import org.chromium.chrome.browser.download.DownloadManagerService;
 import org.chromium.chrome.browser.download.DownloadNotifier;
 import org.chromium.chrome.browser.download.DownloadServiceDelegate;
 import org.chromium.components.offline_items_collection.ContentId;
 import org.chromium.components.offline_items_collection.OfflineContentProvider;
 import org.chromium.components.offline_items_collection.OfflineItem;
 import org.chromium.components.offline_items_collection.OfflineItemState;
+import org.chromium.components.offline_items_collection.OfflineItemVisuals;
+import org.chromium.components.offline_items_collection.VisualsCallback;
 
 import java.util.ArrayList;
+import java.util.HashMap;
 
 /**
  * A glue class that bridges the Profile-attached OfflineContentProvider with the
  * download notification code (SystemDownloadNotifier and DownloadServiceDelegate).
  */
 public class OfflineContentAggregatorNotificationBridgeUi
-        implements DownloadServiceDelegate, OfflineContentProvider.Observer {
+        implements DownloadServiceDelegate, OfflineContentProvider.Observer, VisualsCallback {
+    // TODO(dtrainor): Should this just be part of the OfflineContentProvider callback guarantee?
+    private static final OfflineItemVisuals sEmptyOfflineItemVisuals = new OfflineItemVisuals();
+
     private final OfflineContentProvider mProvider;
 
+    private final DownloadNotifier mUi;
+
+    /** Holds a list of {@link OfflineItem} updates that are waiting for visuals. */
+    private final HashMap<ContentId, OfflineItem> mOutstandingRequests = new HashMap<>();
+
+    /**
+     * Holds a list of {@link OfflineItemVisuals} for all {@link OfflineItem}s that are currently in
+     * progress.  Once an {@link OfflineItem} is no longer in progress it will be removed from this
+     * cache.
+     * TODO(dtrainor): Flush this list aggressively if we get onLowMemory/onTrimMemory.
+     * TODO(dtrainor): Add periodic clean up in case something goes wrong with the underlying
+     * downloads.
+     */
+    private final HashMap<ContentId, OfflineItemVisuals> mVisualsCache = new HashMap<>();
+
     /**
      * Creates a new OfflineContentAggregatorNotificationBridgeUi based on {@code provider}.
      */
-    public OfflineContentAggregatorNotificationBridgeUi(OfflineContentProvider provider) {
+    public OfflineContentAggregatorNotificationBridgeUi(
+            OfflineContentProvider provider, DownloadNotifier notifier) {
         mProvider = provider;
+        mUi = notifier;
 
         mProvider.addObserver(this);
     }
@@ -54,21 +76,35 @@
     public void onItemsAdded(ArrayList<OfflineItem> items) {
         for (int i = 0; i < items.size(); i++) {
             OfflineItem item = items.get(i);
-
-            // Only update the UI for new OfflineItems that are in progress or pending.
-            if (item.state == OfflineItemState.IN_PROGRESS
-                    || item.state == OfflineItemState.PENDING) {
-                visuallyUpdateOfflineItem(item);
-            }
+            if (shouldPushNewItemToUi(item)) getVisualsAndUpdateItem(item);
         }
     }
 
     @Override
-    public void onItemRemoved(ContentId id) {}
+    public void onItemRemoved(ContentId id) {
+        mOutstandingRequests.remove(id);
+        mVisualsCache.remove(id);
+        mUi.notifyDownloadCanceled(id);
+    }
 
     @Override
     public void onItemUpdated(OfflineItem item) {
-        visuallyUpdateOfflineItem(item);
+        // Assume that any item sending updates should have them reflected in the UI.
+        getVisualsAndUpdateItem(item);
+    }
+
+    // OfflineContentProvider.VisualsCallback implementation.
+    @Override
+    public void onVisualsAvailable(ContentId id, OfflineItemVisuals visuals) {
+        OfflineItem item = mOutstandingRequests.remove(id);
+        if (item == null) return;
+
+        if (visuals == null) visuals = sEmptyOfflineItemVisuals;
+
+        // Only cache the visuals if the update we are about to push is interesting and we think we
+        // will need them in the future.
+        if (shouldCacheVisuals(item)) mVisualsCache.put(id, visuals);
+        pushItemToUi(item, visuals);
     }
 
     // DownloadServiceDelegate implementation.
@@ -90,34 +126,101 @@
     @Override
     public void destroyServiceDelegate() {}
 
-    /**
-     * Calls into the proper {@link DownloadNotifier} by converting an {@link OfflineItem} to a
-     * {@link DownloadInfo}.
-     * @param item The {@link OfflineItem} that needs a UI refresh.
-     */
-    private void visuallyUpdateOfflineItem(OfflineItem item) {
-        DownloadInfo info = DownloadInfo.fromOfflineItem(item);
-        DownloadNotifier notifier =
-                DownloadManagerService.getDownloadManagerService().getDownloadNotifier();
+    private void getVisualsAndUpdateItem(OfflineItem item) {
+        if (needsVisualsForUi(item)) {
+            if (!mVisualsCache.containsKey(item.id)) {
+                // We don't have any visuals for this item yet.  Stash the current OfflineItem and,
+                // if we haven't already, queue up a request for the visuals.
+                // TODO(dtrainor): Check if this delay is too much.  If so, just send the update
+                // through and we can push a new notification when the visuals arrive.
+                boolean requestVisuals = !mOutstandingRequests.containsKey(item.id);
+                mOutstandingRequests.put(item.id, item);
+                if (requestVisuals) mProvider.getVisualsForItem(item.id, this);
+                return;
+            }
+        } else {
+            // We don't need the visuals to show this item at this point.  Cancel any requests.
+            mOutstandingRequests.remove(item.id);
+            mVisualsCache.remove(item.id);
+        }
+
+        pushItemToUi(item, mVisualsCache.get(item.id));
+        // We will no longer be needing the visuals for this item after this notification.
+        if (!shouldCacheVisuals(item)) mVisualsCache.remove(item.id);
+    }
+
+    private void pushItemToUi(OfflineItem item, OfflineItemVisuals visuals) {
+        DownloadInfo info = DownloadInfo.fromOfflineItem(item, visuals);
         switch (item.state) {
             case OfflineItemState.IN_PROGRESS:
-                notifier.notifyDownloadProgress(info, item.creationTimeMs, item.allowMetered);
+                mUi.notifyDownloadProgress(info, item.creationTimeMs, item.allowMetered);
                 break;
             case OfflineItemState.COMPLETE:
-                notifier.notifyDownloadSuccessful(info, -1L, false, false);
+                mUi.notifyDownloadSuccessful(info, -1L, false, false);
                 break;
             case OfflineItemState.CANCELLED:
-                notifier.notifyDownloadCanceled(item.id);
+                mUi.notifyDownloadCanceled(item.id);
                 break;
             case OfflineItemState.INTERRUPTED:
                 // TODO(dtrainor): Push the correct value for auto resume.
-                notifier.notifyDownloadInterrupted(info, true);
+                mUi.notifyDownloadInterrupted(info, true);
                 break;
             case OfflineItemState.PAUSED:
-                notifier.notifyDownloadPaused(info);
+                mUi.notifyDownloadPaused(info);
+                break;
+            case OfflineItemState.FAILED:
+                mUi.notifyDownloadFailed(info);
+                break;
+            case OfflineItemState.PENDING:
+                // Not Implemented.
                 break;
             default:
-                assert false;
+                assert false : "Unexpected OfflineItem state.";
+        }
+    }
+
+    private boolean needsVisualsForUi(OfflineItem item) {
+        switch (item.state) {
+            case OfflineItemState.IN_PROGRESS:
+            case OfflineItemState.PENDING:
+            case OfflineItemState.COMPLETE:
+            case OfflineItemState.INTERRUPTED:
+            case OfflineItemState.FAILED:
+            case OfflineItemState.PAUSED:
+                return true;
+            case OfflineItemState.CANCELLED:
+            default:
+                return false;
+        }
+    }
+
+    private boolean shouldPushNewItemToUi(OfflineItem item) {
+        switch (item.state) {
+            case OfflineItemState.IN_PROGRESS:
+                return true;
+            case OfflineItemState.PENDING:
+            case OfflineItemState.COMPLETE:
+            case OfflineItemState.INTERRUPTED:
+            case OfflineItemState.FAILED:
+            case OfflineItemState.PAUSED:
+            case OfflineItemState.CANCELLED:
+            default:
+                return false;
+        }
+    }
+
+    private boolean shouldCacheVisuals(OfflineItem item) {
+        switch (item.state) {
+            case OfflineItemState.IN_PROGRESS:
+            case OfflineItemState.PENDING:
+            case OfflineItemState.INTERRUPTED:
+            case OfflineItemState.PAUSED:
+                return true;
+            case OfflineItemState.FAILED:
+            case OfflineItemState.COMPLETE:
+            case OfflineItemState.CANCELLED:
+            default:
+                return false;
         }
     }
 }
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/items/OfflineContentAggregatorNotificationBridgeUiFactory.java b/chrome/android/java/src/org/chromium/chrome/browser/download/items/OfflineContentAggregatorNotificationBridgeUiFactory.java
index c8bf22f..aaf7d86 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/download/items/OfflineContentAggregatorNotificationBridgeUiFactory.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/items/OfflineContentAggregatorNotificationBridgeUiFactory.java
@@ -5,6 +5,8 @@
 package org.chromium.chrome.browser.download.items;
 
 import org.chromium.base.ThreadUtils;
+import org.chromium.chrome.browser.download.DownloadManagerService;
+import org.chromium.chrome.browser.download.DownloadNotifier;
 import org.chromium.chrome.browser.profiles.Profile;
 import org.chromium.components.offline_items_collection.OfflineContentProvider;
 
@@ -24,8 +26,10 @@
         if (sBridgeUi == null) {
             Profile profile = Profile.getLastUsedProfile();
             OfflineContentProvider provider = OfflineContentAggregatorFactory.forProfile(profile);
+            DownloadNotifier ui =
+                    DownloadManagerService.getDownloadManagerService().getDownloadNotifier();
 
-            sBridgeUi = new OfflineContentAggregatorNotificationBridgeUi(provider);
+            sBridgeUi = new OfflineContentAggregatorNotificationBridgeUi(provider, ui);
         }
 
         return sBridgeUi;
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
index 060df42bb..0775f97 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
@@ -88,6 +88,7 @@
 import org.chromium.components.dom_distiller.core.DomDistillerUrlUtils;
 import org.chromium.components.navigation_interception.InterceptNavigationDelegate;
 import org.chromium.components.security_state.ConnectionSecurityLevel;
+import org.chromium.components.sync.SyncConstants;
 import org.chromium.content.browser.ChildProcessLauncher;
 import org.chromium.content.browser.ContentView;
 import org.chromium.content.browser.ContentViewCore;
@@ -176,7 +177,7 @@
     private SwipeRefreshHandler mSwipeRefreshHandler;
 
     /** The sync id of the Tab if session sync is enabled. */
-    private int mSyncId;
+    private int mSyncId = SyncConstants.INVALID_TAB_NODE_ID;
 
     /** {@link ContentViewCore} showing the current page, or {@code null} if the tab is frozen. */
     private ContentViewCore mContentViewCore;
diff --git a/chrome/android/java_sources.gni b/chrome/android/java_sources.gni
index 4115e74..dd854d7 100644
--- a/chrome/android/java_sources.gni
+++ b/chrome/android/java_sources.gni
@@ -1630,6 +1630,7 @@
   "junit/src/org/chromium/chrome/browser/cookies/CanonicalCookieTest.java",
   "junit/src/org/chromium/chrome/browser/crash/LogcatExtractionRunnableUnitTest.java",
   "junit/src/org/chromium/chrome/browser/download/DownloadSharedPreferenceEntryTest.java",
+  "junit/src/org/chromium/chrome/browser/download/items/OfflineContentAggregatorNotificationBridgeUiTest.java",
   "junit/src/org/chromium/chrome/browser/externalauth/ExternalAuthUtilsTest.java",
   "junit/src/org/chromium/chrome/browser/firstrun/FirstRunFlowSequencerTest.java",
   "junit/src/org/chromium/chrome/browser/fullscreen/BrowserStateBrowserControlsVisibilityDelegateTest.java",
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/download/DownloadNotificationServiceTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/download/DownloadNotificationServiceTest.java
index 02b45c9..85650cb 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/download/DownloadNotificationServiceTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/download/DownloadNotificationServiceTest.java
@@ -296,7 +296,7 @@
 
         DownloadNotificationService service = bindNotificationService();
         ContentId id3 = LegacyHelpers.buildLegacyContentId(false, UUID.randomUUID().toString());
-        service.notifyDownloadProgress(id3, "test", 1, 100L, 1L, 1L, true, true, false);
+        service.notifyDownloadProgress(id3, "test", 1, 100L, 1L, 1L, true, true, false, null);
         assertEquals(3, getService().getNotificationIds().size());
         int lastNotificationId = getService().getLastAddedNotificationId();
         Set<String> entries = DownloadManagerService.getStoredDownloadInfo(
@@ -305,13 +305,13 @@
 
         ContentId id1 = LegacyHelpers.buildLegacyContentId(false, guid1);
         service.notifyDownloadSuccessful(
-                id1, "/path/to/success", "success", 100L, false, false, true);
+                id1, "/path/to/success", "success", 100L, false, false, true, null);
         entries = DownloadManagerService.getStoredDownloadInfo(
                 sharedPrefs, DownloadSharedPreferenceHelper.KEY_PENDING_DOWNLOAD_NOTIFICATIONS);
         assertEquals(2, entries.size());
 
         ContentId id2 = LegacyHelpers.buildLegacyContentId(false, guid2);
-        service.notifyDownloadFailed(id2, "failed");
+        service.notifyDownloadFailed(id2, "failed", null);
         entries = DownloadManagerService.getStoredDownloadInfo(
                 sharedPrefs, DownloadSharedPreferenceHelper.KEY_PENDING_DOWNLOAD_NOTIFICATIONS);
         assertEquals(1, entries.size());
@@ -322,7 +322,7 @@
 
         ContentId id4 = LegacyHelpers.buildLegacyContentId(false, UUID.randomUUID().toString());
         service.notifyDownloadSuccessful(
-                id4, "/path/to/success", "success", 100L, false, false, true);
+                id4, "/path/to/success", "success", 100L, false, false, true, null);
         assertEquals(3, getService().getNotificationIds().size());
         int nextNotificationId = getService().getLastAddedNotificationId();
         service.cancelNotification(nextNotificationId, id4);
@@ -341,7 +341,8 @@
         startNotificationService();
         DownloadNotificationService service = bindNotificationService();
         ContentId id = LegacyHelpers.buildLegacyContentId(false, UUID.randomUUID().toString());
-        service.notifyDownloadSuccessful(id, "/path/to/test", "test", 100L, false, false, true);
+        service.notifyDownloadSuccessful(
+                id, "/path/to/test", "test", 100L, false, false, true, null);
         assertEquals(1, getService().getNotificationIds().size());
     }
 
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/download/MockDownloadNotificationService.java b/chrome/android/javatests/src/org/chromium/chrome/browser/download/MockDownloadNotificationService.java
index 0b260ae5..43e4e9f0 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/download/MockDownloadNotificationService.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/download/MockDownloadNotificationService.java
@@ -6,6 +6,7 @@
 
 import android.app.Notification;
 import android.content.Context;
+import android.graphics.Bitmap;
 import android.util.Pair;
 
 import org.chromium.base.ThreadUtils;
@@ -96,13 +97,13 @@
     @Override
     public int notifyDownloadSuccessful(final ContentId id, final String filePath,
             final String fileName, final long systemDownloadId, final boolean isOffTheRecord,
-            final boolean isSupportedMimeType, final boolean isOpenable) {
+            final boolean isSupportedMimeType, final boolean isOpenable, final Bitmap icon) {
         return ThreadUtils.runOnUiThreadBlockingNoException(new Callable<Integer>() {
             @Override
             public Integer call() throws Exception {
                 return MockDownloadNotificationService.super.notifyDownloadSuccessful(id, filePath,
-                        fileName, systemDownloadId, isOffTheRecord, isSupportedMimeType,
-                        isOpenable);
+                        fileName, systemDownloadId, isOffTheRecord, isSupportedMimeType, isOpenable,
+                        icon);
             }
         });
     }
@@ -111,23 +112,23 @@
     public void notifyDownloadProgress(final ContentId id, final String fileName,
             final int percentage, final long bytesReceived, final long timeRemainingInMillis,
             final long startTime, final boolean isOffTheRecord,
-            final boolean canDownloadWhileMetered, final boolean isTransient) {
+            final boolean canDownloadWhileMetered, final boolean isTransient, final Bitmap icon) {
         ThreadUtils.runOnUiThreadBlocking(new Runnable() {
             @Override
             public void run() {
                 MockDownloadNotificationService.super.notifyDownloadProgress(id, fileName,
                         percentage, bytesReceived, timeRemainingInMillis, startTime, isOffTheRecord,
-                        canDownloadWhileMetered, isTransient);
+                        canDownloadWhileMetered, isTransient, icon);
             }
         });
     }
 
     @Override
-    public void notifyDownloadFailed(final ContentId id, final String fileName) {
+    public void notifyDownloadFailed(final ContentId id, final String fileName, final Bitmap icon) {
         ThreadUtils.runOnUiThreadBlocking(new Runnable() {
             @Override
             public void run() {
-                MockDownloadNotificationService.super.notifyDownloadFailed(id, fileName);
+                MockDownloadNotificationService.super.notifyDownloadFailed(id, fileName, icon);
             }
         });
     }
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/download/items/OfflineContentAggregatorNotificationBridgeUiTest.java b/chrome/android/junit/src/org/chromium/chrome/browser/download/items/OfflineContentAggregatorNotificationBridgeUiTest.java
new file mode 100644
index 0000000..2947237
--- /dev/null
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/download/items/OfflineContentAggregatorNotificationBridgeUiTest.java
@@ -0,0 +1,334 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.download.items;
+
+import static org.mockito.ArgumentMatchers.argThat;
+import static org.mockito.Mockito.inOrder;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+import android.graphics.Bitmap;
+
+import org.junit.Assert;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.ArgumentMatcher;
+import org.mockito.ArgumentMatchers;
+import org.mockito.InOrder;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnit;
+import org.mockito.junit.MockitoRule;
+import org.robolectric.annotation.Config;
+
+import org.chromium.chrome.browser.download.DownloadInfo;
+import org.chromium.chrome.browser.download.DownloadNotifier;
+import org.chromium.components.offline_items_collection.ContentId;
+import org.chromium.components.offline_items_collection.OfflineContentProvider;
+import org.chromium.components.offline_items_collection.OfflineItem;
+import org.chromium.components.offline_items_collection.OfflineItemState;
+import org.chromium.components.offline_items_collection.OfflineItemVisuals;
+import org.chromium.testing.local.LocalRobolectricTestRunner;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Unit tests for {@link OfflineContentAggregatorNotifierBridgeUi}.  Validate that it interacts with
+ * both the {@link DownloadNotifier} and the {@link OfflineContentProvider} in expected ways.
+ */
+@RunWith(LocalRobolectricTestRunner.class)
+@Config(manifest = Config.NONE)
+public class OfflineContentAggregatorNotificationBridgeUiTest {
+    /** Helper class to validate that a DownloadInfo has the right ContentId. */
+    static class DownloadInfoIdMatcher implements ArgumentMatcher<DownloadInfo> {
+        private final ContentId mExpectedId;
+
+        public DownloadInfoIdMatcher(ContentId expected) {
+            mExpectedId = expected;
+        }
+
+        @Override
+        public boolean matches(DownloadInfo argument) {
+            return ((DownloadInfo) argument).getContentId().equals(mExpectedId);
+        }
+
+        @Override
+        public String toString() {
+            return mExpectedId == null ? null : mExpectedId.toString();
+        }
+    }
+
+    @Mock
+    private OfflineContentProvider mProvider;
+
+    @Mock
+    private DownloadNotifier mNotifier;
+
+    @Rule
+    public MockitoRule mMockitoRule = MockitoJUnit.rule();
+
+    private static OfflineItem buildOfflineItem(ContentId id, @OfflineItemState int state) {
+        OfflineItem item = new OfflineItem();
+        item.id = id;
+        item.state = state;
+        return item;
+    }
+
+    @Test
+    public void testOnlyInterestingNewItemsGetSentToTheUi() {
+        OfflineContentAggregatorNotificationBridgeUi bridge =
+                new OfflineContentAggregatorNotificationBridgeUi(mProvider, mNotifier);
+        verify(mProvider, times(1)).addObserver(bridge);
+
+        ArrayList<OfflineItem> items = new ArrayList<OfflineItem>() {
+            {
+                add(buildOfflineItem(new ContentId("1", "A"), OfflineItemState.IN_PROGRESS));
+                add(buildOfflineItem(new ContentId("2", "B"), OfflineItemState.PENDING));
+                add(buildOfflineItem(new ContentId("3", "C"), OfflineItemState.COMPLETE));
+                add(buildOfflineItem(new ContentId("4", "D"), OfflineItemState.CANCELLED));
+                add(buildOfflineItem(new ContentId("5", "E"), OfflineItemState.INTERRUPTED));
+                add(buildOfflineItem(new ContentId("6", "F"), OfflineItemState.FAILED));
+                add(buildOfflineItem(new ContentId("7", "G"), OfflineItemState.PAUSED));
+            }
+        };
+
+        bridge.onItemsAvailable();
+        bridge.onItemsAdded(items);
+
+        InOrder order = inOrder(mProvider);
+        order.verify(mProvider, times(1))
+                .getVisualsForItem(items.get(0).id /* OfflineItemState.IN_PROGRESS */, bridge);
+        order.verify(mProvider, never())
+                .getVisualsForItem(ArgumentMatchers.any(), ArgumentMatchers.any());
+
+        bridge.onVisualsAvailable(items.get(0).id, new OfflineItemVisuals());
+
+        verify(mNotifier, times(1))
+                .notifyDownloadProgress(argThat(new DownloadInfoIdMatcher(items.get(0).id)),
+                        ArgumentMatchers.anyLong(), ArgumentMatchers.anyBoolean());
+
+        bridge.destroy();
+        verify(mProvider, times(1)).removeObserver(bridge);
+    }
+
+    @Test
+    public void testItemUpdatesGetSentToTheUi() {
+        OfflineContentAggregatorNotificationBridgeUi bridge =
+                new OfflineContentAggregatorNotificationBridgeUi(mProvider, mNotifier);
+        verify(mProvider, times(1)).addObserver(bridge);
+
+        ArrayList<OfflineItem> items = new ArrayList<OfflineItem>() {
+            {
+                add(buildOfflineItem(new ContentId("1", "A"), OfflineItemState.IN_PROGRESS));
+                add(buildOfflineItem(new ContentId("2", "B"), OfflineItemState.PENDING));
+                add(buildOfflineItem(new ContentId("3", "C"), OfflineItemState.COMPLETE));
+                add(buildOfflineItem(new ContentId("4", "D"), OfflineItemState.CANCELLED));
+                add(buildOfflineItem(new ContentId("5", "E"), OfflineItemState.INTERRUPTED));
+                add(buildOfflineItem(new ContentId("6", "F"), OfflineItemState.FAILED));
+                add(buildOfflineItem(new ContentId("7", "G"), OfflineItemState.PAUSED));
+            }
+        };
+
+        bridge.onItemsAvailable();
+        for (int i = 0; i < items.size(); i++) bridge.onItemUpdated(items.get(i));
+
+        verify(mProvider, times(1)).getVisualsForItem(items.get(0).id, bridge);
+        verify(mProvider, times(1)).getVisualsForItem(items.get(1).id, bridge);
+        verify(mProvider, times(1)).getVisualsForItem(items.get(2).id, bridge);
+        verify(mProvider, never()).getVisualsForItem(items.get(3).id, bridge);
+        verify(mProvider, times(1)).getVisualsForItem(items.get(4).id, bridge);
+        verify(mProvider, times(1)).getVisualsForItem(items.get(5).id, bridge);
+        verify(mProvider, times(1)).getVisualsForItem(items.get(6).id, bridge);
+
+        for (int i = 0; i < items.size(); i++) {
+            bridge.onVisualsAvailable(items.get(i).id, new OfflineItemVisuals());
+        }
+
+        verify(mNotifier, times(1))
+                .notifyDownloadProgress(argThat(new DownloadInfoIdMatcher(items.get(0).id)),
+                        ArgumentMatchers.anyLong(), ArgumentMatchers.anyBoolean());
+        verify(mNotifier, times(1))
+                .notifyDownloadSuccessful(argThat(new DownloadInfoIdMatcher(items.get(2).id)),
+                        ArgumentMatchers.anyLong(), ArgumentMatchers.anyBoolean(),
+                        ArgumentMatchers.anyBoolean());
+        verify(mNotifier, times(1))
+                .notifyDownloadCanceled(items.get(3).id /* OfflineItemState.CANCELLED */);
+        verify(mNotifier, times(1))
+                .notifyDownloadInterrupted(argThat(new DownloadInfoIdMatcher(items.get(4).id)),
+                        ArgumentMatchers.anyBoolean());
+        verify(mNotifier, times(1))
+                .notifyDownloadFailed(argThat(new DownloadInfoIdMatcher(items.get(5).id)));
+        verify(mNotifier, times(1))
+                .notifyDownloadPaused(argThat(new DownloadInfoIdMatcher(items.get(6).id)));
+
+        bridge.destroy();
+        verify(mProvider, times(1)).removeObserver(bridge);
+    }
+
+    @Test
+    public void testNullVisuals() {
+        OfflineContentAggregatorNotificationBridgeUi bridge =
+                new OfflineContentAggregatorNotificationBridgeUi(mProvider, mNotifier);
+        verify(mProvider, times(1)).addObserver(bridge);
+
+        OfflineItem item1 = buildOfflineItem(new ContentId("1", "A"), OfflineItemState.IN_PROGRESS);
+        OfflineItem item2 = buildOfflineItem(new ContentId("2", "B"), OfflineItemState.IN_PROGRESS);
+
+        OfflineItemVisuals visuals1 = new OfflineItemVisuals();
+        visuals1.icon = Bitmap.createBitmap(1, 1, Bitmap.Config.ALPHA_8);
+
+        bridge.onItemsAvailable();
+        bridge.onItemUpdated(item1);
+        bridge.onItemUpdated(item2);
+
+        verify(mProvider, times(1)).getVisualsForItem(item1.id, bridge);
+        verify(mProvider, times(1)).getVisualsForItem(item2.id, bridge);
+
+        ArgumentCaptor<DownloadInfo> captor = ArgumentCaptor.forClass(DownloadInfo.class);
+
+        bridge.onVisualsAvailable(item1.id, visuals1);
+        bridge.onVisualsAvailable(item2.id, null);
+        verify(mNotifier, times(2))
+                .notifyDownloadProgress(captor.capture(), ArgumentMatchers.anyLong(),
+                        ArgumentMatchers.anyBoolean());
+
+        List<DownloadInfo> capturedInfo = captor.getAllValues();
+        Assert.assertEquals(item1.id, capturedInfo.get(0).getContentId());
+        Assert.assertEquals(visuals1.icon, capturedInfo.get(0).getIcon());
+        Assert.assertEquals(item2.id, capturedInfo.get(1).getContentId());
+        Assert.assertEquals(null, capturedInfo.get(1).getIcon());
+
+        bridge.destroy();
+        verify(mProvider, times(1)).removeObserver(bridge);
+    }
+
+    @Test
+    public void testRemovedItemsGetRemovedFromTheUi() {
+        OfflineContentAggregatorNotificationBridgeUi bridge =
+                new OfflineContentAggregatorNotificationBridgeUi(mProvider, mNotifier);
+        verify(mProvider, times(1)).addObserver(bridge);
+
+        ContentId id = new ContentId("1", "A");
+
+        bridge.onItemsAvailable();
+        bridge.onItemRemoved(id);
+        verify(mNotifier, times(1)).notifyDownloadCanceled(id);
+
+        bridge.destroy();
+        verify(mProvider, times(1)).removeObserver(bridge);
+    }
+
+    @Test
+    public void testRemovedItemsIgnoreVisualsCallback() {
+        OfflineContentAggregatorNotificationBridgeUi bridge =
+                new OfflineContentAggregatorNotificationBridgeUi(mProvider, mNotifier);
+        verify(mProvider, times(1)).addObserver(bridge);
+
+        OfflineItem item = buildOfflineItem(new ContentId("1", "A"), OfflineItemState.IN_PROGRESS);
+
+        bridge.onItemsAvailable();
+        bridge.onItemUpdated(item);
+        verify(mProvider, times(1)).getVisualsForItem(item.id, bridge);
+
+        bridge.onItemRemoved(item.id);
+        bridge.onVisualsAvailable(item.id, new OfflineItemVisuals());
+        InOrder order = inOrder(mNotifier);
+        order.verify(mNotifier, times(1)).notifyDownloadCanceled(item.id);
+        order.verifyNoMoreInteractions();
+
+        bridge.destroy();
+        verify(mProvider, times(1)).removeObserver(bridge);
+    }
+
+    @Test
+    public void testOnlyRequestsVisualsOnceForMultipleUpdates() {
+        OfflineContentAggregatorNotificationBridgeUi bridge =
+                new OfflineContentAggregatorNotificationBridgeUi(mProvider, mNotifier);
+        verify(mProvider, times(1)).addObserver(bridge);
+
+        OfflineItem item = buildOfflineItem(new ContentId("1", "A"), OfflineItemState.IN_PROGRESS);
+
+        bridge.onItemsAvailable();
+        bridge.onItemUpdated(item);
+        bridge.onItemUpdated(item);
+        verify(mProvider, times(1)).getVisualsForItem(item.id, bridge);
+
+        bridge.destroy();
+        verify(mProvider, times(1)).removeObserver(bridge);
+    }
+
+    @Test
+    public void testVisualsAreCachedForInterestingItems() {
+        OfflineContentAggregatorNotificationBridgeUi bridge =
+                new OfflineContentAggregatorNotificationBridgeUi(mProvider, mNotifier);
+        verify(mProvider, times(1)).addObserver(bridge);
+
+        ArrayList<OfflineItem> interestingItems = new ArrayList<OfflineItem>() {
+            {
+                add(buildOfflineItem(new ContentId("1", "A"), OfflineItemState.IN_PROGRESS));
+                add(buildOfflineItem(new ContentId("2", "B"), OfflineItemState.PENDING));
+                add(buildOfflineItem(new ContentId("5", "E"), OfflineItemState.INTERRUPTED));
+                add(buildOfflineItem(new ContentId("7", "G"), OfflineItemState.PAUSED));
+            }
+        };
+
+        ArrayList<OfflineItem> uninterestingItems = new ArrayList<OfflineItem>() {
+            {
+                add(buildOfflineItem(new ContentId("3", "C"), OfflineItemState.COMPLETE));
+                add(buildOfflineItem(new ContentId("6", "F"), OfflineItemState.FAILED));
+            }
+        };
+
+        bridge.onItemsAvailable();
+
+        for (int i = 0; i < interestingItems.size(); i++) {
+            OfflineItem item = interestingItems.get(i);
+            bridge.onItemUpdated(item);
+            bridge.onVisualsAvailable(item.id, null);
+            bridge.onItemUpdated(item);
+            verify(mProvider, times(1)).getVisualsForItem(item.id, bridge);
+            verify(mNotifier, times(2))
+                    .notifyDownloadProgress(ArgumentMatchers.any(), ArgumentMatchers.anyLong(),
+                            ArgumentMatchers.anyBoolean());
+        }
+
+        for (int i = 0; i < uninterestingItems.size(); i++) {
+            OfflineItem item = uninterestingItems.get(i);
+            bridge.onItemUpdated(item);
+            bridge.onVisualsAvailable(item.id, null);
+            bridge.onItemUpdated(item);
+            verify(mProvider, times(2)).getVisualsForItem(item.id, bridge);
+        }
+
+        bridge.destroy();
+        verify(mProvider, times(1)).removeObserver(bridge);
+    }
+
+    @Test
+    public void testVisualsGetClearedForUninterestingItems() {
+        OfflineContentAggregatorNotificationBridgeUi bridge =
+                new OfflineContentAggregatorNotificationBridgeUi(mProvider, mNotifier);
+        verify(mProvider, times(1)).addObserver(bridge);
+
+        ContentId id = new ContentId("1", "A");
+        OfflineItem item1 = buildOfflineItem(id, OfflineItemState.IN_PROGRESS);
+        OfflineItem item2 = buildOfflineItem(id, OfflineItemState.FAILED);
+        OfflineItem item3 = buildOfflineItem(id, OfflineItemState.IN_PROGRESS);
+
+        bridge.onItemsAvailable();
+        bridge.onItemUpdated(item1);
+        bridge.onVisualsAvailable(item1.id, new OfflineItemVisuals());
+        bridge.onItemUpdated(item2);
+        bridge.onItemUpdated(item3);
+        bridge.onVisualsAvailable(item1.id, new OfflineItemVisuals());
+        verify(mProvider, times(2)).getVisualsForItem(id, bridge);
+
+        bridge.destroy();
+        verify(mProvider, times(1)).removeObserver(bridge);
+    }
+}
diff --git a/chrome/app/settings_strings.grdp b/chrome/app/settings_strings.grdp
index 39b7e244..3e3444d 100644
--- a/chrome/app/settings_strings.grdp
+++ b/chrome/app/settings_strings.grdp
@@ -164,8 +164,8 @@
     <message name="IDS_SETTINGS_LARGE_MOUSE_CURSOR_SIZE_LABEL" desc="Label for a slider which changes the size of large mouse cursor.">
       Adjust cursor size
     </message>
-    <message name="IDS_SETTINGS_LARGE_MOUSE_CURSOR_SIZE_SMALL_LABEL" desc="Label in the slider which indicates that this side makes the cursor small.">
-      Small
+    <message name="IDS_SETTINGS_LARGE_MOUSE_CURSOR_SIZE_DEFAULT_LABEL" desc="Label in the slider which indicates that this side makes the cursor to its default size.">
+      Default
     </message>
     <message name="IDS_SETTINGS_LARGE_MOUSE_CURSOR_SIZE_LARGE_LABEL" desc="Label in the slider which indicates that this side makes the cursor large.">
       Large
diff --git a/chrome/browser/extensions/api/bookmark_manager_private/bookmark_manager_private_api.cc b/chrome/browser/extensions/api/bookmark_manager_private/bookmark_manager_private_api.cc
index 94cd27a9..584d9af 100644
--- a/chrome/browser/extensions/api/bookmark_manager_private/bookmark_manager_private_api.cc
+++ b/chrome/browser/extensions/api/bookmark_manager_private/bookmark_manager_private_api.cc
@@ -796,12 +796,6 @@
   return true;
 }
 
-bool BookmarkManagerPrivateCanOpenNewWindowsFunction::RunOnReady() {
-  bool can_open_new_windows = true;
-  SetResult(base::MakeUnique<base::Value>(can_open_new_windows));
-  return true;
-}
-
 bool BookmarkManagerPrivateRemoveTreesFunction::RunOnReady() {
   if (!EditBookmarksEnabled())
     return false;
diff --git a/chrome/browser/extensions/api/bookmark_manager_private/bookmark_manager_private_api.h b/chrome/browser/extensions/api/bookmark_manager_private/bookmark_manager_private_api.h
index c67a854..35aedc68 100644
--- a/chrome/browser/extensions/api/bookmark_manager_private/bookmark_manager_private_api.h
+++ b/chrome/browser/extensions/api/bookmark_manager_private/bookmark_manager_private_api.h
@@ -330,19 +330,6 @@
   bool RunOnReady() override;
 };
 
-class BookmarkManagerPrivateCanOpenNewWindowsFunction
-    : public extensions::BookmarksFunction {
- public:
-  DECLARE_EXTENSION_FUNCTION("bookmarkManagerPrivate.canOpenNewWindows",
-                             BOOKMARKMANAGERPRIVATE_CANOPENNEWWINDOWS)
-
- protected:
-  ~BookmarkManagerPrivateCanOpenNewWindowsFunction() override {}
-
-  // ExtensionFunction:
-  bool RunOnReady() override;
-};
-
 class BookmarkManagerPrivateRemoveTreesFunction
     : public extensions::BookmarksFunction {
  public:
diff --git a/chrome/browser/media/router/media_router.h b/chrome/browser/media/router/media_router.h
index 570a439..d727876 100644
--- a/chrome/browser/media/router/media_router.h
+++ b/chrome/browser/media/router/media_router.h
@@ -33,6 +33,7 @@
 namespace media_router {
 
 class IssuesObserver;
+class MediaRouteController;
 class MediaRoutesObserver;
 class MediaSinksObserver;
 class PresentationConnectionStateObserver;
@@ -196,9 +197,15 @@
   // there is a change to the media routes, subclass MediaRoutesObserver.
   virtual std::vector<MediaRoute> GetCurrentRoutes() const = 0;
 
+  // Returns a controller for sending media commands to a route. Returns a
+  // nullptr if no MediaRoute exists for the given |route_id|.
+  virtual scoped_refptr<MediaRouteController> GetRouteController(
+      const MediaRoute::Id& route_id) = 0;
+
  private:
   friend class IssuesObserver;
   friend class MediaSinksObserver;
+  friend class MediaRouteController;
   friend class MediaRoutesObserver;
   friend class PresentationConnectionStateObserver;
   friend class RouteMessageObserver;
@@ -254,6 +261,12 @@
   // stop receiving further updates.
   virtual void UnregisterRouteMessageObserver(
       RouteMessageObserver* observer) = 0;
+
+  // Removes the MediaRouteController for |route_id| from the list of
+  // controllers held by |this|. Called by MediaRouteController when it is
+  // invalidated.
+  virtual void DetachRouteController(const MediaRoute::Id& route_id,
+                                     MediaRouteController* controller) = 0;
 };
 
 }  // namespace media_router
diff --git a/chrome/browser/media/router/media_router_base.cc b/chrome/browser/media/router/media_router_base.cc
index 923afc4..d3ec5e6 100644
--- a/chrome/browser/media/router/media_router_base.cc
+++ b/chrome/browser/media/router/media_router_base.cc
@@ -9,6 +9,7 @@
 #include "base/memory/ptr_util.h"
 #include "base/stl_util.h"
 #include "chrome/browser/chrome_notification_types.h"
+#include "chrome/browser/media/router/mojo/media_route_controller.h"
 #include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/browser_thread.h"
 
@@ -76,6 +77,11 @@
   return internal_routes_observer_->current_routes;
 }
 
+scoped_refptr<MediaRouteController> MediaRouterBase::GetRouteController(
+    const MediaRoute::Id& route_id) {
+  return nullptr;
+}
+
 MediaRouterBase::MediaRouterBase() : initialized_(false) {}
 
 // static
@@ -115,6 +121,14 @@
   return internal_routes_observer_->has_route;
 }
 
+bool MediaRouterBase::IsRouteKnown(const std::string& route_id) const {
+  const auto& routes = internal_routes_observer_->current_routes;
+  return std::find_if(routes.begin(), routes.end(),
+                      [&route_id](const MediaRoute& route) {
+                        return route.media_route_id() == route_id;
+                      }) != routes.end();
+}
+
 void MediaRouterBase::Initialize() {
   DCHECK(!initialized_);
   // The observer calls virtual methods on MediaRouter; it must be created
@@ -138,4 +152,7 @@
   internal_routes_observer_.reset();
 }
 
+void MediaRouterBase::DetachRouteController(const MediaRoute::Id& route_id,
+                                            MediaRouteController* controller) {}
+
 }  // namespace media_router
diff --git a/chrome/browser/media/router/media_router_base.h b/chrome/browser/media/router/media_router_base.h
index e271003..aa84494 100644
--- a/chrome/browser/media/router/media_router_base.h
+++ b/chrome/browser/media/router/media_router_base.h
@@ -34,6 +34,9 @@
 
   std::vector<MediaRoute> GetCurrentRoutes() const override;
 
+  scoped_refptr<MediaRouteController> GetRouteController(
+      const MediaRoute::Id& route_id) override;
+
  protected:
   FRIEND_TEST_ALL_PREFIXES(MediaRouterMojoImplTest,
                            PresentationConnectionStateChangedCallback);
@@ -59,6 +62,9 @@
   // JoinRoute().
   bool HasJoinableRoute() const;
 
+  // Returns true if there is a route with the ID in the current list of routes.
+  bool IsRouteKnown(const std::string& route_id) const;
+
   using PresentationConnectionStateChangedCallbacks = base::CallbackList<void(
       const content::PresentationConnectionStateChangeInfo&)>;
 
@@ -85,6 +91,10 @@
   // KeyedService
   void Shutdown() override;
 
+  // MediaRouter
+  void DetachRouteController(const MediaRoute::Id& route_id,
+                             MediaRouteController* controller) override;
+
   std::unique_ptr<InternalMediaRoutesObserver> internal_routes_observer_;
   bool initialized_;
 
diff --git a/chrome/browser/media/router/mock_media_router.h b/chrome/browser/media/router/mock_media_router.h
index 84d176418..2a91575a 100644
--- a/chrome/browser/media/router/mock_media_router.h
+++ b/chrome/browser/media/router/mock_media_router.h
@@ -15,6 +15,7 @@
 #include "chrome/browser/media/router/media_router_base.h"
 #include "chrome/browser/media/router/media_sink.h"
 #include "chrome/browser/media/router/media_source.h"
+#include "chrome/browser/media/router/mojo/media_route_controller.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "url/origin.h"
 
@@ -91,6 +92,9 @@
   MOCK_CONST_METHOD0(GetCurrentRoutes, std::vector<MediaRoute>());
 
   MOCK_METHOD0(OnIncognitoProfileShutdown, void());
+  MOCK_METHOD1(
+      GetRouteController,
+      scoped_refptr<MediaRouteController>(const MediaRoute::Id& route_id));
   MOCK_METHOD1(OnAddPresentationConnectionStateChangedCallbackInvoked,
                void(const content::PresentationConnectionStateChangedCallback&
                         callback));
@@ -107,6 +111,9 @@
                void(RouteMessageObserver* observer));
   MOCK_METHOD1(UnregisterRouteMessageObserver,
                void(RouteMessageObserver* observer));
+  MOCK_METHOD2(DetachRouteController,
+               void(const MediaRoute::Id& route_id,
+                    MediaRouteController* controller));
 
  private:
   base::CallbackList<void(
diff --git a/chrome/browser/media/router/mojo/media_route_controller.cc b/chrome/browser/media/router/mojo/media_route_controller.cc
index 372d33a7..0fd4f8a 100644
--- a/chrome/browser/media/router/mojo/media_route_controller.cc
+++ b/chrome/browser/media/router/mojo/media_route_controller.cc
@@ -6,6 +6,8 @@
 
 #include <utility>
 
+#include "chrome/browser/media/router/media_router.h"
+
 namespace media_router {
 
 MediaRouteController::Observer::Observer(
@@ -20,7 +22,6 @@
 }
 
 void MediaRouteController::Observer::InvalidateController() {
-  controller_->RemoveObserver(this);
   controller_ = nullptr;
   OnControllerInvalidated();
 }
@@ -29,52 +30,87 @@
 
 MediaRouteController::MediaRouteController(
     const MediaRoute::Id& route_id,
-    mojom::MediaControllerPtr media_controller)
-    : route_id_(route_id), media_controller_(std::move(media_controller)) {
-  DCHECK(media_controller_.is_bound());
-  media_controller_.set_connection_error_handler(
-      base::Bind(&MediaRouteController::Invalidate, base::Unretained(this)));
+    mojom::MediaControllerPtr mojo_media_controller,
+    MediaRouter* media_router)
+    : route_id_(route_id),
+      mojo_media_controller_(std::move(mojo_media_controller)),
+      media_router_(media_router),
+      binding_(this) {
+  DCHECK(mojo_media_controller_.is_bound());
+  DCHECK(media_router);
+  mojo_media_controller_.set_connection_error_handler(base::Bind(
+      &MediaRouteController::OnMojoConnectionError, base::Unretained(this)));
 }
 
 void MediaRouteController::Play() {
-  media_controller_->Play();
+  DCHECK(is_valid_);
+  mojo_media_controller_->Play();
 }
 
 void MediaRouteController::Pause() {
-  media_controller_->Pause();
+  DCHECK(is_valid_);
+  mojo_media_controller_->Pause();
 }
 
 void MediaRouteController::Seek(base::TimeDelta time) {
-  media_controller_->Seek(time);
+  DCHECK(is_valid_);
+  mojo_media_controller_->Seek(time);
 }
 
 void MediaRouteController::SetMute(bool mute) {
-  media_controller_->SetMute(mute);
+  DCHECK(is_valid_);
+  mojo_media_controller_->SetMute(mute);
 }
 
 void MediaRouteController::SetVolume(float volume) {
-  media_controller_->SetVolume(volume);
+  DCHECK(is_valid_);
+  mojo_media_controller_->SetVolume(volume);
 }
 
 void MediaRouteController::OnMediaStatusUpdated(const MediaStatus& status) {
+  DCHECK(is_valid_);
   for (Observer& observer : observers_)
     observer.OnMediaStatusUpdated(status);
 }
 
 void MediaRouteController::Invalidate() {
+  is_valid_ = false;
+  binding_.Close();
+  mojo_media_controller_.reset();
   for (Observer& observer : observers_)
     observer.InvalidateController();
   // |this| is deleted here!
 }
 
-MediaRouteController::~MediaRouteController() {}
+mojom::MediaStatusObserverPtr MediaRouteController::BindObserverPtr() {
+  DCHECK(is_valid_);
+  DCHECK(!binding_.is_bound());
+  mojom::MediaStatusObserverPtr observer_ptr =
+      binding_.CreateInterfacePtrAndBind();
+  binding_.set_connection_error_handler(base::Bind(
+      &MediaRouteController::OnMojoConnectionError, base::Unretained(this)));
+
+  return observer_ptr;
+}
+
+MediaRouteController::~MediaRouteController() {
+  if (is_valid_)
+    media_router_->DetachRouteController(route_id_, this);
+}
 
 void MediaRouteController::AddObserver(Observer* observer) {
+  DCHECK(is_valid_);
   observers_.AddObserver(observer);
 }
 
 void MediaRouteController::RemoveObserver(Observer* observer) {
+  DCHECK(is_valid_);
   observers_.RemoveObserver(observer);
 }
 
+void MediaRouteController::OnMojoConnectionError() {
+  media_router_->DetachRouteController(route_id_, this);
+  Invalidate();
+}
+
 }  // namespace media_router
diff --git a/chrome/browser/media/router/mojo/media_route_controller.h b/chrome/browser/media/router/mojo/media_route_controller.h
index 81812e99..b8c16e2 100644
--- a/chrome/browser/media/router/mojo/media_route_controller.h
+++ b/chrome/browser/media/router/mojo/media_route_controller.h
@@ -15,6 +15,8 @@
 
 namespace media_router {
 
+class MediaRouter;
+
 // A controller for a MediaRoute. Forwards commands for controlling the route to
 // an out-of-process controller. Notifies its observers whenever there is a
 // change in the route's MediaStatus.
@@ -26,9 +28,9 @@
 //
 // A MediaRouteController instance is destroyed when all its observers dispose
 // their references to it. When the Mojo connection with the out-of-process
-// controller is terminated or has an error, OnControllerInvalidated() will be
-// called by the MediaRouter or a Mojo error handler to make observers dispose
-// their refptrs.
+// controller is terminated or has an error, Invalidate() will be called by the
+// MediaRouter or OnMojoConnectionError() to make observers dispose their
+// refptrs.
 class MediaRouteController : public mojom::MediaStatusObserver,
                              public base::RefCounted<MediaRouteController> {
  public:
@@ -66,12 +68,14 @@
   };
 
   // Constructs a MediaRouteController that forwards media commands to
-  // |media_controller|. |media_controller| must be bound to a message pipe.
+  // |mojo_media_controller|. |media_router| will be notified when the
+  // MediaRouteController is destroyed via DetachRouteController().
   MediaRouteController(const MediaRoute::Id& route_id,
-                       mojom::MediaControllerPtr media_controller);
+                       mojom::MediaControllerPtr mojo_media_controller,
+                       MediaRouter* media_router);
 
   // Media controller methods for forwarding commands to a
-  // mojom::MediaControllerPtr held in |media_controller_|.
+  // mojom::MediaControllerPtr held in |mojo_media_controller_|.
   void Play();
   void Pause();
   void Seek(base::TimeDelta time);
@@ -82,11 +86,14 @@
   // Notifies |observers_| of a status update.
   void OnMediaStatusUpdated(const MediaStatus& status) override;
 
-  // Called when the connection between |this| and |media_controller_| is no
-  // longer valid. Notifies |observers_| to dispose their references to |this|.
-  // |this| gets destroyed when all the references are disposed.
+  // Notifies |observers_| to dispose their references to the controller. The
+  // controller gets destroyed when all the references are disposed.
   void Invalidate();
 
+  // Returns a mojo pointer bound to |this| by |binding_|. This must only be
+  // called at most once in the lifetime of the controller.
+  mojom::MediaStatusObserverPtr BindObserverPtr();
+
   MediaRoute::Id route_id() const { return route_id_; }
 
  private:
@@ -97,16 +104,30 @@
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
+  // Called when the connection between |this| and the MediaControllerPtr or
+  // the MediaStatusObserver binding is no longer valid. Notifies
+  // |media_router_| and |observers_| to dispose their references to |this|.
+  void OnMojoConnectionError();
+
   // The ID of the Media Route that |this| controls.
   const MediaRoute::Id route_id_;
 
   // Handle to the mojom::MediaController that receives media commands.
-  mojom::MediaControllerPtr media_controller_;
+  mojom::MediaControllerPtr mojo_media_controller_;
 
-  // Observers that |this| notifies of status updates. The observers share the
-  // ownership of |this| through scoped_refptr.
+  // |media_router_| will be notified when the controller is destroyed.
+  MediaRouter* const media_router_;
+
+  // The binding to observe the out-of-process provider of status updates.
+  mojo::Binding<mojom::MediaStatusObserver> binding_;
+
+  // Observers that are notified of status updates. The observers share the
+  // ownership of the controller through scoped_refptr.
   base::ObserverList<Observer> observers_;
 
+  // This becomes false when the controller is invalidated.
+  bool is_valid_ = true;
+
   DISALLOW_COPY_AND_ASSIGN(MediaRouteController);
 };
 
diff --git a/chrome/browser/media/router/mojo/media_route_controller_unittest.cc b/chrome/browser/media/router/mojo/media_route_controller_unittest.cc
index 17487a5..dcfc748 100644
--- a/chrome/browser/media/router/mojo/media_route_controller_unittest.cc
+++ b/chrome/browser/media/router/mojo/media_route_controller_unittest.cc
@@ -8,31 +8,21 @@
 #include <utility>
 
 #include "base/run_loop.h"
+#include "chrome/browser/media/router/mock_media_router.h"
 #include "chrome/browser/media/router/mojo/media_router_mojo_test.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using ::testing::Mock;
 using ::testing::StrictMock;
 
 namespace media_router {
 
-class MockMediaController : public mojom::MediaController {
- public:
-  MOCK_METHOD0(Play, void());
-  MOCK_METHOD0(Pause, void());
-  MOCK_METHOD1(SetMute, void(bool mute));
-  MOCK_METHOD1(SetVolume, void(float volume));
-  MOCK_METHOD1(Seek, void(base::TimeDelta time));
-};
+namespace {
 
-class MockMediaRouteControllerObserver : public MediaRouteController::Observer {
- public:
-  MockMediaRouteControllerObserver(
-      scoped_refptr<MediaRouteController> controller)
-      : MediaRouteController::Observer(controller) {}
+constexpr char kRouteId[] = "routeId";
 
-  MOCK_METHOD1(OnMediaStatusUpdated, void(const MediaStatus& status));
-};
+}  // namespace
 
 class MediaRouteControllerTest : public ::testing::Test {
  public:
@@ -43,12 +33,11 @@
     mojom::MediaControllerPtr media_controller_ptr;
     mojom::MediaControllerRequest media_controller_request =
         mojo::MakeRequest(&media_controller_ptr);
-    media_controller_binding_ =
-        base::MakeUnique<mojo::Binding<mojom::MediaController>>(
-            &mock_media_controller_, std::move(media_controller_request));
+    mock_media_controller_.Bind(std::move(media_controller_request));
 
     observer_ = base::MakeUnique<MockMediaRouteControllerObserver>(
-        new MediaRouteController("routeId", std::move(media_controller_ptr)));
+        base::MakeShared<MediaRouteController>(
+            kRouteId, std::move(media_controller_ptr), &router_));
   }
 
   scoped_refptr<MediaRouteController> GetController() const {
@@ -63,9 +52,8 @@
         GetController());
   }
 
+  MockMediaRouter router_;
   MockMediaController mock_media_controller_;
-  std::unique_ptr<mojo::Binding<mojom::MediaController>>
-      media_controller_binding_;
   std::unique_ptr<MockMediaRouteControllerObserver> observer_;
 
   content::TestBrowserThreadBundle test_thread_bundle_;
@@ -97,18 +85,52 @@
   MediaStatus status;
   status.title = "test media status";
 
+  // Get a mojo pointer for |controller_|, so that we can notify it of status
+  // updates via mojo.
+  mojom::MediaStatusObserverPtr mojo_observer =
+      GetController()->BindObserverPtr();
+
   EXPECT_CALL(*observer1, OnMediaStatusUpdated(status));
   EXPECT_CALL(*observer2, OnMediaStatusUpdated(status));
-  // TODO(takumif): Use a mojom::MediaStatusObserverPtr bound to the controller.
-  GetController()->OnMediaStatusUpdated(status);
+  mojo_observer->OnMediaStatusUpdated(status);
+  base::RunLoop().RunUntilIdle();
 
   observer1.reset();
   auto observer3 = CreateObserver();
 
   EXPECT_CALL(*observer2, OnMediaStatusUpdated(status));
   EXPECT_CALL(*observer3, OnMediaStatusUpdated(status));
-  // TODO(takumif): Use a mojom::MediaStatusObserverPtr bound to the controller.
-  GetController()->OnMediaStatusUpdated(status);
+  mojo_observer->OnMediaStatusUpdated(status);
+  base::RunLoop().RunUntilIdle();
+}
+
+TEST_F(MediaRouteControllerTest, DestroyControllerOnDisconnect) {
+  // DetachRouteController() should be called when the connection to
+  // |mock_media_controller_| is invalidated.
+  EXPECT_CALL(router_, DetachRouteController(kRouteId, GetController().get()))
+      .Times(1);
+  mock_media_controller_.CloseBinding();
+
+  base::RunLoop().RunUntilIdle();
+  EXPECT_TRUE(Mock::VerifyAndClearExpectations(&router_));
+}
+
+TEST_F(MediaRouteControllerTest, DestroyControllerOnNoObservers) {
+  auto observer1 = CreateObserver();
+  auto observer2 = CreateObserver();
+  // Get a pointer to the controller to use in EXPECT_CALL().
+  MediaRouteController* controller = GetController().get();
+  // Get rid of |observer_| and its reference to the controller.
+  observer_.reset();
+
+  EXPECT_CALL(router_, DetachRouteController(kRouteId, controller)).Times(0);
+  observer1.reset();
+
+  // DetachRouteController() should be called when the controller no longer
+  // has any observers.
+  EXPECT_CALL(router_, DetachRouteController(kRouteId, controller)).Times(1);
+  observer2.reset();
+  EXPECT_TRUE(Mock::VerifyAndClearExpectations(&router_));
 }
 
 }  // namespace media_router
diff --git a/chrome/browser/media/router/mojo/media_router.mojom b/chrome/browser/media/router/mojo/media_router.mojom
index d5e4409..e993afd 100644
--- a/chrome/browser/media/router/mojo/media_router.mojom
+++ b/chrome/browser/media/router/mojo/media_router.mojom
@@ -4,6 +4,8 @@
 
 module media_router.mojom;
 
+import "chrome/browser/media/router/mojo/media_controller.mojom";
+import "chrome/browser/media/router/mojo/media_status.mojom";
 import "mojo/common/time.mojom";
 import "net/interfaces/ip_address.mojom";
 import "url/mojo/origin.mojom";
@@ -80,8 +82,7 @@
   string? media_source;
   // The ID of sink that is rendering the media content.
   string media_sink_id;
-  // Human readable description of this route, e.g.
-  // "Tab casting".
+  // Human readable description of this route, e.g. "Tab casting".
   string description;
   // Specifies that the route is requested locally.
   bool is_local;
@@ -369,6 +370,23 @@
   // updated. The sinks are supplied to the MediaRouteProvider so that they can
   // be used for other operations, such as route creation.
   ProvideSinks(string provider_name, array<MediaSink> sinks);
+
+  // Creates a controller for the media route with given |route_id| and binds it
+  // to |media_controller| for receiving media commands. This method returns
+  // false if such a media route doesn't exist, a controller already exists
+  // for it, or there was an error while creating a controller. This method must
+  // close |media_controller| in case of such a failure. |media_controller|
+  // becomes invalid when the media route is terminated. The created controller
+  // is destroyed when |media_controller| becomes invalid, after which this
+  // method can be called again with the same |route_id|. This method also sets
+  // |observer| to be notified whenever there is a change in the status of the
+  // media route.
+  // TODO(takumif): Consider returning an enum instead of a bool to distinguish
+  // between error conditions for metrics/debugging.
+  CreateMediaRouteController(string route_id,
+                             MediaController& media_controller,
+                             MediaStatusObserver observer) =>
+                                 (bool success);
 };
 
 // Interface for a service which observes state changes across media
diff --git a/chrome/browser/media/router/mojo/media_router_mojo_impl.cc b/chrome/browser/media/router/mojo/media_router_mojo_impl.cc
index bdea137..9d640c64 100644
--- a/chrome/browser/media/router/mojo/media_router_mojo_impl.cc
+++ b/chrome/browser/media/router/mojo/media_router_mojo_impl.cc
@@ -20,6 +20,7 @@
 #include "chrome/browser/media/router/media_routes_observer.h"
 #include "chrome/browser/media/router/media_sinks_observer.h"
 #include "chrome/browser/media/router/media_source_helper.h"
+#include "chrome/browser/media/router/mojo/media_route_controller.h"
 #include "chrome/browser/media/router/mojo/media_route_provider_util_win.h"
 #include "chrome/browser/media/router/mojo/media_router_mojo_metrics.h"
 #include "chrome/browser/media/router/route_message.h"
@@ -230,6 +231,7 @@
         << "Received routes update without any active observers: "
         << media_source;
   }
+  RemoveInvalidRouteControllers(routes);
 }
 
 void MediaRouterMojoImpl::RouteResponseReceived(
@@ -277,9 +279,9 @@
 
   SetWakeReason(MediaRouteProviderWakeReason::CREATE_ROUTE);
   int tab_id = SessionTabHelper::IdForTab(web_contents);
-  RunOrDefer(base::Bind(&MediaRouterMojoImpl::DoCreateRoute,
-                        base::Unretained(this), source_id, sink_id, origin,
-                        tab_id, callbacks, timeout, incognito));
+  RunOrDefer(base::BindOnce(&MediaRouterMojoImpl::DoCreateRoute,
+                            base::Unretained(this), source_id, sink_id, origin,
+                            tab_id, callbacks, timeout, incognito));
 }
 
 void MediaRouterMojoImpl::JoinRoute(
@@ -303,9 +305,9 @@
 
   SetWakeReason(MediaRouteProviderWakeReason::JOIN_ROUTE);
   int tab_id = SessionTabHelper::IdForTab(web_contents);
-  RunOrDefer(base::Bind(&MediaRouterMojoImpl::DoJoinRoute,
-                        base::Unretained(this), source_id, presentation_id,
-                        origin, tab_id, callbacks, timeout, incognito));
+  RunOrDefer(base::BindOnce(&MediaRouterMojoImpl::DoJoinRoute,
+                            base::Unretained(this), source_id, presentation_id,
+                            origin, tab_id, callbacks, timeout, incognito));
 }
 
 void MediaRouterMojoImpl::ConnectRouteByRouteId(
@@ -320,25 +322,25 @@
 
   SetWakeReason(MediaRouteProviderWakeReason::CONNECT_ROUTE_BY_ROUTE_ID);
   int tab_id = SessionTabHelper::IdForTab(web_contents);
-  RunOrDefer(base::Bind(&MediaRouterMojoImpl::DoConnectRouteByRouteId,
-                        base::Unretained(this), source_id, route_id, origin,
-                        tab_id, callbacks, timeout, incognito));
+  RunOrDefer(base::BindOnce(&MediaRouterMojoImpl::DoConnectRouteByRouteId,
+                            base::Unretained(this), source_id, route_id, origin,
+                            tab_id, callbacks, timeout, incognito));
 }
 
 void MediaRouterMojoImpl::TerminateRoute(const MediaRoute::Id& route_id) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   DVLOG(2) << "TerminateRoute " << route_id;
   SetWakeReason(MediaRouteProviderWakeReason::TERMINATE_ROUTE);
-  RunOrDefer(base::Bind(&MediaRouterMojoImpl::DoTerminateRoute,
-                        base::Unretained(this), route_id));
+  RunOrDefer(base::BindOnce(&MediaRouterMojoImpl::DoTerminateRoute,
+                            base::Unretained(this), route_id));
 }
 
 void MediaRouterMojoImpl::DetachRoute(const MediaRoute::Id& route_id) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   SetWakeReason(MediaRouteProviderWakeReason::DETACH_ROUTE);
-  RunOrDefer(base::Bind(&MediaRouterMojoImpl::DoDetachRoute,
-                        base::Unretained(this), route_id));
+  RunOrDefer(base::BindOnce(&MediaRouterMojoImpl::DoDetachRoute,
+                            base::Unretained(this), route_id));
 }
 
 void MediaRouterMojoImpl::SendRouteMessage(
@@ -348,8 +350,9 @@
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   SetWakeReason(MediaRouteProviderWakeReason::SEND_SESSION_MESSAGE);
-  RunOrDefer(base::Bind(&MediaRouterMojoImpl::DoSendSessionMessage,
-                        base::Unretained(this), route_id, message, callback));
+  RunOrDefer(base::BindOnce(&MediaRouterMojoImpl::DoSendSessionMessage,
+                            base::Unretained(this), route_id, message,
+                            callback));
 }
 
 void MediaRouterMojoImpl::SendRouteBinaryMessage(
@@ -359,9 +362,9 @@
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   SetWakeReason(MediaRouteProviderWakeReason::SEND_SESSION_BINARY_MESSAGE);
-  RunOrDefer(base::Bind(&MediaRouterMojoImpl::DoSendSessionBinaryMessage,
-                        base::Unretained(this), route_id,
-                        base::Passed(std::move(data)), callback));
+  RunOrDefer(base::BindOnce(&MediaRouterMojoImpl::DoSendSessionBinaryMessage,
+                            base::Unretained(this), route_id,
+                            base::Passed(std::move(data)), callback));
 }
 
 void MediaRouterMojoImpl::AddIssue(const IssueInfo& issue_info) {
@@ -393,9 +396,34 @@
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   SetWakeReason(MediaRouteProviderWakeReason::SEARCH_SINKS);
-  RunOrDefer(base::Bind(&MediaRouterMojoImpl::DoSearchSinks,
-                        base::Unretained(this), sink_id, source_id,
-                        search_input, domain, sink_callback));
+  RunOrDefer(base::BindOnce(&MediaRouterMojoImpl::DoSearchSinks,
+                            base::Unretained(this), sink_id, source_id,
+                            search_input, domain, sink_callback));
+}
+
+scoped_refptr<MediaRouteController> MediaRouterMojoImpl::GetRouteController(
+    const MediaRoute::Id& route_id) {
+  if (!IsRouteKnown(route_id))
+    return nullptr;
+
+  auto it = route_controllers_.find(route_id);
+  if (it != route_controllers_.end())
+    return scoped_refptr<MediaRouteController>(it->second);
+
+  mojom::MediaControllerPtr mojo_media_controller;
+  mojom::MediaControllerRequest mojo_media_controller_request =
+      mojo::MakeRequest(&mojo_media_controller);
+  scoped_refptr<MediaRouteController> route_controller =
+      new MediaRouteController(route_id, std::move(mojo_media_controller),
+                               this);
+
+  SetWakeReason(MediaRouteProviderWakeReason::CREATE_MEDIA_ROUTE_CONTROLLER);
+  RunOrDefer(base::BindOnce(&MediaRouterMojoImpl::DoCreateMediaRouteController,
+                            base::Unretained(this), route_id,
+                            std::move(mojo_media_controller_request),
+                            route_controller->BindObserverPtr()));
+  route_controllers_.emplace(route_id, route_controller.get());
+  return route_controller;
 }
 
 void MediaRouterMojoImpl::ProvideSinks(
@@ -434,8 +462,9 @@
     // Need to call MRPM to start observing sinks if the query is new.
     if (is_new_query) {
       SetWakeReason(MediaRouteProviderWakeReason::START_OBSERVING_MEDIA_SINKS);
-      RunOrDefer(base::Bind(&MediaRouterMojoImpl::DoStartObservingMediaSinks,
-                            base::Unretained(this), source_id));
+      RunOrDefer(
+          base::BindOnce(&MediaRouterMojoImpl::DoStartObservingMediaSinks,
+                         base::Unretained(this), source_id));
     } else if (sinks_query->cached_sink_list) {
       observer->OnSinksUpdated(*sinks_query->cached_sink_list,
                                sinks_query->origins);
@@ -469,8 +498,8 @@
       SetWakeReason(MediaRouteProviderWakeReason::STOP_OBSERVING_MEDIA_SINKS);
       // The |sinks_queries_| entry will be removed in the immediate or deferred
       // |DoStopObservingMediaSinks| call.
-      RunOrDefer(base::Bind(&MediaRouterMojoImpl::DoStopObservingMediaSinks,
-                            base::Unretained(this), source_id));
+      RunOrDefer(base::BindOnce(&MediaRouterMojoImpl::DoStopObservingMediaSinks,
+                                base::Unretained(this), source_id));
     } else {
       sinks_queries_.erase(source_id);
     }
@@ -493,8 +522,8 @@
   routes_query->observers.AddObserver(observer);
   if (is_new_query) {
     SetWakeReason(MediaRouteProviderWakeReason::START_OBSERVING_MEDIA_ROUTES);
-    RunOrDefer(base::Bind(&MediaRouterMojoImpl::DoStartObservingMediaRoutes,
-                          base::Unretained(this), source_id));
+    RunOrDefer(base::BindOnce(&MediaRouterMojoImpl::DoStartObservingMediaRoutes,
+                              base::Unretained(this), source_id));
     // The MRPM will call MediaRouterMojoImpl::OnRoutesUpdated() soon, if there
     // are any existing routes the new observer should be aware of.
   } else if (routes_query->cached_route_list) {
@@ -542,8 +571,8 @@
   it->second->observers.RemoveObserver(observer);
   if (!it->second->observers.might_have_observers()) {
     SetWakeReason(MediaRouteProviderWakeReason::STOP_OBSERVING_MEDIA_ROUTES);
-    RunOrDefer(base::Bind(&MediaRouterMojoImpl::DoStopObservingMediaRoutes,
-                          base::Unretained(this), source_id));
+    RunOrDefer(base::BindOnce(&MediaRouterMojoImpl::DoStopObservingMediaRoutes,
+                              base::Unretained(this), source_id));
   }
 }
 
@@ -596,11 +625,20 @@
     message_observers_.erase(route_id);
     SetWakeReason(
         MediaRouteProviderWakeReason::STOP_LISTENING_FOR_ROUTE_MESSAGES);
-    RunOrDefer(base::Bind(&MediaRouterMojoImpl::DoStopListeningForRouteMessages,
-                          base::Unretained(this), route_id));
+    RunOrDefer(
+        base::BindOnce(&MediaRouterMojoImpl::DoStopListeningForRouteMessages,
+                       base::Unretained(this), route_id));
   }
 }
 
+void MediaRouterMojoImpl::DetachRouteController(
+    const MediaRoute::Id& route_id,
+    MediaRouteController* controller) {
+  auto it = route_controllers_.find(route_id);
+  if (it != route_controllers_.end() && it->second == controller)
+    route_controllers_.erase(it);
+}
+
 void MediaRouterMojoImpl::DoCreateRoute(
     const MediaSource::Id& source_id,
     const MediaSink::Id& sink_id,
@@ -719,6 +757,21 @@
   media_route_provider_->ProvideSinks(provider_name, sinks);
 }
 
+void MediaRouterMojoImpl::DoCreateMediaRouteController(
+    const MediaRoute::Id& route_id,
+    mojom::MediaControllerRequest mojo_media_controller_request,
+    mojom::MediaStatusObserverPtr mojo_observer) {
+  DVLOG_WITH_INSTANCE(1) << "DoCreateMediaRouteController";
+  if (!mojo_media_controller_request.is_pending() || !mojo_observer.is_bound())
+    return;
+
+  media_route_provider_->CreateMediaRouteController(
+      route_id, std::move(mojo_media_controller_request),
+      std::move(mojo_observer),
+      base::Bind(&MediaRouterMojoImpl::OnMediaControllerCreated,
+                 base::Unretained(this), route_id));
+}
+
 void MediaRouterMojoImpl::OnRouteMessagesReceived(
     const std::string& route_id,
     const std::vector<RouteMessage>& messages) {
@@ -753,8 +806,9 @@
   } else {
     // Sinks are now available. Tell MRPM to start all sink queries again.
     for (const auto& source_and_query : sinks_queries_) {
-      RunOrDefer(base::Bind(&MediaRouterMojoImpl::DoStartObservingMediaSinks,
-                            base::Unretained(this), source_and_query.first));
+      RunOrDefer(
+          base::BindOnce(&MediaRouterMojoImpl::DoStartObservingMediaSinks,
+                         base::Unretained(this), source_and_query.first));
     }
   }
 }
@@ -850,8 +904,8 @@
   routes_queries_.erase(source_id);
 }
 
-void MediaRouterMojoImpl::EnqueueTask(const base::Closure& closure) {
-  pending_requests_.push_back(closure);
+void MediaRouterMojoImpl::EnqueueTask(base::OnceClosure closure) {
+  pending_requests_.push_back(std::move(closure));
   if (pending_requests_.size() > kMaxPendingRequests) {
     DLOG_WITH_INSTANCE(ERROR) << "Reached max queue size. Dropping oldest "
                               << "request.";
@@ -861,24 +915,24 @@
                          << pending_requests_.size() << ")";
 }
 
-void MediaRouterMojoImpl::RunOrDefer(const base::Closure& request) {
+void MediaRouterMojoImpl::RunOrDefer(base::OnceClosure request) {
   DCHECK(event_page_tracker_);
 
   if (media_route_provider_extension_id_.empty()) {
     DVLOG_WITH_INSTANCE(1) << "Extension ID not known yet.";
-    EnqueueTask(request);
+    EnqueueTask(std::move(request));
   } else if (event_page_tracker_->IsEventPageSuspended(
                  media_route_provider_extension_id_)) {
     DVLOG_WITH_INSTANCE(1) << "Waking event page.";
-    EnqueueTask(request);
+    EnqueueTask(std::move(request));
     AttemptWakeEventPage();
     media_route_provider_.reset();
   } else if (!media_route_provider_) {
     DVLOG_WITH_INSTANCE(1) << "Extension is awake, awaiting ProvideMediaRouter "
                               " to be called.";
-    EnqueueTask(request);
+    EnqueueTask(std::move(request));
   } else {
-    request.Run();
+    std::move(request).Run();
   }
 }
 
@@ -914,8 +968,8 @@
   DCHECK(event_page_tracker_);
   DCHECK(!media_route_provider_extension_id_.empty());
 
-  for (const auto& next_request : pending_requests_)
-    next_request.Run();
+  for (auto& next_request : pending_requests_)
+    std::move(next_request).Run();
 
   pending_requests_.clear();
 }
@@ -963,8 +1017,8 @@
     return;
 
   SetWakeReason(MediaRouteProviderWakeReason::ENABLE_MDNS_DISCOVERY);
-  RunOrDefer(base::Bind(&MediaRouterMojoImpl::DoEnsureMdnsDiscoveryEnabled,
-                        base::Unretained(this)));
+  RunOrDefer(base::BindOnce(&MediaRouterMojoImpl::DoEnsureMdnsDiscoveryEnabled,
+                            base::Unretained(this)));
   should_enable_mdns_discovery_ = true;
 }
 
@@ -986,14 +1040,35 @@
 void MediaRouterMojoImpl::UpdateMediaSinks(
     const MediaSource::Id& source_id) {
   SetWakeReason(MediaRouteProviderWakeReason::UPDATE_MEDIA_SINKS);
-  RunOrDefer(base::Bind(&MediaRouterMojoImpl::DoUpdateMediaSinks,
-                        base::Unretained(this), source_id));
+  RunOrDefer(base::BindOnce(&MediaRouterMojoImpl::DoUpdateMediaSinks,
+                            base::Unretained(this), source_id));
 }
 
 void MediaRouterMojoImpl::DoUpdateMediaSinks(
     const MediaSource::Id& source_id) {
-  DVLOG_WITH_INSTANCE(1) << "DoUpdateMediaSinks" << source_id;
+  DVLOG_WITH_INSTANCE(1) << "DoUpdateMediaSinks: " << source_id;
   media_route_provider_->UpdateMediaSinks(source_id);
 }
 
+void MediaRouterMojoImpl::RemoveInvalidRouteControllers(
+    const std::vector<MediaRoute>& routes) {
+  auto it = route_controllers_.begin();
+  while (it != route_controllers_.end()) {
+    if (IsRouteKnown(it->first)) {
+      ++it;
+    } else {
+      it->second->Invalidate();
+      it = route_controllers_.erase(it);
+    }
+  }
+}
+
+void MediaRouterMojoImpl::OnMediaControllerCreated(
+    const MediaRoute::Id& route_id,
+    bool success) {
+  // TODO(takumif): Record success/failure with UMA.
+  DVLOG_WITH_INSTANCE(1) << "OnMediaControllerCreated: " << route_id
+                         << (success ? " was successful." : " failed.");
+}
+
 }  // namespace media_router
diff --git a/chrome/browser/media/router/mojo/media_router_mojo_impl.h b/chrome/browser/media/router/mojo/media_router_mojo_impl.h
index f3f9d3d..bcfbd50 100644
--- a/chrome/browser/media/router/mojo/media_router_mojo_impl.h
+++ b/chrome/browser/media/router/mojo/media_router_mojo_impl.h
@@ -111,6 +111,8 @@
       const MediaSinkSearchResponseCallback& sink_callback) override;
   void ProvideSinks(const std::string& provider_name,
                     const std::vector<MediaSinkInternal>& sinks) override;
+  scoped_refptr<MediaRouteController> GetRouteController(
+      const MediaRoute::Id& route_id) override;
 
   const std::string& media_route_provider_extension_id() const {
     return media_route_provider_extension_id_;
@@ -144,6 +146,15 @@
   FRIEND_TEST_ALL_PREFIXES(MediaRouterMojoImplTest,
                            RouteMessagesMultipleObservers);
   FRIEND_TEST_ALL_PREFIXES(MediaRouterMojoImplTest, HandleIssue);
+  FRIEND_TEST_ALL_PREFIXES(MediaRouterMojoImplTest, GetRouteController);
+  FRIEND_TEST_ALL_PREFIXES(MediaRouterMojoImplTest,
+                           GetRouteControllerMultipleTimes);
+  FRIEND_TEST_ALL_PREFIXES(MediaRouterMojoImplTest,
+                           GetRouteControllerAfterInvalidation);
+  FRIEND_TEST_ALL_PREFIXES(MediaRouterMojoImplTest,
+                           GetRouteControllerAfterRouteInvalidation);
+  FRIEND_TEST_ALL_PREFIXES(MediaRouterMojoImplTest,
+                           FailToCreateRouteController);
   FRIEND_TEST_ALL_PREFIXES(MediaRouterMojoExtensionTest,
                            DeferredBindingAndSuspension);
   FRIEND_TEST_ALL_PREFIXES(MediaRouterMojoExtensionTest,
@@ -214,11 +225,11 @@
       const extensions::Extension& extension);
 
   // Enqueues a closure for later execution by ExecutePendingRequests().
-  void EnqueueTask(const base::Closure& closure);
+  void EnqueueTask(base::OnceClosure closure);
 
   // Runs a closure if the extension monitored by |extension_monitor_| is
   // active, or defers it for later execution if the extension is suspended.
-  void RunOrDefer(const base::Closure& request);
+  void RunOrDefer(base::OnceClosure request);
 
   // Dispatches the Mojo requests queued in |pending_requests_|.
   void ExecutePendingRequests();
@@ -236,6 +247,8 @@
   void UnregisterIssuesObserver(IssuesObserver* observer) override;
   void RegisterRouteMessageObserver(RouteMessageObserver* observer) override;
   void UnregisterRouteMessageObserver(RouteMessageObserver* observer) override;
+  void DetachRouteController(const MediaRoute::Id& route_id,
+                             MediaRouteController* controller) override;
 
   // Notifies |observer| of any existing cached routes, if it is still
   // registered.
@@ -285,6 +298,10 @@
       const std::string& search_input,
       const std::string& domain,
       const MediaSinkSearchResponseCallback& sink_callback);
+  void DoCreateMediaRouteController(
+      const MediaRoute::Id& route_id,
+      mojom::MediaControllerRequest mojo_media_controller_request,
+      mojom::MediaStatusObserverPtr mojo_observer);
 
   void DoProvideSinks(const std::string& provider_name,
                       const std::vector<MediaSinkInternal>& sinks);
@@ -378,9 +395,16 @@
   void UpdateMediaSinks(const MediaSource::Id& source_id);
   void DoUpdateMediaSinks(const MediaSource::Id& source_id);
 
+  // Invalidates and removes controllers from |route_controllers_| whose media
+  // routes do not appear in |routes|.
+  void RemoveInvalidRouteControllers(const std::vector<MediaRoute>& routes);
+
+  // Callback called by MRP's CreateMediaRouteController().
+  void OnMediaControllerCreated(const MediaRoute::Id& route_id, bool success);
+
   // Pending requests queued to be executed once component extension
   // becomes ready.
-  std::deque<base::Closure> pending_requests_;
+  std::deque<base::OnceClosure> pending_requests_;
 
   std::unordered_map<MediaSource::Id, std::unique_ptr<MediaSinksQuery>>
       sinks_queries_;
@@ -431,6 +455,10 @@
   // initial event page wakeup attempt.
   bool provider_version_was_recorded_ = false;
 
+  // Stores route controllers that can be used to send media commands to the
+  // extension.
+  std::unordered_map<MediaRoute::Id, MediaRouteController*> route_controllers_;
+
 #if defined(OS_WIN)
   // A pair of flags to ensure that mDNS discovery is only enabled on Windows
   // when there will be appropriate context for the user to associate a firewall
diff --git a/chrome/browser/media/router/mojo/media_router_mojo_impl_unittest.cc b/chrome/browser/media/router/mojo/media_router_mojo_impl_unittest.cc
index 55fc969..7f437f3 100644
--- a/chrome/browser/media/router/mojo/media_router_mojo_impl_unittest.cc
+++ b/chrome/browser/media/router/mojo/media_router_mojo_impl_unittest.cc
@@ -15,7 +15,6 @@
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/run_loop.h"
-#include "base/synchronization/waitable_event.h"
 #include "base/test/histogram_tester.h"
 #include "base/test/mock_callback.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ -55,6 +54,7 @@
 using testing::Pointee;
 using testing::Return;
 using testing::ReturnRef;
+using testing::Unused;
 using testing::SaveArg;
 using testing::Sequence;
 
@@ -89,11 +89,26 @@
   return issue_info;
 }
 
+// Creates a media route whose ID is |kRouteId|.
 MediaRoute CreateMediaRoute() {
   return MediaRoute(kRouteId, MediaSource(kSource), kSinkId, kDescription, true,
                     std::string(), true);
 }
 
+// Creates a media route whose ID is |kRouteId2|.
+MediaRoute CreateMediaRoute2() {
+  return MediaRoute(kRouteId2, MediaSource(kSource), kSinkId, kDescription,
+                    true, std::string(), true);
+}
+
+void OnCreateMediaRouteController(
+    Unused,
+    Unused,
+    Unused,
+    const mojom::MediaRouteProvider::CreateMediaRouteControllerCallback& cb) {
+  cb.Run(true);
+}
+
 }  // namespace
 
 class RouteResponseCallbackHandler {
@@ -745,7 +760,6 @@
 
 TEST_F(MediaRouterMojoImplTest,
        RegisterMediaSinksObserverWithAvailabilityChange) {
-
   // When availability is UNAVAILABLE, no calls should be made to MRPM.
   router()->OnSinkAvailabilityUpdated(
       mojom::MediaRouter::SinkAvailability::UNAVAILABLE);
@@ -1182,16 +1196,17 @@
   std::string domain("google.com");
   MediaSource media_source(kSource);
 
-  EXPECT_CALL(
-      mock_media_route_provider_, SearchSinks_(kSinkId, kSource, _, _))
-      .WillOnce(Invoke([&search_input, &domain](
-          const std::string& sink_id, const std::string& source,
-          const mojom::SinkSearchCriteriaPtr& search_criteria,
-          const mojom::MediaRouteProvider::SearchSinksCallback& cb) {
-        EXPECT_EQ(search_input, search_criteria->input);
-        EXPECT_EQ(domain, search_criteria->domain);
-        cb.Run(kSinkId2);
-      }));
+  EXPECT_CALL(mock_media_route_provider_,
+              SearchSinksInternal(kSinkId, kSource, _, _))
+      .WillOnce(
+          Invoke([&search_input, &domain](
+                     const std::string& sink_id, const std::string& source,
+                     const mojom::SinkSearchCriteriaPtr& search_criteria,
+                     const mojom::MediaRouteProvider::SearchSinksCallback& cb) {
+            EXPECT_EQ(search_input, search_criteria->input);
+            EXPECT_EQ(domain, search_criteria->domain);
+            cb.Run(kSinkId2);
+          }));
 
   SinkResponseCallbackHandler sink_handler;
   EXPECT_CALL(sink_handler, Invoke(kSinkId2)).Times(1);
@@ -1223,6 +1238,154 @@
   run_loop.RunUntilIdle();
 }
 
+TEST_F(MediaRouterMojoImplTest, GetRouteController) {
+  MockMediaController media_controller;
+  mojom::MediaStatusObserverPtr route_controller_as_observer;
+  MediaStatus media_status;
+  media_status.title = "test title";
+
+  router()->OnRoutesUpdated({CreateMediaRoute()}, std::string(),
+                            std::vector<std::string>());
+
+  EXPECT_CALL(mock_media_route_provider_,
+              CreateMediaRouteControllerInternal(kRouteId, _, _, _))
+      .WillOnce(Invoke([&media_controller, &route_controller_as_observer](
+                           const std::string& route_id,
+                           mojom::MediaControllerRequest& request,
+                           mojom::MediaStatusObserverPtr& observer,
+                           const mojom::MediaRouteProvider::
+                               CreateMediaRouteControllerCallback& cb) {
+        media_controller.Bind(std::move(request));
+        route_controller_as_observer = std::move(observer);
+        cb.Run(true);
+      }));
+  // GetRouteController() should return a MediaRouteController that is connected
+  // to the MediaController provided by the MediaRouteProvider, and will also be
+  // subscribed to MediaStatus updates.
+  scoped_refptr<MediaRouteController> route_controller =
+      router()->GetRouteController(kRouteId);
+  base::RunLoop().RunUntilIdle();
+
+  // Media commands sent to the MediaRouteController should be forwarded to the
+  // MediaController created by the MediaRouteProvider.
+  EXPECT_CALL(media_controller, Play());
+  route_controller->Play();
+
+  // Add an observer to the MediaRouteController.
+  MockMediaRouteControllerObserver controller_observer(route_controller);
+
+  // The MediaRouteController should be registered with the MediaRouteProvider
+  // as a MediaStatusObserver, and should also notify its own observers.
+  EXPECT_CALL(controller_observer, OnMediaStatusUpdated(media_status));
+  route_controller_as_observer->OnMediaStatusUpdated(media_status);
+
+  base::RunLoop().RunUntilIdle();
+}
+
+TEST_F(MediaRouterMojoImplTest, GetRouteControllerMultipleTimes) {
+  router()->OnRoutesUpdated({CreateMediaRoute(), CreateMediaRoute2()},
+                            std::string(), std::vector<std::string>());
+
+  EXPECT_CALL(mock_media_route_provider_,
+              CreateMediaRouteControllerInternal(kRouteId, _, _, _))
+      .WillOnce(Invoke(OnCreateMediaRouteController));
+  scoped_refptr<MediaRouteController> route_controller1a =
+      router()->GetRouteController(kRouteId);
+
+  // Calling GetRouteController() with the same route ID for the second time
+  // (without destroying the MediaRouteController first) should not result in a
+  // CreateMediaRouteController() call.
+  scoped_refptr<MediaRouteController> route_controller1b =
+      router()->GetRouteController(kRouteId);
+
+  // The same MediaRouteController instance should have been returned.
+  EXPECT_EQ(route_controller1a.get(), route_controller1b.get());
+
+  // Calling GetRouteController() with another route ID should result in a
+  // CreateMediaRouteController() call.
+  EXPECT_CALL(mock_media_route_provider_,
+              CreateMediaRouteControllerInternal(kRouteId2, _, _, _))
+      .WillOnce(Invoke(OnCreateMediaRouteController));
+  scoped_refptr<MediaRouteController> route_controller2 =
+      router()->GetRouteController(kRouteId2);
+
+  base::RunLoop().RunUntilIdle();
+}
+
+TEST_F(MediaRouterMojoImplTest, GetRouteControllerAfterInvalidation) {
+  router()->OnRoutesUpdated({CreateMediaRoute()}, std::string(),
+                            std::vector<std::string>());
+
+  EXPECT_CALL(mock_media_route_provider_,
+              CreateMediaRouteControllerInternal(kRouteId, _, _, _))
+      .Times(2)
+      .WillRepeatedly(Invoke(OnCreateMediaRouteController));
+
+  scoped_refptr<MediaRouteController> route_controller =
+      router()->GetRouteController(kRouteId);
+  // Invalidate the MediaRouteController.
+  route_controller = nullptr;
+  // Call again with the same route ID. Since we've invalidated the
+  // MediaRouteController, CreateMediaRouteController() should be called again.
+  route_controller = router()->GetRouteController(kRouteId);
+
+  base::RunLoop().RunUntilIdle();
+}
+
+TEST_F(MediaRouterMojoImplTest, GetRouteControllerAfterRouteInvalidation) {
+  router()->OnRoutesUpdated({CreateMediaRoute(), CreateMediaRoute2()},
+                            std::string(), std::vector<std::string>());
+
+  EXPECT_CALL(mock_media_route_provider_,
+              CreateMediaRouteControllerInternal(kRouteId, _, _, _))
+      .WillOnce(Invoke(OnCreateMediaRouteController));
+  EXPECT_CALL(mock_media_route_provider_,
+              CreateMediaRouteControllerInternal(kRouteId2, _, _, _))
+      .Times(2)
+      .WillRepeatedly(Invoke(OnCreateMediaRouteController));
+
+  MockMediaRouteControllerObserver observer1a(
+      router()->GetRouteController(kRouteId));
+  MockMediaRouteControllerObserver observer2a(
+      router()->GetRouteController(kRouteId2));
+
+  // Update the routes list with |kRouteId| but without |kRouteId2|. This should
+  // remove the controller for |kRouteId2|, resulting in
+  // CreateMediaRouteController() getting called again for |kRouteId2| below.
+  router()->OnRoutesUpdated({CreateMediaRoute()}, std::string(),
+                            std::vector<std::string>());
+  // Add back |kRouteId2| so that a controller can be created for it.
+  router()->OnRoutesUpdated({CreateMediaRoute(), CreateMediaRoute2()},
+                            std::string(), std::vector<std::string>());
+
+  MockMediaRouteControllerObserver observer1b(
+      router()->GetRouteController(kRouteId));
+  MockMediaRouteControllerObserver observer2b(
+      router()->GetRouteController(kRouteId2));
+
+  base::RunLoop().RunUntilIdle();
+}
+
+TEST_F(MediaRouterMojoImplTest, FailToCreateRouteController) {
+  router()->OnRoutesUpdated({CreateMediaRoute()}, std::string(),
+                            std::vector<std::string>());
+
+  EXPECT_CALL(mock_media_route_provider_,
+              CreateMediaRouteControllerInternal(kRouteId, _, _, _))
+      .WillOnce(Invoke(
+          [](Unused, Unused, Unused,
+             const mojom::MediaRouteProvider::
+                 CreateMediaRouteControllerCallback& cb) { cb.Run(false); }));
+  MockMediaRouteControllerObserver observer(
+      router()->GetRouteController(kRouteId));
+
+  // When the MediaRouter is notified that the MediaRouteProvider failed to
+  // create a controller, the browser-side controller should be invalidated.
+  EXPECT_CALL(observer, OnControllerInvalidated());
+
+  base::RunLoop().RunUntilIdle();
+}
+
 class MediaRouterMojoExtensionTest : public ::testing::Test {
  public:
   MediaRouterMojoExtensionTest() : process_manager_(nullptr) {}
diff --git a/chrome/browser/media/router/mojo/media_router_mojo_metrics.h b/chrome/browser/media/router/mojo/media_router_mojo_metrics.h
index e755b0f..9cc8b616 100644
--- a/chrome/browser/media/router/mojo/media_router_mojo_metrics.h
+++ b/chrome/browser/media/router/mojo/media_router_mojo_metrics.h
@@ -44,9 +44,10 @@
   UPDATE_MEDIA_SINKS = 16,
   SEARCH_SINKS = 17,
   PROVIDE_SINKS = 18,
+  CREATE_MEDIA_ROUTE_CONTROLLER = 19,
 
   // NOTE: Add entries only immediately above this line.
-  TOTAL_COUNT = 19
+  TOTAL_COUNT = 20
 };
 
 // The install status of the Media Router component extension.
diff --git a/chrome/browser/media/router/mojo/media_router_mojo_test.cc b/chrome/browser/media/router/mojo/media_router_mojo_test.cc
index 305877dd..d88c9649 100644
--- a/chrome/browser/media/router/mojo/media_router_mojo_test.cc
+++ b/chrome/browser/media/router/mojo/media_router_mojo_test.cc
@@ -29,6 +29,28 @@
 
 MockEventPageTracker::~MockEventPageTracker() {}
 
+MockMediaController::MockMediaController() : binding_(this) {}
+
+MockMediaController::~MockMediaController() {}
+
+void MockMediaController::Bind(mojom::MediaControllerRequest request) {
+  binding_.Bind(std::move(request));
+}
+
+mojom::MediaControllerPtr MockMediaController::BindInterfacePtr() {
+  return binding_.CreateInterfacePtrAndBind();
+}
+
+void MockMediaController::CloseBinding() {
+  binding_.Close();
+}
+
+MockMediaRouteControllerObserver::MockMediaRouteControllerObserver(
+    scoped_refptr<MediaRouteController> controller)
+    : MediaRouteController::Observer(controller) {}
+
+MockMediaRouteControllerObserver::~MockMediaRouteControllerObserver() {}
+
 MediaRouterMojoTest::MediaRouterMojoTest()
     : mock_media_router_(new MediaRouterMojoImpl(&mock_event_page_tracker_)) {
   mock_media_router_->Initialize();
diff --git a/chrome/browser/media/router/mojo/media_router_mojo_test.h b/chrome/browser/media/router/mojo/media_router_mojo_test.h
index 2538ed6..b90e43e 100644
--- a/chrome/browser/media/router/mojo/media_router_mojo_test.h
+++ b/chrome/browser/media/router/mojo/media_router_mojo_test.h
@@ -90,15 +90,28 @@
       const std::string& media_source,
       mojom::SinkSearchCriteriaPtr search_criteria,
       const SearchSinksCallback& callback) override {
-    SearchSinks_(sink_id, media_source, search_criteria, callback);
+    SearchSinksInternal(sink_id, media_source, search_criteria, callback);
   }
-  MOCK_METHOD4(SearchSinks_,
+  MOCK_METHOD4(SearchSinksInternal,
                void(const std::string& sink_id,
                     const std::string& media_source,
                     mojom::SinkSearchCriteriaPtr& search_criteria,
                     const SearchSinksCallback& callback));
   MOCK_METHOD2(ProvideSinks,
                void(const std::string&, const std::vector<MediaSinkInternal>&));
+  void CreateMediaRouteController(
+      const std::string& route_id,
+      mojom::MediaControllerRequest media_controller,
+      mojom::MediaStatusObserverPtr observer,
+      const CreateMediaRouteControllerCallback& callback) override {
+    CreateMediaRouteControllerInternal(route_id, media_controller, observer,
+                                       callback);
+  }
+  MOCK_METHOD4(CreateMediaRouteControllerInternal,
+               void(const std::string& route_id,
+                    mojom::MediaControllerRequest& media_controller,
+                    mojom::MediaStatusObserverPtr& observer,
+                    const CreateMediaRouteControllerCallback& callback));
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockMediaRouteProvider);
@@ -115,6 +128,35 @@
                     const base::Callback<void(bool)>& callback));
 };
 
+class MockMediaController : public mojom::MediaController {
+ public:
+  MockMediaController();
+  ~MockMediaController();
+
+  void Bind(mojom::MediaControllerRequest request);
+  mojom::MediaControllerPtr BindInterfacePtr();
+  void CloseBinding();
+
+  MOCK_METHOD0(Play, void());
+  MOCK_METHOD0(Pause, void());
+  MOCK_METHOD1(SetMute, void(bool mute));
+  MOCK_METHOD1(SetVolume, void(float volume));
+  MOCK_METHOD1(Seek, void(base::TimeDelta time));
+
+ private:
+  mojo::Binding<mojom::MediaController> binding_;
+};
+
+class MockMediaRouteControllerObserver : public MediaRouteController::Observer {
+ public:
+  MockMediaRouteControllerObserver(
+      scoped_refptr<MediaRouteController> controller);
+  ~MockMediaRouteControllerObserver() override;
+
+  MOCK_METHOD1(OnMediaStatusUpdated, void(const MediaStatus& status));
+  MOCK_METHOD0(OnControllerInvalidated, void());
+};
+
 // Tests the API call flow between the MediaRouterMojoImpl and the Media Router
 // Mojo service in both directions.
 class MediaRouterMojoTest : public ::testing::Test {
diff --git a/chrome/browser/notifications/notification_platform_bridge_linux.cc b/chrome/browser/notifications/notification_platform_bridge_linux.cc
index 1a7d6b24..4f364da 100644
--- a/chrome/browser/notifications/notification_platform_bridge_linux.cc
+++ b/chrome/browser/notifications/notification_platform_bridge_linux.cc
@@ -11,6 +11,7 @@
 #include "base/stl_util.h"
 #include "base/strings/nullable_string16.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/task_scheduler/post_task.h"
 #include "chrome/browser/browser_process.h"
@@ -19,6 +20,7 @@
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/browser/notifications/notification_display_service_factory.h"
 #include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/shell_integration_linux.h"
 #include "content/public/browser/notification_service.h"
 
 namespace {
@@ -377,10 +379,22 @@
 
   GVariantBuilder hints_builder;
   g_variant_builder_init(&hints_builder, G_VARIANT_TYPE("a{sv}"));
+
   g_variant_builder_add(&hints_builder, "{sv}", "urgency",
                         g_variant_new_byte(NotificationPriorityToFdoUrgency(
                             notification.priority())));
 
+  std::unique_ptr<base::Environment> env = base::Environment::Create();
+  base::FilePath desktop_file(
+      shell_integration_linux::GetDesktopName(env.get()));
+  const char kDesktopFileSuffix[] = ".desktop";
+  DCHECK(base::EndsWith(desktop_file.value(), kDesktopFileSuffix,
+                        base::CompareCase::SENSITIVE));
+
+  desktop_file = desktop_file.RemoveFinalExtension();
+  g_variant_builder_add(&hints_builder, "{sv}", "desktop-entry",
+                        g_variant_new_string(desktop_file.value().c_str()));
+
   if (!resource_files->icon_file.empty()) {
     g_variant_builder_add(
         &hints_builder, "{sv}", "image-path",
@@ -392,9 +406,10 @@
   const std::string title = base::UTF16ToUTF8(notification.title());
   const std::string message = base::UTF16ToUTF8(notification.message());
 
-  GVariant* parameters =
-      g_variant_new("(susssasa{sv}i)", "", data->dbus_id, "", title.c_str(),
-                    message.c_str(), &actions_builder, &hints_builder, -1);
+  GVariant* parameters = g_variant_new(
+      "(susssasa{sv}i)", "" /* app_name passed implicitly via desktop-entry */,
+      data->dbus_id, "" /* app_icon passed implicitly via desktop-entry */,
+      title.c_str(), message.c_str(), &actions_builder, &hints_builder, -1);
   g_dbus_proxy_call(notification_proxy_, "Notify", parameters,
                     G_DBUS_CALL_FLAGS_NONE, -1, data->cancellable, callback,
                     user_data);
diff --git a/chrome/browser/resources/bookmark_manager/js/main.js b/chrome/browser/resources/bookmark_manager/js/main.js
index ce341832..423ea4f 100644
--- a/chrome/browser/resources/bookmark_manager/js/main.js
+++ b/chrome/browser/resources/bookmark_manager/js/main.js
@@ -44,11 +44,6 @@
 var linkController;
 
 /**
- * New Windows are not allowed in Windows 8 metro mode.
- */
-var canOpenNewWindows = true;
-
-/**
  * Incognito mode availability can take the following values: ,
  *   - 'enabled' for when both normal and incognito modes are available;
  *   - 'disabled' for when incognito mode is disabled;
@@ -577,7 +572,7 @@
       updateOpenCommand(e, command,
           'open_in_new_window', 'open_all_new_window',
           // Disabled when incognito is forced.
-          incognitoModeAvailability == 'forced' || !canOpenNewWindows);
+          incognitoModeAvailability == 'forced');
       break;
 
     case 'open-incognito-window-command':
@@ -1536,10 +1531,6 @@
     incognitoModeAvailability = result;
   });
 
-  chrome.bookmarkManagerPrivate.canOpenNewWindows(function(result) {
-    canOpenNewWindows = result;
-  });
-
   cr.ui.FocusOutlineManager.forDocument(document);
   initializeSplitter();
   bmm.addBookmarkModelListeners();
diff --git a/chrome/browser/resources/md_history/side_bar.html b/chrome/browser/resources/md_history/side_bar.html
index 79a5180..d26b03c 100644
--- a/chrome/browser/resources/md_history/side_bar.html
+++ b/chrome/browser/resources/md_history/side_bar.html
@@ -67,6 +67,11 @@
         color: var(--link-color);
       }
 
+      iron-selector > a[disabled] {
+        opacity: 0.65;
+        pointer-events: none;
+      }
+
       #spacer {
         flex: 1;
       }
@@ -101,8 +106,11 @@
         <paper-ripple></paper-ripple>
       </a>
       <div class="separator"></div>
-      <a href="chrome://settings/clearBrowserData"
-          on-tap="onClearBrowsingDataTap_" id="clear-browsing-data">
+      <a id="clear-browsing-data"
+          href="chrome://settings/clearBrowserData"
+          on-tap="onClearBrowsingDataTap_"
+          disabled$="[[guestSession_]]"
+          tabindex$="[[computeClearBrowsingDataTabIndex_(guestSession_)]]">
         $i18n{clearBrowsingData}
         <iron-icon icon="cr:open-in-new"></iron-icon>
         <paper-ripple id="cbd-ripple"></paper-ripple>
diff --git a/chrome/browser/resources/md_history/side_bar.js b/chrome/browser/resources/md_history/side_bar.js
index e0f7e13..cfc0b943 100644
--- a/chrome/browser/resources/md_history/side_bar.js
+++ b/chrome/browser/resources/md_history/side_bar.js
@@ -13,6 +13,12 @@
       notify: true,
     },
 
+    /** @private */
+    guestSession_: {
+      type: Boolean,
+      value: loadTimeData.getBoolean('isGuestSession'),
+    },
+
     showFooter: Boolean,
   },
 
@@ -49,6 +55,14 @@
   },
 
   /**
+   * @return {number}
+   * @private
+   */
+  computeClearBrowsingDataTabIndex_: function() {
+    return this.guestSession_ ? -1 : 0;
+  },
+
+  /**
    * Prevent clicks on sidebar items from navigating. These are only links for
    * accessibility purposes, taps are handled separately by <iron-selector>.
    * @private
diff --git a/chrome/browser/resources/settings/a11y_page/manage_a11y_page.html b/chrome/browser/resources/settings/a11y_page/manage_a11y_page.html
index bcb42c73..887b01975 100644
--- a/chrome/browser/resources/settings/a11y_page/manage_a11y_page.html
+++ b/chrome/browser/resources/settings/a11y_page/manage_a11y_page.html
@@ -175,7 +175,8 @@
           <div class="start">$i18n{largeMouseCursorSizeLabel}</div>
           <settings-slider
              pref="{{prefs.settings.a11y.large_cursor_dip_size}}"
-             min="25" max="64" label-min="$i18n{largeMouseCursorSizeSmallLabel}"
+             min="25" max="64"
+             label-min="$i18n{largeMouseCursorSizeDefaultLabel}"
              label-max="$i18n{largeMouseCursorSizeLargeLabel}">
           </settings-slider>
         </div>
diff --git a/chrome/browser/ui/browser_command_controller.cc b/chrome/browser/ui/browser_command_controller.cc
index 3f477f4..a8f59027 100644
--- a/chrome/browser/ui/browser_command_controller.cc
+++ b/chrome/browser/ui/browser_command_controller.cc
@@ -798,7 +798,8 @@
   command_updater_.UpdateCommandEnabled(IDC_RECENT_TABS_MENU,
                                         !guest_session &&
                                         !profile()->IsOffTheRecord());
-  command_updater_.UpdateCommandEnabled(IDC_CLEAR_BROWSING_DATA, normal_window);
+  command_updater_.UpdateCommandEnabled(IDC_CLEAR_BROWSING_DATA,
+                                        !guest_session);
 #if defined(OS_CHROMEOS)
   command_updater_.UpdateCommandEnabled(IDC_TAKE_SCREENSHOT, true);
   command_updater_.UpdateCommandEnabled(IDC_TOUCH_HUD_PROJECTION_TOGGLE, true);
diff --git a/chrome/browser/ui/sync/tab_contents_synced_tab_delegate.cc b/chrome/browser/ui/sync/tab_contents_synced_tab_delegate.cc
index 311970d8..23196c2 100644
--- a/chrome/browser/ui/sync/tab_contents_synced_tab_delegate.cc
+++ b/chrome/browser/ui/sync/tab_contents_synced_tab_delegate.cc
@@ -13,6 +13,7 @@
 #include "components/sync_sessions/sync_sessions_client.h"
 #include "components/sync_sessions/synced_window_delegate.h"
 #include "components/sync_sessions/synced_window_delegates_getter.h"
+#include "components/sync_sessions/tab_node_pool.h"
 #include "content/public/browser/favicon_status.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_entry.h"
@@ -48,7 +49,8 @@
 
 TabContentsSyncedTabDelegate::TabContentsSyncedTabDelegate(
     content::WebContents* web_contents)
-    : web_contents_(web_contents), sync_session_id_(0) {}
+    : web_contents_(web_contents),
+      sync_session_id_(sync_sessions::TabNodePool::kInvalidTabNodeID) {}
 
 TabContentsSyncedTabDelegate::~TabContentsSyncedTabDelegate() {}
 
diff --git a/chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc b/chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc
index d1254b6..3d97561 100644
--- a/chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc
+++ b/chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc
@@ -126,8 +126,8 @@
     {"optionsInMenuLabel", IDS_SETTINGS_OPTIONS_IN_MENU_LABEL},
     {"largeMouseCursorLabel", IDS_SETTINGS_LARGE_MOUSE_CURSOR_LABEL},
     {"largeMouseCursorSizeLabel", IDS_SETTINGS_LARGE_MOUSE_CURSOR_SIZE_LABEL},
-    {"largeMouseCursorSizeSmallLabel",
-     IDS_SETTINGS_LARGE_MOUSE_CURSOR_SIZE_SMALL_LABEL},
+    {"largeMouseCursorSizeDefaultLabel",
+     IDS_SETTINGS_LARGE_MOUSE_CURSOR_SIZE_DEFAULT_LABEL},
     {"largeMouseCursorSizeLargeLabel",
      IDS_SETTINGS_LARGE_MOUSE_CURSOR_SIZE_LARGE_LABEL},
     {"highContrastLabel", IDS_SETTINGS_HIGH_CONTRAST_LABEL},
diff --git a/chrome/browser/win/jumplist.cc b/chrome/browser/win/jumplist.cc
index 06f2870..18c7922 100644
--- a/chrome/browser/win/jumplist.cc
+++ b/chrome/browser/win/jumplist.cc
@@ -277,6 +277,9 @@
     local_recently_closed_pages = data->recently_closed_pages_;
   }
 
+  // Delete the content in JumpListIcons folder and log the results to UMA.
+  DeleteDirectoryContentAndLogResults(icon_dir, kFileDeleteLimit);
+
   // Create a new JumpList and replace the current JumpList with it. The
   // jumplist links are updated anyway, while the jumplist icons may not as
   // mentioned above.
@@ -606,13 +609,8 @@
       profile_ ? IncognitoModePrefs::GetAvailability(profile_->GetPrefs())
                : IncognitoModePrefs::ENABLED;
 
-  // Post a task to delete the content in JumpListIcons folder and log the
-  // results to UMA.
-  update_jumplisticons_task_runner_->PostTask(
-      FROM_HERE, base::Bind(&DeleteDirectoryContentAndLogResults, icon_dir_,
-                            kFileDeleteLimit));
-
-  // Post a task to update the jumplist used by the shell.
+  // Post a task to update the jumplist in JumpListIcons folder, which consists
+  // of 1) delete old icons, 2) create new icons, 3) notify the OS.
   update_jumplisticons_task_runner_->PostTask(
       FROM_HERE, base::Bind(&RunUpdateJumpList, incognito_availability, app_id_,
                             icon_dir_, base::RetainedRef(jumplist_data_)));
diff --git a/chrome/browser/win/jumplist_file_util.cc b/chrome/browser/win/jumplist_file_util.cc
index 7c98704..9dd5b11 100644
--- a/chrome/browser/win/jumplist_file_util.cc
+++ b/chrome/browser/win/jumplist_file_util.cc
@@ -125,6 +125,9 @@
 
 void DeleteDirectoryContentAndLogResults(const base::FilePath& path,
                                          int max_file_deleted) {
+  // TODO(chengx): Remove the UMA histogram after fixing http://crbug.com/40407.
+  SCOPED_UMA_HISTOGRAM_TIMER("WinJumplist.DeleteDirectoryContentDuration");
+
   DirectoryStatus dir_status = NON_EXIST;
 
   // Delete the content in |path|. If |path| doesn't exist, create one.
diff --git a/chrome/common/extensions/api/bookmark_manager_private.json b/chrome/common/extensions/api/bookmark_manager_private.json
index ecd66ef..af832b33 100644
--- a/chrome/common/extensions/api/bookmark_manager_private.json
+++ b/chrome/common/extensions/api/bookmark_manager_private.json
@@ -209,16 +209,6 @@
         ]
       },
       {
-        "name": "canOpenNewWindows",
-        "type": "function",
-        "description": "Whether bookmarks can be opened in new windows.",
-        "parameters": [
-          {"type": "function", "name": "callback", "parameters": [
-            {"name": "result", "type": "boolean"}
-          ]}
-        ]
-      },
-      {
         "name": "removeTrees",
         "type": "function",
         "description": "Recursively removes list of bookmarks nodes.",
diff --git a/components/arc/common/notifications.mojom b/components/arc/common/notifications.mojom
index e515149..ae9a48cc 100644
--- a/components/arc/common/notifications.mojom
+++ b/components/arc/common/notifications.mojom
@@ -55,6 +55,15 @@
   EXPANDED = 2,
 };
 
+// These values represent what shows in an ARC custom notification.
+[Extensible, MinVersion=11]
+enum ArcNotificationShownContents {
+  // The normal notification contents are shown.
+  CONTENTS_SHOWN = 0,
+  // The notification settings view is shown.
+  SETTINGS_SHOWN = 1,
+};
+
 struct ArcNotificationData {
   // Identifier of notification
   string key;
@@ -108,6 +117,9 @@
   // Flag if the notification is expandable
   [MinVersion=10]
   ArcNotificationExpandState expand_state;
+  // Flag for what shows in a notification.
+  [MinVersion=11]
+  ArcNotificationShownContents shown_contents;
 };
 
 [MinVersion=2]
diff --git a/components/content_settings/core/browser/content_settings_pref_provider.cc b/components/content_settings/core/browser/content_settings_pref_provider.cc
index 3bd173e..4373861 100644
--- a/components/content_settings/core/browser/content_settings_pref_provider.cc
+++ b/components/content_settings/core/browser/content_settings_pref_provider.cc
@@ -197,6 +197,8 @@
 }
 
 void PrefProvider::DiscardObsoletePreferences() {
+  if (is_incognito_)
+    return;
   // These prefs were never stored on iOS/Android so they don't need to be
   // deleted.
 #if !defined(OS_IOS)
diff --git a/components/exo/BUILD.gn b/components/exo/BUILD.gn
index 3edaf86..389f67c 100644
--- a/components/exo/BUILD.gn
+++ b/components/exo/BUILD.gn
@@ -56,6 +56,7 @@
     "//cc/ipc:interfaces",
     "//cc/surfaces",
     "//device/gamepad",
+    "//device/gamepad/public/cpp:shared_with_blink",
     "//gpu",
     "//gpu/command_buffer/client:gles2_interface",
     "//skia",
diff --git a/components/exo/gaming_seat.cc b/components/exo/gaming_seat.cc
index eed466c..016be14 100644
--- a/components/exo/gaming_seat.cc
+++ b/components/exo/gaming_seat.cc
@@ -50,7 +50,7 @@
           GamingSeat::ThreadSafeGamepadChangeFetcher> {
  public:
   using ProcessGamepadChangesCallback =
-      base::Callback<void(int index, const blink::WebGamepad)>;
+      base::Callback<void(int index, const device::Gamepad)>;
 
   ThreadSafeGamepadChangeFetcher(
       const ProcessGamepadChangesCallback& post_gamepad_changes,
@@ -120,11 +120,11 @@
 
     DCHECK(fetcher_);
 
-    blink::WebGamepads new_state = state_;
+    device::Gamepads new_state = state_;
     fetcher_->GetGamepadData(
         false /* No hardware changed notification from the system */);
 
-    for (size_t i = 0; i < blink::WebGamepads::kItemsLengthCap; ++i) {
+    for (size_t i = 0; i < device::Gamepads::kItemsLengthCap; ++i) {
       device::PadState& pad_state = pad_states_.get()[i];
 
       // After querying the gamepad clear the state if it did not have it's
@@ -171,7 +171,7 @@
   std::unique_ptr<device::GamepadDataFetcher> fetcher_;
 
   // The current state of all gamepads.
-  blink::WebGamepads state_;
+  device::Gamepads state_;
 
   // True if a poll has been scheduled.
   bool has_poll_scheduled_ = false;
@@ -216,7 +216,7 @@
   gamepad_change_fetcher_->EnablePolling(false);
 
   delegate_->OnGamingSeatDestroying(this);
-  for (size_t i = 0; i < blink::WebGamepads::kItemsLengthCap; ++i) {
+  for (size_t i = 0; i < device::Gamepads::kItemsLengthCap; ++i) {
     if (gamepad_delegates_[i]) {
       gamepad_delegates_[i]->OnRemoved();
     }
@@ -249,11 +249,11 @@
 // GamingSeat, private:
 
 void GamingSeat::ProcessGamepadChanges(int index,
-                                       const blink::WebGamepad new_pad) {
+                                       const device::Gamepad new_pad) {
   DCHECK(thread_checker_.CalledOnValidThread());
   bool send_frame = false;
 
-  blink::WebGamepad& pad_state = pad_state_.items[index];
+  device::Gamepad& pad_state = pad_state_.items[index];
   // Update connection state.
   GamepadDelegate* delegate = gamepad_delegates_[index];
   if (new_pad.connected != pad_state.connected) {
diff --git a/components/exo/gaming_seat.h b/components/exo/gaming_seat.h
index d8fcf119..40e44ae 100644
--- a/components/exo/gaming_seat.h
+++ b/components/exo/gaming_seat.h
@@ -50,7 +50,7 @@
   class ThreadSafeGamepadChangeFetcher;
 
   // Processes updates of gamepad data and passes changes on to delegate.
-  void ProcessGamepadChanges(int index, const blink::WebGamepad new_pad);
+  void ProcessGamepadChanges(int index, const device::Gamepad new_pad);
 
   // Private implementation of methods and resources that are used on the
   // polling thread.
@@ -60,10 +60,10 @@
   GamingSeatDelegate* const delegate_;
 
   // The delegate instances that all other events are dispatched to.
-  GamepadDelegate* gamepad_delegates_[blink::WebGamepads::kItemsLengthCap];
+  GamepadDelegate* gamepad_delegates_[device::Gamepads::kItemsLengthCap];
 
   // The current state of the gamepad represented by this instance.
-  blink::WebGamepads pad_state_;
+  device::Gamepads pad_state_;
 
   // ThreadChecker for the origin thread.
   base::ThreadChecker thread_checker_;
diff --git a/components/exo/gaming_seat_unittest.cc b/components/exo/gaming_seat_unittest.cc
index 8b94ca0a..5a7893d 100644
--- a/components/exo/gaming_seat_unittest.cc
+++ b/components/exo/gaming_seat_unittest.cc
@@ -47,7 +47,7 @@
   GamingSeatTest() {}
 
   std::unique_ptr<device::GamepadDataFetcher> MockDataFetcherFactory() {
-    blink::WebGamepads initial_data;
+    device::Gamepads initial_data;
     std::unique_ptr<device::MockGamepadDataFetcher> fetcher(
         new device::MockGamepadDataFetcher(initial_data));
     mock_data_fetcher_ = fetcher.get();
@@ -73,7 +73,7 @@
     polling_task_runner_ = nullptr;
   }
 
-  void SetDataAndPostToDelegate(const blink::WebGamepads& new_data) {
+  void SetDataAndPostToDelegate(const device::Gamepads& new_data) {
     ASSERT_TRUE(mock_data_fetcher_ != nullptr);
     mock_data_fetcher_->SetTestData(new_data);
     // Run one polling cycle, which will post a task to the origin task runner.
@@ -132,7 +132,7 @@
     EXPECT_CALL(gamepad_delegate2, OnRemoved()).Times(1);
   }
   // Gamepad connected.
-  blink::WebGamepads gamepad_connected;
+  device::Gamepads gamepad_connected;
   gamepad_connected.items[0].connected = true;
   gamepad_connected.items[0].timestamp = 1;
   SetDataAndPostToDelegate(gamepad_connected);
@@ -152,7 +152,7 @@
   SetDataAndPostToDelegate(gamepad_connected);
 
   // Gamepad disconnected.
-  blink::WebGamepads all_disconnected;
+  device::Gamepads all_disconnected;
   SetDataAndPostToDelegate(all_disconnected);
 
   DestroyGamingSeat(gaming_seat_delegate);
@@ -182,7 +182,7 @@
       .WillOnce(testing::Return(&gamepad_delegate0))
       .WillOnce(testing::Return(&gamepad_delegate2));
 
-  blink::WebGamepads gamepad_connected;
+  device::Gamepads gamepad_connected;
   gamepad_connected.items[0].connected = true;
   gamepad_connected.items[0].timestamp = 1;
   SetDataAndPostToDelegate(gamepad_connected);
@@ -192,7 +192,7 @@
   SetDataAndPostToDelegate(gamepad_connected);
 
   // send axis event to 2 and then 0
-  blink::WebGamepads axis_moved;
+  device::Gamepads axis_moved;
   axis_moved.items[0].connected = true;
   axis_moved.items[0].timestamp = 1;
   axis_moved.items[2].connected = true;
@@ -241,7 +241,7 @@
       .WillOnce(testing::Return(&gamepad_delegate0))
       .WillOnce(testing::Return(&gamepad_delegate2));
 
-  blink::WebGamepads gamepad_connected;
+  device::Gamepads gamepad_connected;
   gamepad_connected.items[0].connected = true;
   gamepad_connected.items[0].timestamp = 1;
   SetDataAndPostToDelegate(gamepad_connected);
@@ -251,7 +251,7 @@
   SetDataAndPostToDelegate(gamepad_connected);
 
   // send axis event to 2 and then 0
-  blink::WebGamepads axis_moved;
+  device::Gamepads axis_moved;
   axis_moved.items[0].connected = true;
   axis_moved.items[0].timestamp = 1;
   axis_moved.items[2].connected = true;
diff --git a/components/offline_items_collection/core/BUILD.gn b/components/offline_items_collection/core/BUILD.gn
index ee5d135..8891fb5 100644
--- a/components/offline_items_collection/core/BUILD.gn
+++ b/components/offline_items_collection/core/BUILD.gn
@@ -23,10 +23,13 @@
   public_deps = [
     "//base",
     "//components/keyed_service/core",
+    "//ui/gfx",
     "//url",
   ]
 
-  deps = []
+  deps = [
+    "//ui/gfx/geometry",
+  ]
 
   if (is_android) {
     sources += [
@@ -34,6 +37,8 @@
       "android/offline_content_aggregator_bridge.h",
       "android/offline_item_bridge.cc",
       "android/offline_item_bridge.h",
+      "android/offline_item_visuals_bridge.cc",
+      "android/offline_item_visuals_bridge.h",
     ]
 
     deps += [ ":jni_headers" ]
@@ -58,12 +63,15 @@
 if (is_android) {
   android_library("core_java") {
     java_files = [
+      "android/java/src/org/chromium/components/offline_items_collection/bridges/OfflineItemBridge.java",
+      "android/java/src/org/chromium/components/offline_items_collection/bridges/OfflineItemVisualsBridge.java",
       "android/java/src/org/chromium/components/offline_items_collection/ContentId.java",
       "android/java/src/org/chromium/components/offline_items_collection/LegacyHelpers.java",
       "android/java/src/org/chromium/components/offline_items_collection/OfflineContentAggregatorBridge.java",
       "android/java/src/org/chromium/components/offline_items_collection/OfflineContentProvider.java",
       "android/java/src/org/chromium/components/offline_items_collection/OfflineItem.java",
-      "android/java/src/org/chromium/components/offline_items_collection/OfflineItemBridge.java",
+      "android/java/src/org/chromium/components/offline_items_collection/OfflineItemVisuals.java",
+      "android/java/src/org/chromium/components/offline_items_collection/VisualsCallback.java",
     ]
 
     srcjar_deps = [ ":jni_enums" ]
@@ -79,7 +87,8 @@
 
     sources = [
       "android/java/src/org/chromium/components/offline_items_collection/OfflineContentAggregatorBridge.java",
-      "android/java/src/org/chromium/components/offline_items_collection/OfflineItemBridge.java",
+      "android/java/src/org/chromium/components/offline_items_collection/bridges/OfflineItemBridge.java",
+      "android/java/src/org/chromium/components/offline_items_collection/bridges/OfflineItemVisualsBridge.java",
     ]
 
     jni_package = "components/offline_items_collection/core/android"
diff --git a/components/offline_items_collection/core/DEPS b/components/offline_items_collection/core/DEPS
index bf267f9..38d6d22e 100644
--- a/components/offline_items_collection/core/DEPS
+++ b/components/offline_items_collection/core/DEPS
@@ -4,5 +4,6 @@
   "+components/offline_pages",
   "+jni",
   "+testing",
+  "+ui/gfx",
   "+url",
 ]
diff --git a/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineContentAggregatorBridge.java b/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineContentAggregatorBridge.java
index f14368f8..8c3a57e 100644
--- a/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineContentAggregatorBridge.java
+++ b/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineContentAggregatorBridge.java
@@ -4,6 +4,8 @@
 
 package org.chromium.components.offline_items_collection;
 
+import android.os.Handler;
+
 import org.chromium.base.ObserverList;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
@@ -18,6 +20,8 @@
  */
 @JNINamespace("offline_items_collection::android")
 public class OfflineContentAggregatorBridge implements OfflineContentProvider {
+    private final Handler mHandler = new Handler();
+
     private long mNativeOfflineContentAggregatorBridge;
     private ObserverList<OfflineContentProvider.Observer> mObservers;
     private boolean mItemsAvailable;
@@ -82,8 +86,22 @@
     }
 
     @Override
-    public void addObserver(OfflineContentProvider.Observer observer) {
+    public void getVisualsForItem(ContentId id, VisualsCallback callback) {
+        nativeGetVisualsForItem(
+                mNativeOfflineContentAggregatorBridge, id.namespace, id.id, callback);
+    }
+
+    @Override
+    public void addObserver(final OfflineContentProvider.Observer observer) {
         mObservers.addObserver(observer);
+        if (!areItemsAvailable()) return;
+
+        mHandler.post(new Runnable() {
+            @Override
+            public void run() {
+                notifyObserverOfItemsReady(observer);
+            }
+        });
     }
 
     @Override
@@ -91,6 +109,11 @@
         mObservers.removeObserver(observer);
     }
 
+    private void notifyObserverOfItemsReady(Observer observer) {
+        if (!mObservers.hasObserver(observer)) return;
+        observer.onItemsAvailable();
+    }
+
     // Methods called from C++ via JNI.
     @CalledByNative
     private void onItemsAvailable() {
@@ -126,6 +149,12 @@
         }
     }
 
+    @CalledByNative
+    private static void onVisualsAvailable(
+            VisualsCallback callback, String nameSpace, String id, OfflineItemVisuals visuals) {
+        callback.onVisualsAvailable(new ContentId(nameSpace, id), visuals);
+    }
+
     /**
      * Called when the C++ OfflineContentAggregatorBridge is destroyed.  This tears down the Java
      * component of the JNI bridge so that this class, which may live due to other references, no
@@ -163,4 +192,6 @@
             long nativeOfflineContentAggregatorBridge, String nameSpace, String id);
     private native ArrayList<OfflineItem> nativeGetAllItems(
             long nativeOfflineContentAggregatorBridge);
+    private native void nativeGetVisualsForItem(long nativeOfflineContentAggregatorBridge,
+            String nameSpace, String id, VisualsCallback callback);
 }
\ No newline at end of file
diff --git a/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineContentProvider.java b/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineContentProvider.java
index 7c177a7..14613f3 100644
--- a/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineContentProvider.java
+++ b/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineContentProvider.java
@@ -11,7 +11,8 @@
  * (components/offline_items_collection/core/offline_content_provider.h) class.
  */
 public interface OfflineContentProvider {
-    /** This interface is a Java counterpart to the C++ OfflineContentProvider::Observer
+    /**
+     * This interface is a Java counterpart to the C++ OfflineContentProvider::Observer
      * (components/offline_items_collection/core/offline_content_provider.h) class.
      */
     interface Observer {
@@ -52,6 +53,9 @@
     /** See OfflineContentProvider::GetAllItems(). */
     ArrayList<OfflineItem> getAllItems();
 
+    /** See OfflineContentProvider::GetVisualsForItem(...). */
+    void getVisualsForItem(ContentId id, VisualsCallback callback);
+
     /** See OfflineContentProvider::AddObserver(...). */
     void addObserver(Observer observer);
 
diff --git a/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineItem.java b/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineItem.java
index 83b6709..c4d734d7 100644
--- a/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineItem.java
+++ b/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineItem.java
@@ -45,7 +45,7 @@
     public int percentCompleted;
     public long timeRemainingMs;
 
-    OfflineItem() {
+    public OfflineItem() {
         id = new ContentId();
         filter = OfflineItemFilter.FILTER_OTHER;
         state = OfflineItemState.COMPLETE;
diff --git a/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineItemVisuals.java b/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineItemVisuals.java
new file mode 100644
index 0000000..cb0fcab
--- /dev/null
+++ b/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineItemVisuals.java
@@ -0,0 +1,21 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.components.offline_items_collection;
+
+import android.graphics.Bitmap;
+
+import org.chromium.base.annotations.SuppressFBWarnings;
+
+/**
+ * This class is the Java counterpart to the C++ OfflineItemVisuals
+ * (components/offline_items_collection/core/offline_item.h) class.
+ *
+ * For all member variable descriptions see the C++ class.
+ * TODO(dtrainor): Investigate making all class members for this and the C++ counterpart const.
+ */
+@SuppressFBWarnings("URF_UNREAD_PUBLIC_OR_PROTECTED_FIELD")
+public class OfflineItemVisuals {
+    public Bitmap icon;
+}
\ No newline at end of file
diff --git a/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/VisualsCallback.java b/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/VisualsCallback.java
new file mode 100644
index 0000000..ec3e129
--- /dev/null
+++ b/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/VisualsCallback.java
@@ -0,0 +1,19 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.components.offline_items_collection;
+
+import android.support.annotation.Nullable;
+
+/**
+ * This interface is a Java counterpart to the C++ base::Callback meant to be used in response
+ * to {@link OfflineItemVisuals} requests.
+ */
+public interface VisualsCallback {
+    /**
+     * @param id      The {@link ContentId} that {@code visuals} is associated with.
+     * @param visuals The {@link OfflineItemVisuals}, if any, associated with {@code id}.
+     */
+    void onVisualsAvailable(ContentId id, @Nullable OfflineItemVisuals visuals);
+}
\ No newline at end of file
diff --git a/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineItemBridge.java b/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/bridges/OfflineItemBridge.java
similarity index 90%
rename from components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineItemBridge.java
rename to components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/bridges/OfflineItemBridge.java
index c520928..7f43097 100644
--- a/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineItemBridge.java
+++ b/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/bridges/OfflineItemBridge.java
@@ -2,10 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package org.chromium.components.offline_items_collection;
+package org.chromium.components.offline_items_collection.bridges;
 
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
+import org.chromium.components.offline_items_collection.OfflineItem;
+import org.chromium.components.offline_items_collection.OfflineItemFilter;
+import org.chromium.components.offline_items_collection.OfflineItemState;
 
 import java.util.ArrayList;
 
@@ -16,7 +19,7 @@
  * instances.
  */
 @JNINamespace("offline_items_collection::android")
-public class OfflineItemBridge {
+public final class OfflineItemBridge {
     private OfflineItemBridge() {}
 
     /**
diff --git a/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/bridges/OfflineItemVisualsBridge.java b/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/bridges/OfflineItemVisualsBridge.java
new file mode 100644
index 0000000..9e4b579
--- /dev/null
+++ b/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/bridges/OfflineItemVisualsBridge.java
@@ -0,0 +1,33 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.components.offline_items_collection.bridges;
+
+import android.graphics.Bitmap;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.base.annotations.JNINamespace;
+import org.chromium.components.offline_items_collection.OfflineItemVisuals;
+
+/**
+ * The Java counterpart to the C++ class OfflineItemVisualsBridge
+ * (components/offline_items_collection/core/android/offline_item_visuals_bridge.h).  This class has
+ * no public members or methods and is meant as a private factory to build
+ * {@link OfflineItemVisuals} instances.
+ */
+@JNINamespace("offline_items_collection::android")
+public final class OfflineItemVisualsBridge {
+    private OfflineItemVisualsBridge() {}
+
+    /**
+     * This is a helper method to allow C++ to create an {@link OfflineItemVisuals} object.
+     * @return The newly created {@link OfflineItemVisuals} based on the input parameters.
+     */
+    @CalledByNative
+    private static OfflineItemVisuals createOfflineItemVisuals(Bitmap icon) {
+        OfflineItemVisuals visuals = new OfflineItemVisuals();
+        visuals.icon = icon;
+        return visuals;
+    }
+}
\ No newline at end of file
diff --git a/components/offline_items_collection/core/android/offline_content_aggregator_bridge.cc b/components/offline_items_collection/core/android/offline_content_aggregator_bridge.cc
index 70184f9..6088531 100644
--- a/components/offline_items_collection/core/android/offline_content_aggregator_bridge.cc
+++ b/components/offline_items_collection/core/android/offline_content_aggregator_bridge.cc
@@ -5,7 +5,9 @@
 #include "components/offline_items_collection/core/android/offline_content_aggregator_bridge.h"
 
 #include "base/android/jni_string.h"
+#include "base/bind.h"
 #include "components/offline_items_collection/core/android/offline_item_bridge.h"
+#include "components/offline_items_collection/core/android/offline_item_visuals_bridge.h"
 #include "components/offline_items_collection/core/offline_item.h"
 #include "jni/OfflineContentAggregatorBridge_jni.h"
 
@@ -14,6 +16,7 @@
 using base::android::ConvertUTF8ToJavaString;
 using base::android::JavaParamRef;
 using base::android::ScopedJavaLocalRef;
+using base::android::ScopedJavaGlobalRef;
 
 namespace offline_items_collection {
 namespace android {
@@ -28,6 +31,16 @@
                    ConvertJavaStringToUTF8(env, j_id));
 }
 
+void GetVisualsForItemHelperCallback(ScopedJavaGlobalRef<jobject> j_callback,
+                                     const ContentId& id,
+                                     const OfflineItemVisuals* visuals) {
+  JNIEnv* env = AttachCurrentThread();
+  Java_OfflineContentAggregatorBridge_onVisualsAvailable(
+      env, j_callback.obj(), ConvertUTF8ToJavaString(env, id.name_space),
+      ConvertUTF8ToJavaString(env, id.id),
+      OfflineItemVisualsBridge::CreateOfflineItemVisuals(env, visuals));
+}
+
 }  // namespace
 
 // static.
@@ -133,6 +146,18 @@
                                                   aggregator_->GetAllItems());
 }
 
+void OfflineContentAggregatorBridge::GetVisualsForItem(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& jobj,
+    const JavaParamRef<jstring>& j_namespace,
+    const JavaParamRef<jstring>& j_id,
+    const JavaParamRef<jobject>& j_callback) {
+  aggregator_->GetVisualsForItem(
+      CreateContentId(env, j_namespace, j_id),
+      base::Bind(&GetVisualsForItemHelperCallback,
+                 ScopedJavaGlobalRef<jobject>(env, j_callback)));
+}
+
 void OfflineContentAggregatorBridge::OnItemsAvailable(
     OfflineContentProvider* provider) {
   if (java_ref_.is_null())
diff --git a/components/offline_items_collection/core/android/offline_content_aggregator_bridge.h b/components/offline_items_collection/core/android/offline_content_aggregator_bridge.h
index 5a291c6f..5a3a8cd 100644
--- a/components/offline_items_collection/core/android/offline_content_aggregator_bridge.h
+++ b/components/offline_items_collection/core/android/offline_content_aggregator_bridge.h
@@ -69,6 +69,12 @@
   base::android::ScopedJavaLocalRef<jobject> GetAllItems(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& jobj);
+  void GetVisualsForItem(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& jobj,
+      const base::android::JavaParamRef<jstring>& j_namespace,
+      const base::android::JavaParamRef<jstring>& j_id,
+      const base::android::JavaParamRef<jobject>& j_callback);
 
  private:
   OfflineContentAggregatorBridge(OfflineContentAggregator* aggregator);
diff --git a/components/offline_items_collection/core/android/offline_item_visuals_bridge.cc b/components/offline_items_collection/core/android/offline_item_visuals_bridge.cc
new file mode 100644
index 0000000..a1ff778
--- /dev/null
+++ b/components/offline_items_collection/core/android/offline_item_visuals_bridge.cc
@@ -0,0 +1,33 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/offline_items_collection/core/android/offline_item_visuals_bridge.h"
+
+#include "components/offline_items_collection/core/offline_item.h"
+#include "jni/OfflineItemVisualsBridge_jni.h"
+#include "ui/gfx/android/java_bitmap.h"
+#include "ui/gfx/image/image.h"
+
+using base::android::ScopedJavaLocalRef;
+
+namespace offline_items_collection {
+namespace android {
+
+// static
+ScopedJavaLocalRef<jobject> OfflineItemVisualsBridge::CreateOfflineItemVisuals(
+    JNIEnv* env,
+    const OfflineItemVisuals* const visuals) {
+  if (!visuals)
+    return nullptr;
+
+  base::android::ScopedJavaLocalRef<jobject> j_icon;
+
+  if (!visuals->icon.IsEmpty())
+    j_icon = gfx::ConvertToJavaBitmap(visuals->icon.ToSkBitmap());
+
+  return Java_OfflineItemVisualsBridge_createOfflineItemVisuals(env, j_icon);
+}
+
+}  // namespace android
+}  // namespace offline_items_collection
diff --git a/components/offline_items_collection/core/android/offline_item_visuals_bridge.h b/components/offline_items_collection/core/android/offline_item_visuals_bridge.h
new file mode 100644
index 0000000..472e34ec
--- /dev/null
+++ b/components/offline_items_collection/core/android/offline_item_visuals_bridge.h
@@ -0,0 +1,35 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_OFFLINE_ITEMS_COLLECTION_CORE_ANDROID_OFFLINE_ITEM_VISUALS_BRIDGE_H_
+#define COMPONENTS_OFFLINE_ITEMS_COLLECTION_CORE_ANDROID_OFFLINE_ITEM_VISUALS_BRIDGE_H_
+
+#include <vector>
+
+#include "base/android/jni_android.h"
+#include "base/android/scoped_java_ref.h"
+
+namespace offline_items_collection {
+
+struct OfflineItemVisuals;
+
+namespace android {
+
+// A helper class for creating Java OfflineItemVisuals instances from the C++
+// OfflineItemVisuals counterpart.
+class OfflineItemVisualsBridge {
+ public:
+  // Creates a Java OfflineItemVisuals from |visuals|.
+  static base::android::ScopedJavaLocalRef<jobject> CreateOfflineItemVisuals(
+      JNIEnv* env,
+      const OfflineItemVisuals* const visuals);
+
+ private:
+  OfflineItemVisualsBridge();
+};
+
+}  // namespace android
+}  // namespace offline_items_collection
+
+#endif  // COMPONENTS_OFFLINE_ITEMS_COLLECTION_CORE_ANDROID_OFFLINE_ITEM_VISUALS_BRIDGE_H_
diff --git a/components/offline_items_collection/core/offline_content_aggregator.cc b/components/offline_items_collection/core/offline_content_aggregator.cc
index acbfd5a..19eaa57 100644
--- a/components/offline_items_collection/core/offline_content_aggregator.cc
+++ b/components/offline_items_collection/core/offline_content_aggregator.cc
@@ -145,6 +145,20 @@
   return items;
 }
 
+void OfflineContentAggregator::GetVisualsForItem(
+    const ContentId& id,
+    const VisualsCallback& callback) {
+  auto it = providers_.find(id.name_space);
+
+  if (it == providers_.end()) {
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
+        FROM_HERE, base::Bind(callback, id, nullptr));
+    return;
+  }
+
+  it->second->GetVisualsForItem(id, callback);
+}
+
 void OfflineContentAggregator::AddObserver(
     OfflineContentProvider::Observer* observer) {
   DCHECK(observer);
diff --git a/components/offline_items_collection/core/offline_content_aggregator.h b/components/offline_items_collection/core/offline_content_aggregator.h
index 0349708..68df568 100644
--- a/components/offline_items_collection/core/offline_content_aggregator.h
+++ b/components/offline_items_collection/core/offline_content_aggregator.h
@@ -84,6 +84,8 @@
   void ResumeDownload(const ContentId& id) override;
   const OfflineItem* GetItemById(const ContentId& id) override;
   OfflineItemList GetAllItems() override;
+  void GetVisualsForItem(const ContentId& id,
+                         const VisualsCallback& callback) override;
   void AddObserver(OfflineContentProvider::Observer* observer) override;
   void RemoveObserver(OfflineContentProvider::Observer* observer) override;
 
diff --git a/components/offline_items_collection/core/offline_content_aggregator_unittest.cc b/components/offline_items_collection/core/offline_content_aggregator_unittest.cc
index 3619340..45d77fd 100644
--- a/components/offline_items_collection/core/offline_content_aggregator_unittest.cc
+++ b/components/offline_items_collection/core/offline_content_aggregator_unittest.cc
@@ -299,6 +299,8 @@
   EXPECT_CALL(provider2, ResumeDownload(id2)).Times(1);
   EXPECT_CALL(provider1, PauseDownload(id1)).Times(1);
   EXPECT_CALL(provider2, PauseDownload(id2)).Times(1);
+  EXPECT_CALL(provider1, GetVisualsForItem(id1, _)).Times(1);
+  EXPECT_CALL(provider2, GetVisualsForItem(id2, _)).Times(1);
   aggregator_.OpenItem(id1);
   aggregator_.OpenItem(id2);
   aggregator_.RemoveItem(id1);
@@ -309,6 +311,8 @@
   aggregator_.ResumeDownload(id2);
   aggregator_.PauseDownload(id1);
   aggregator_.PauseDownload(id2);
+  aggregator_.GetVisualsForItem(id1, OfflineContentProvider::VisualsCallback());
+  aggregator_.GetVisualsForItem(id2, OfflineContentProvider::VisualsCallback());
 }
 
 TEST_F(OfflineContentAggregatorTest, ActionPropagatesAfterInitialize) {
diff --git a/components/offline_items_collection/core/offline_content_provider.h b/components/offline_items_collection/core/offline_content_provider.h
index 353a7bc..82af995 100644
--- a/components/offline_items_collection/core/offline_content_provider.h
+++ b/components/offline_items_collection/core/offline_content_provider.h
@@ -8,6 +8,7 @@
 #include <string>
 #include <vector>
 
+#include "base/callback.h"
 #include "base/macros.h"
 #include "url/gurl.h"
 
@@ -15,6 +16,7 @@
 
 struct ContentId;
 struct OfflineItem;
+struct OfflineItemVisuals;
 
 // A provider of a set of OfflineItems that are meant to be exposed to the UI.
 // The provider is required to notify all observers of OnItemsAvailable when the
@@ -23,6 +25,8 @@
 class OfflineContentProvider {
  public:
   using OfflineItemList = std::vector<OfflineItem>;
+  using VisualsCallback =
+      base::Callback<void(const ContentId&, const OfflineItemVisuals*)>;
 
   // An observer class that should be notified of relevant changes to the
   // underlying data source.
@@ -44,6 +48,7 @@
 
     // Called when the contents of |item| have been updated and the UI should be
     // refreshed for that item.
+    // TODO(dtrainor): Make this take a list of OfflineItems.
     virtual void OnItemUpdated(const OfflineItem& item) = 0;
 
    protected:
@@ -79,6 +84,13 @@
   // Returns all OfflineItems for this particular provider.
   virtual OfflineItemList GetAllItems() = 0;
 
+  // Asks for an OfflineItemVisuals struct for an OfflineItem represented by
+  // |id| or |nullptr| if one doesn't exist.  The implementer should post any
+  // replies even if the results are available immediately to prevent reentrancy
+  // and for consistent behavior.
+  virtual void GetVisualsForItem(const ContentId& id,
+                                 const VisualsCallback& callback) = 0;
+
   // Adds an observer that should be notified of OfflineItem list modifications.
   // If the provider is already initialized OnItemsAvailable should be scheduled
   // on this observer (suggested over calling the method directly to avoid
diff --git a/components/offline_items_collection/core/offline_item.cc b/components/offline_items_collection/core/offline_item.cc
index 9506bcf7..834938d 100644
--- a/components/offline_items_collection/core/offline_item.cc
+++ b/components/offline_items_collection/core/offline_item.cc
@@ -69,4 +69,9 @@
          time_remaining_ms == offline_item.time_remaining_ms;
 }
 
+OfflineItemVisuals::OfflineItemVisuals() = default;
+OfflineItemVisuals::OfflineItemVisuals(const OfflineItemVisuals& other) =
+    default;
+OfflineItemVisuals::~OfflineItemVisuals() = default;
+
 }  // namespace offline_items_collection
diff --git a/components/offline_items_collection/core/offline_item.h b/components/offline_items_collection/core/offline_item.h
index 5c98e94..c588253 100644
--- a/components/offline_items_collection/core/offline_item.h
+++ b/components/offline_items_collection/core/offline_item.h
@@ -10,6 +10,7 @@
 #include "base/time/time.h"
 #include "components/offline_items_collection/core/offline_item_filter.h"
 #include "components/offline_items_collection/core/offline_item_state.h"
+#include "ui/gfx/image/image.h"
 #include "url/gurl.h"
 
 namespace offline_items_collection {
@@ -133,6 +134,27 @@
   int64_t time_remaining_ms;
 };
 
+// This struct holds any potentially expensive visuals for an OfflineItem.  If
+// the front end requires the visuals it will ask for them through the
+// OfflineContentProvider interface asynchronously to give the backend time to
+// generate them if necessary.
+//
+// It is not expected that these will change.  Currently the UI might cache the
+// results of this call.
+// TODO(dtrainor): If we run into a scenario where this changes, add a way for
+// an OfflineItem update to let us know about an update to the visuals.
+struct OfflineItemVisuals {
+  OfflineItemVisuals();
+  OfflineItemVisuals(const OfflineItemVisuals& other);
+
+  ~OfflineItemVisuals();
+
+  // The icon to use for displaying this item.  The icon should be 64dp x 64dp.
+  // TODO(dtrainor): Suggest icon size based on the icon size supported by the
+  // current OS.
+  gfx::Image icon;
+};
+
 }  // namespace offline_items_collection
 
 #endif  // COMPONENTS_OFFLINE_ITEMS_COLLECTION_OFFLINE_ITEM_H_
diff --git a/components/offline_items_collection/core/test_support/mock_offline_content_provider.h b/components/offline_items_collection/core/test_support/mock_offline_content_provider.h
index 5e4e0d59..c0c49a4 100644
--- a/components/offline_items_collection/core/test_support/mock_offline_content_provider.h
+++ b/components/offline_items_collection/core/test_support/mock_offline_content_provider.h
@@ -44,6 +44,8 @@
   MOCK_METHOD1(PauseDownload, void(const ContentId&));
   MOCK_METHOD1(ResumeDownload, void(const ContentId&));
   MOCK_METHOD1(GetItemById, const OfflineItem*(const ContentId&));
+  MOCK_METHOD2(GetVisualsForItem,
+               void(const ContentId&, const VisualsCallback&));
   MOCK_METHOD0(GetAllItems, OfflineItemList());
   void AddObserver(Observer* observer) override;
   void RemoveObserver(Observer* observer) override;
diff --git a/components/offline_items_collection/core/throttled_offline_content_provider.cc b/components/offline_items_collection/core/throttled_offline_content_provider.cc
index 1b534c84..ff5b16f 100644
--- a/components/offline_items_collection/core/throttled_offline_content_provider.cc
+++ b/components/offline_items_collection/core/throttled_offline_content_provider.cc
@@ -77,6 +77,12 @@
   return items;
 }
 
+void ThrottledOfflineContentProvider::GetVisualsForItem(
+    const ContentId& id,
+    const VisualsCallback& callback) {
+  wrapped_provider_->GetVisualsForItem(id, callback);
+}
+
 void ThrottledOfflineContentProvider::AddObserver(
     OfflineContentProvider::Observer* observer) {
   DCHECK(observer);
diff --git a/components/offline_items_collection/core/throttled_offline_content_provider.h b/components/offline_items_collection/core/throttled_offline_content_provider.h
index b704ffb..ca6b6d6 100644
--- a/components/offline_items_collection/core/throttled_offline_content_provider.h
+++ b/components/offline_items_collection/core/throttled_offline_content_provider.h
@@ -43,6 +43,8 @@
   // the future.
   const OfflineItem* GetItemById(const ContentId& id) override;
   OfflineItemList GetAllItems() override;
+  void GetVisualsForItem(const ContentId& id,
+                         const VisualsCallback& callback) override;
   void AddObserver(OfflineContentProvider::Observer* observer) override;
   void RemoveObserver(OfflineContentProvider::Observer* observer) override;
 
diff --git a/components/offline_items_collection/core/throttled_offline_content_provider_unittest.cc b/components/offline_items_collection/core/throttled_offline_content_provider_unittest.cc
index 414247b..912e930 100644
--- a/components/offline_items_collection/core/throttled_offline_content_provider_unittest.cc
+++ b/components/offline_items_collection/core/throttled_offline_content_provider_unittest.cc
@@ -105,15 +105,16 @@
   EXPECT_CALL(wrapped_provider_, CancelDownload(id));
   EXPECT_CALL(wrapped_provider_, PauseDownload(id));
   EXPECT_CALL(wrapped_provider_, ResumeDownload(id));
+  EXPECT_CALL(wrapped_provider_, GetVisualsForItem(id, _));
   EXPECT_CALL(wrapped_provider_, GetItemById(id)).WillRepeatedly(Return(&item));
   EXPECT_CALL(wrapped_provider_, GetAllItems()).WillRepeatedly(Return(items));
-
   wrapped_provider_.NotifyOnItemsAvailable();
   provider_.OpenItem(id);
   provider_.RemoveItem(id);
   provider_.CancelDownload(id);
   provider_.PauseDownload(id);
   provider_.ResumeDownload(id);
+  provider_.GetVisualsForItem(id, OfflineContentProvider::VisualsCallback());
   EXPECT_EQ(&item, provider_.GetItemById(id));
   EXPECT_EQ(items, provider_.GetAllItems());
 }
diff --git a/components/sync/android/java/src/org/chromium/components/sync/SyncConstants.java b/components/sync/android/java/src/org/chromium/components/sync/SyncConstants.java
index 3491726..6b639dfa8 100644
--- a/components/sync/android/java/src/org/chromium/components/sync/SyncConstants.java
+++ b/components/sync/android/java/src/org/chromium/components/sync/SyncConstants.java
@@ -10,5 +10,8 @@
     public static final String CHROME_SYNC_OAUTH2_SCOPE =
             "https://www.googleapis.com/auth/chromesync";
 
+    // This should always have the same value as TabNodePool::kInvalidTabNodeID.
+    public static final int INVALID_TAB_NODE_ID = -1;
+
     private SyncConstants() {}
 }
diff --git a/components/sync_sessions/sessions_sync_manager.cc b/components/sync_sessions/sessions_sync_manager.cc
index 665929f..f37c1b3 100644
--- a/components/sync_sessions/sessions_sync_manager.cc
+++ b/components/sync_sessions/sessions_sync_manager.cc
@@ -110,6 +110,27 @@
   return true;
 }
 
+SyncedSession::DeviceType ProtoDeviceTypeToSyncedSessionDeviceType(
+    sync_pb::SyncEnums::DeviceType proto_device_type) {
+  switch (proto_device_type) {
+    case sync_pb::SyncEnums_DeviceType_TYPE_WIN:
+      return SyncedSession::TYPE_WIN;
+    case sync_pb::SyncEnums_DeviceType_TYPE_MAC:
+      return SyncedSession::TYPE_MACOSX;
+    case sync_pb::SyncEnums_DeviceType_TYPE_LINUX:
+      return SyncedSession::TYPE_LINUX;
+    case sync_pb::SyncEnums_DeviceType_TYPE_CROS:
+      return SyncedSession::TYPE_CHROMEOS;
+    case sync_pb::SyncEnums_DeviceType_TYPE_PHONE:
+      return SyncedSession::TYPE_PHONE;
+    case sync_pb::SyncEnums_DeviceType_TYPE_TABLET:
+      return SyncedSession::TYPE_TABLET;
+    case sync_pb::SyncEnums_DeviceType_TYPE_OTHER:
+      return SyncedSession::TYPE_OTHER;
+  }
+  return SyncedSession::TYPE_OTHER;
+}
+
 }  // namespace
 
 // |local_device| is owned by ProfileSyncService, its lifetime exceeds
@@ -229,115 +250,152 @@
 void SessionsSyncManager::AssociateWindows(
     ReloadTabsOption option,
     syncer::SyncChangeList* change_output) {
-  const std::string local_tag = current_machine_tag();
-  sync_pb::SessionSpecifics specifics;
-  specifics.set_session_tag(local_tag);
-  sync_pb::SessionHeader* header_s = specifics.mutable_header();
-  SyncedSession* current_session = session_tracker_.GetSession(local_tag);
-  current_session->modified_time = base::Time::Now();
-  header_s->set_client_name(current_session_name_);
-  header_s->set_device_type(current_device_type_);
+  // Note that |current_session| is a pointer owned by |session_tracker_|.
+  // |session_tracker_| will continue to update |current_session| under
+  // the hood so care must be taken accessing it. In particular, invoking
+  // ResetSessionTracking(..) will invalidate all the tab data within
+  // the session, hence why copies of the SyncedSession must be made ahead of
+  // time.
+  SyncedSession* current_session =
+      session_tracker_.GetSession(current_machine_tag());
+  current_session->session_name = current_session_name_;
+  current_session->device_type =
+      ProtoDeviceTypeToSyncedSessionDeviceType(current_device_type_);
+  current_session->session_tag = current_machine_tag();
 
-  session_tracker_.ResetSessionTracking(local_tag);
   SyncedWindowDelegatesGetter::SyncedWindowDelegateMap windows =
       synced_window_delegates_getter()->GetSyncedWindowDelegates();
 
-  if (option == RELOAD_TABS) {
-    UMA_HISTOGRAM_COUNTS("Sync.SessionWindows", windows.size());
+  // On Android, it's possible to not have any tabbed windows if this is a cold
+  // start triggered for a custom tab. In that case, the previous session must
+  // be restored, otherwise it will be lost. On the other hand, if there is at
+  // least one tabbed window open, it's safe to overwrite the previous session
+  // entirely. See crbug.com/639009 for more info.
+  bool found_tabbed_window = false;
+  for (auto& window_iter_pair : windows) {
+    if (window_iter_pair.second->IsTypeTabbed())
+      found_tabbed_window = true;
   }
-  if (windows.size() == 0) {
-    // Assume that the window hasn't loaded. Attempting to associate now would
-    // clobber any old windows, so just return.
-    LOG(ERROR) << "No windows present, see crbug.com/639009";
-    return;
+
+  if (found_tabbed_window) {
+    // Just reset the session tracking. No need to worry about the previous
+    // session; the current tabbed windows are now the source of truth.
+    session_tracker_.ResetSessionTracking(current_machine_tag());
+    current_session->modified_time = base::Time::Now();
+  } else {
+    DVLOG(1) << "Found no tabbed windows. Reloading "
+             << current_session->windows.size()
+             << " windows from previous session.";
+
+    // A copy of the specifics must be made because |current_session| will be
+    // updated in place and therefore can't be relied on as the source of truth.
+    sync_pb::SessionHeader header_specifics;
+    header_specifics.CopyFrom(current_session->ToSessionHeaderProto());
+    session_tracker_.ResetSessionTracking(current_machine_tag());
+    PopulateSyncedSessionFromSpecifics(current_machine_tag(), header_specifics,
+                                       base::Time::Now(), current_session);
+
+    // The tab entities stored in sync have outdated SessionId values. Go
+    // through and update them to the new SessionIds.
+    for (auto& win_iter : current_session->windows) {
+      for (auto& tab : win_iter.second->wrapped_window.tabs) {
+        int sync_id = TabNodePool::kInvalidTabNodeID;
+        if (!session_tracker_.GetTabNodeFromLocalTabId(tab->tab_id.id(),
+                                                       &sync_id) ||
+            sync_id == TabNodePool::kInvalidTabNodeID) {
+          continue;
+        }
+        DVLOG(1) << "Rewriting tab node " << sync_id << " with tab id "
+                 << tab->tab_id.id();
+        AppendChangeForExistingTab(sync_id, *tab, change_output);
+      }
+    }
   }
-  for (auto window_iter_pair : windows) {
+
+  for (auto& window_iter_pair : windows) {
     const SyncedWindowDelegate* window_delegate = window_iter_pair.second;
     if (option == RELOAD_TABS) {
       UMA_HISTOGRAM_COUNTS("Sync.SessionTabs", window_delegate->GetTabCount());
     }
 
-    // Make sure the window has tabs and a viewable window. The viewable window
-    // check is necessary because, for example, when a browser is closed the
-    // destructor is not necessarily run immediately. This means its possible
-    // for us to get a handle to a browser that is about to be removed. If
-    // the tab count is 0 or the window is null, the browser is about to be
-    // deleted, so we ignore it.
+    // Make sure the window has tabs and a viewable window. The viewable
+    // window check is necessary because, for example, when a browser is
+    // closed the destructor is not necessarily run immediately. This means
+    // its possible for us to get a handle to a browser that is about to be
+    // removed. If the tab count is 0 or the window is null, the browser is
+    // about to be deleted, so we ignore it.
     if (window_delegate->ShouldSync() && window_delegate->GetTabCount() &&
         window_delegate->HasWindow()) {
       sync_pb::SessionWindow window_s;
       SessionID::id_type window_id = window_delegate->GetSessionId();
       DVLOG(1) << "Associating window " << window_id << " with "
                << window_delegate->GetTabCount() << " tabs.";
-      window_s.set_window_id(window_id);
-      // Note: We don't bother to set selected tab index anymore. We still
-      // consume it when receiving foreign sessions, as reading it is free, but
-      // it triggers too many sync cycles with too little value to make setting
-      // it worthwhile.
-      if (window_delegate->IsTypeTabbed()) {
-        window_s.set_browser_type(
-            sync_pb::SessionWindow_BrowserType_TYPE_TABBED);
-      } else if (window_delegate->IsTypePopup()) {
-        window_s.set_browser_type(
-            sync_pb::SessionWindow_BrowserType_TYPE_POPUP);
-      } else {
-        // This is a custom tab within an app. These will not be restored on
-        // startup if not present.
-        window_s.set_browser_type(
-            sync_pb::SessionWindow_BrowserType_TYPE_CUSTOM_TAB);
-      }
 
       bool found_tabs = false;
       for (int j = 0; j < window_delegate->GetTabCount(); ++j) {
         SessionID::id_type tab_id = window_delegate->GetTabIdAt(j);
         SyncedTabDelegate* synced_tab = window_delegate->GetTabAt(j);
 
-        // GetTabAt can return a null tab; in that case just skip it.
-        if (!synced_tab)
+        // GetTabAt can return a null tab; in that case just skip it. Similarly,
+        // if for some reason the tab id is invalid, skip it.
+        if (!synced_tab || !ShouldSyncTabId(tab_id))
           continue;
 
-        if (!ShouldSyncTabId(tab_id)) {
-          LOG(ERROR) << "Not syncing invalid tab with id " << tab_id;
-          continue;
-        }
-
         // Placeholder tabs are those without WebContents, either because they
         // were never loaded into memory or they were evicted from memory
-        // (typically only on Android devices). They only have a tab id, window
-        // id, and a saved synced id (corresponding to the tab node id). Note
-        // that only placeholders have this sync id, as it's necessary to
-        // properly reassociate the tab with the entity that was backing it.
+        // (typically only on Android devices). They only have a tab id,
+        // window id, and a saved synced id (corresponding to the tab node
+        // id). Note that only placeholders have this sync id, as it's
+        // necessary to properly reassociate the tab with the entity that was
+        // backing it.
         if (synced_tab->IsPlaceholderTab()) {
           // For tabs without WebContents update the |tab_id| and |window_id|,
           // as it could have changed after a session restore.
           if (synced_tab->GetSyncId() > TabNodePool::kInvalidTabNodeID) {
             AssociateRestoredPlaceholderTab(*synced_tab, tab_id, window_id,
                                             change_output);
+          } else {
+            DVLOG(1) << "Placeholder tab " << tab_id << " has no sync id.";
           }
         } else if (RELOAD_TABS == option) {
           AssociateTab(synced_tab, change_output);
         }
 
         // If the tab was syncable, it would have been added to the tracker
-        // either by the above Associate[RestoredPlaceholder]Tab call or by the
-        // OnLocalTabModified method invoking AssociateTab directly. Therefore,
-        // we can key whether this window has valid tabs based on the tab's
-        // presence in the tracker.
+        // either by the above Associate[RestoredPlaceholder]Tab call or by
+        // the OnLocalTabModified method invoking AssociateTab directly.
+        // Therefore, we can key whether this window has valid tabs based on
+        // the tab's presence in the tracker.
         const sessions::SessionTab* tab = nullptr;
-        if (session_tracker_.LookupSessionTab(local_tag, tab_id, &tab)) {
+        if (session_tracker_.LookupSessionTab(current_machine_tag(), tab_id,
+                                              &tab)) {
           found_tabs = true;
-          window_s.add_tab(tab_id);
+
+          // Update this window's representation in the synced session tracker.
+          // This is a no-op if called multiple times.
+          session_tracker_.PutWindowInSession(current_machine_tag(), window_id);
+
+          // Put the tab in the window (must happen after the window is added
+          // to the session).
+          session_tracker_.PutTabInWindow(current_machine_tag(), window_id,
+                                          tab_id);
         }
       }
       if (found_tabs) {
-        sync_pb::SessionWindow* header_window = header_s->add_window();
-        *header_window = window_s;
-
-        // Update this window's representation in the synced session tracker.
-        session_tracker_.PutWindowInSession(local_tag, window_id);
-        BuildSyncedSessionFromSpecifics(
-            local_tag, window_s, current_session->modified_time,
-            current_session->windows[window_id].get());
+        SyncedSessionWindow* synced_session_window =
+            current_session->windows[window_id].get();
+        if (window_delegate->IsTypeTabbed()) {
+          synced_session_window->window_type =
+              sync_pb::SessionWindow_BrowserType_TYPE_TABBED;
+        } else if (window_delegate->IsTypePopup()) {
+          synced_session_window->window_type =
+              sync_pb::SessionWindow_BrowserType_TYPE_POPUP;
+        } else {
+          // This is a custom tab within an app. These will not be restored on
+          // startup if not present.
+          synced_session_window->window_type =
+              sync_pb::SessionWindow_BrowserType_TYPE_CUSTOM_TAB;
+        }
       }
     }
   }
@@ -350,7 +408,9 @@
   // if the entity specifics are identical (i.e windows, client name did
   // not change).
   sync_pb::EntitySpecifics entity;
-  entity.mutable_session()->CopyFrom(specifics);
+  entity.mutable_session()->set_session_tag(current_machine_tag());
+  entity.mutable_session()->mutable_header()->CopyFrom(
+      current_session->ToSessionHeaderProto());
   syncer::SyncData data = syncer::SyncData::CreateLocalData(
       current_machine_tag(), current_session_name_, entity);
   change_output->push_back(
@@ -375,10 +435,17 @@
            << tab_delegate->GetWindowId();
 
   int tab_node_id = TabNodePool::kInvalidTabNodeID;
-  bool existing_tab_node =
-      session_tracker_.GetTabNodeFromLocalTabId(tab_id, &tab_node_id);
-  CHECK_NE(TabNodePool::kInvalidTabNodeID, tab_node_id) << "crbug.com/673618";
-  tab_delegate->SetSyncId(tab_node_id);
+  bool existing_tab_node = true;
+  if (session_tracker_.IsLocalTabNodeAssociated(tab_delegate->GetSyncId())) {
+    tab_node_id = tab_delegate->GetSyncId();
+    session_tracker_.ReassociateLocalTab(tab_node_id, tab_id);
+  } else {
+    existing_tab_node =
+        session_tracker_.GetTabNodeFromLocalTabId(tab_id, &tab_node_id);
+    CHECK_NE(TabNodePool::kInvalidTabNodeID, tab_node_id) << "crbug.com/673618";
+    tab_delegate->SetSyncId(tab_node_id);
+  }
+
   sessions::SessionTab* session_tab =
       session_tracker_.GetTab(current_machine_tag(), tab_id);
 
@@ -633,6 +700,12 @@
 bool SessionsSyncManager::InitFromSyncModel(
     const syncer::SyncDataList& sync_data,
     syncer::SyncChangeList* new_changes) {
+  // Map of all rewritten local ids. Because ids are reset on each restart,
+  // and id generation happens outside of Sync, all ids from a previous local
+  // session must be rewritten in order to be valid.
+  // Key: previous session id. Value: new session id.
+  std::map<SessionID::id_type, SessionID::id_type> session_id_map;
+
   bool found_current_header = false;
   int bad_foreign_hash_count = 0;
   for (syncer::SyncDataList::const_iterator it = sync_data.begin();
@@ -669,9 +742,37 @@
         if (specifics.header().has_client_name())
           current_session_name_ = specifics.header().client_name();
 
-        // TODO(zea): crbug.com/639009 update the tracker with the specifics
-        // from the header node as well. This will be necessary to preserve
-        // the set of open tabs when a custom tab is opened.
+        // The specifics from the SyncData are immutable. Create a mutable copy
+        // to hold the rewritten ids.
+        sync_pb::SessionSpecifics rewritten_specifics(specifics);
+
+        // Go through and generate new tab and window ids as necessary, updating
+        // the specifics in place.
+        for (auto& window :
+             *rewritten_specifics.mutable_header()->mutable_window()) {
+          session_id_map[window.window_id()] = SessionID().id();
+          window.set_window_id(session_id_map[window.window_id()]);
+
+          google::protobuf::RepeatedField<int>* tab_ids = window.mutable_tab();
+          for (int i = 0; i < tab_ids->size(); i++) {
+            auto tab_iter = session_id_map.find(tab_ids->Get(i));
+            if (tab_iter == session_id_map.end()) {
+              // SessionID::SessionID() automatically increments a static
+              // variable, forcing a new id to be generated each time.
+              session_id_map[tab_ids->Get(i)] = SessionID().id();
+            }
+            *(tab_ids->Mutable(i)) = session_id_map[tab_ids->Get(i)];
+            // Note: the tab id of the SessionTab will be updated when the tab
+            // node itself is processed.
+          }
+        }
+
+        UpdateTrackerWithSpecifics(rewritten_specifics,
+                                   remote.GetModifiedTime());
+
+        DVLOG(1) << "Loaded local header and rewrote " << session_id_map.size()
+                 << " ids.";
+
       } else {
         if (specifics.has_header() || !specifics.has_tab()) {
           LOG(WARNING) << "Found more than one session header node with local "
@@ -686,12 +787,33 @@
             new_changes->push_back(tombstone);
         } else {
           // This is a valid old tab node, add it to the tracker and associate
-          // it.
+          // it (using the new tab id).
           DVLOG(1) << "Associating local tab " << specifics.tab().tab_id()
                    << " with node " << specifics.tab_node_id();
-          session_tracker_.ReassociateLocalTab(specifics.tab_node_id(),
-                                               specifics.tab().tab_id());
-          UpdateTrackerWithSpecifics(specifics, remote.GetModifiedTime());
+
+          // Now file the tab under the new tab id.
+          SessionID::id_type new_tab_id = kInvalidTabID;
+          auto iter = session_id_map.find(specifics.tab().tab_id());
+          if (iter != session_id_map.end()) {
+            new_tab_id = iter->second;
+          } else {
+            session_id_map[specifics.tab().tab_id()] = SessionID().id();
+            new_tab_id = session_id_map[specifics.tab().tab_id()];
+          }
+          DVLOG(1) << "Remapping tab " << specifics.tab().tab_id() << " to "
+                   << new_tab_id;
+
+          // The specifics from the SyncData are immutable. Create a mutable
+          // copy to hold the rewritten ids.
+          sync_pb::SessionSpecifics rewritten_specifics(specifics);
+          rewritten_specifics.mutable_tab()->set_tab_id(new_tab_id);
+          session_tracker_.ReassociateLocalTab(
+              rewritten_specifics.tab_node_id(), new_tab_id);
+          UpdateTrackerWithSpecifics(rewritten_specifics,
+                                     remote.GetModifiedTime());
+
+          session_tracker_.ReassociateLocalTab(
+              rewritten_specifics.tab_node_id(), new_tab_id);
         }
       }
     }
@@ -703,7 +825,7 @@
   session_tracker_.LookupAllForeignSessions(&sessions,
                                             SyncedSessionTracker::RAW);
   for (const auto* session : sessions) {
-    session_tracker_.CleanupForeignSession(session->session_tag);
+    session_tracker_.CleanupSession(session->session_tag);
   }
 
   UMA_HISTOGRAM_COUNTS_100("Sync.SessionsBadForeignHashOnMergeCount",
@@ -730,27 +852,17 @@
 
     // Load (or create) the SyncedSession object for this client.
     const sync_pb::SessionHeader& header = specifics.header();
-    PopulateSessionHeaderFromSpecifics(header, modification_time, session);
 
     // Reset the tab/window tracking for this session (must do this before
     // we start calling PutWindowInSession and PutTabInWindow so that all
     // unused tabs/windows get cleared by the CleanupSession(...) call).
     session_tracker_.ResetSessionTracking(session_tag);
 
-    // Process all the windows and their tab information.
-    int num_windows = header.window_size();
-    DVLOG(1) << "Populating " << session_tag << " with " << num_windows
-             << " windows.";
+    PopulateSyncedSessionFromSpecifics(session_tag, header, modification_time,
+                                       session);
 
-    for (int i = 0; i < num_windows; ++i) {
-      const sync_pb::SessionWindow& window_s = header.window(i);
-      SessionID::id_type window_id = window_s.window_id();
-      session_tracker_.PutWindowInSession(session_tag, window_id);
-      BuildSyncedSessionFromSpecifics(session_tag, window_s, modification_time,
-                                      session->windows[window_id].get());
-    }
     // Delete any closed windows and unused tabs as necessary.
-    session_tracker_.CleanupForeignSession(session_tag);
+    session_tracker_.CleanupSession(session_tag);
   } else if (specifics.has_tab()) {
     const sync_pb::SessionTab& tab_s = specifics.tab();
     SessionID::id_type tab_id = tab_s.tab_id();
@@ -822,46 +934,37 @@
   }
 }
 
-// static
-void SessionsSyncManager::PopulateSessionHeaderFromSpecifics(
+void SessionsSyncManager::PopulateSyncedSessionFromSpecifics(
+    const std::string& session_tag,
     const sync_pb::SessionHeader& header_specifics,
     base::Time mtime,
-    SyncedSession* session_header) {
+    SyncedSession* synced_session) {
   if (header_specifics.has_client_name())
-    session_header->session_name = header_specifics.client_name();
+    synced_session->session_name = header_specifics.client_name();
   if (header_specifics.has_device_type()) {
-    switch (header_specifics.device_type()) {
-      case sync_pb::SyncEnums_DeviceType_TYPE_WIN:
-        session_header->device_type = SyncedSession::TYPE_WIN;
-        break;
-      case sync_pb::SyncEnums_DeviceType_TYPE_MAC:
-        session_header->device_type = SyncedSession::TYPE_MACOSX;
-        break;
-      case sync_pb::SyncEnums_DeviceType_TYPE_LINUX:
-        session_header->device_type = SyncedSession::TYPE_LINUX;
-        break;
-      case sync_pb::SyncEnums_DeviceType_TYPE_CROS:
-        session_header->device_type = SyncedSession::TYPE_CHROMEOS;
-        break;
-      case sync_pb::SyncEnums_DeviceType_TYPE_PHONE:
-        session_header->device_type = SyncedSession::TYPE_PHONE;
-        break;
-      case sync_pb::SyncEnums_DeviceType_TYPE_TABLET:
-        session_header->device_type = SyncedSession::TYPE_TABLET;
-        break;
-      case sync_pb::SyncEnums_DeviceType_TYPE_OTHER:
-      // Intentionally fall-through
-      default:
-        session_header->device_type = SyncedSession::TYPE_OTHER;
-        break;
-    }
+    synced_session->device_type = ProtoDeviceTypeToSyncedSessionDeviceType(
+        header_specifics.device_type());
   }
-  session_header->modified_time =
-      std::max(mtime, session_header->modified_time);
+  synced_session->modified_time =
+      std::max(mtime, synced_session->modified_time);
+
+  // Process all the windows and their tab information.
+  int num_windows = header_specifics.window_size();
+  DVLOG(1) << "Populating " << session_tag << " with " << num_windows
+           << " windows.";
+
+  for (int i = 0; i < num_windows; ++i) {
+    const sync_pb::SessionWindow& window_s = header_specifics.window(i);
+    SessionID::id_type window_id = window_s.window_id();
+    session_tracker_.PutWindowInSession(session_tag, window_id);
+    PopulateSyncedSessionWindowFromSpecifics(
+        session_tag, window_s, synced_session->modified_time,
+        synced_session->windows[window_id].get());
+  }
 }
 
 // static
-void SessionsSyncManager::BuildSyncedSessionFromSpecifics(
+void SessionsSyncManager::PopulateSyncedSessionWindowFromSpecifics(
     const std::string& session_tag,
     const sync_pb::SessionWindow& specifics,
     base::Time mtime,
@@ -1017,14 +1120,22 @@
       session_tracker_.GetTab(current_machine_tag(), new_tab_id);
   local_tab->window_id.set_id(new_window_id);
 
+  AppendChangeForExistingTab(tab_delegate.GetSyncId(), *local_tab,
+                             change_output);
+}
+
+void SessionsSyncManager::AppendChangeForExistingTab(
+    int sync_id,
+    const sessions::SessionTab& tab,
+    syncer::SyncChangeList* change_output) {
   // Rewrite the specifics based on the reassociated SessionTab to preserve
   // the new tab and window ids.
   sync_pb::EntitySpecifics entity;
-  entity.mutable_session()->CopyFrom(SessionTabToSpecifics(
-      *local_tab, current_machine_tag(), tab_delegate.GetSyncId()));
+  entity.mutable_session()->CopyFrom(
+      SessionTabToSpecifics(tab, current_machine_tag(), sync_id));
   syncer::SyncData data = syncer::SyncData::CreateLocalData(
-      TabNodeIdToTag(current_machine_tag(), tab_delegate.GetSyncId()),
-      current_session_name_, entity);
+      TabNodeIdToTag(current_machine_tag(), sync_id), current_session_name_,
+      entity);
   change_output->push_back(
       syncer::SyncChange(FROM_HERE, syncer::SyncChange::ACTION_UPDATE, data));
 }
diff --git a/components/sync_sessions/sessions_sync_manager.h b/components/sync_sessions/sessions_sync_manager.h
index bf72e9e..80706d86 100644
--- a/components/sync_sessions/sessions_sync_manager.h
+++ b/components/sync_sessions/sessions_sync_manager.h
@@ -119,7 +119,7 @@
  private:
   friend class extensions::ExtensionSessionsTest;
   friend class SessionsSyncManagerTest;
-  FRIEND_TEST_ALL_PREFIXES(SessionsSyncManagerTest, PopulateSessionHeader);
+  FRIEND_TEST_ALL_PREFIXES(SessionsSyncManagerTest, PopulateSyncedSession);
   FRIEND_TEST_ALL_PREFIXES(SessionsSyncManagerTest, PopulateSessionWindow);
   FRIEND_TEST_ALL_PREFIXES(SessionsSyncManagerTest, ValidTabs);
   FRIEND_TEST_ALL_PREFIXES(SessionsSyncManagerTest, SetSessionTabFromDelegate);
@@ -187,14 +187,15 @@
 
   // Used to populate a session header from the session specifics header
   // provided.
-  static void PopulateSessionHeaderFromSpecifics(
+  void PopulateSyncedSessionFromSpecifics(
+      const std::string& session_tag,
       const sync_pb::SessionHeader& header_specifics,
       base::Time mtime,
-      SyncedSession* session_header);
+      SyncedSession* synced_session);
 
-  // Builds |session_window| from the session specifics window
+  // Builds |synced_session_window| from the session specifics window
   // provided and updates the SessionTracker with foreign session data created.
-  void BuildSyncedSessionFromSpecifics(
+  void PopulateSyncedSessionWindowFromSpecifics(
       const std::string& session_tag,
       const sync_pb::SessionWindow& specifics,
       base::Time mtime,
@@ -246,6 +247,12 @@
       SessionID::id_type new_window_id,
       syncer::SyncChangeList* change_output);
 
+  // Appends an ACTION_UPDATE for a sync tab entity onto |change_output| to
+  // reflect the contents of |tab|, given the tab node id |sync_id|.
+  void AppendChangeForExistingTab(int sync_id,
+                                  const sessions::SessionTab& tab,
+                                  syncer::SyncChangeList* change_output);
+
   // Stops and re-starts syncing to rebuild association mappings. Returns true
   // when re-starting succeeds.
   // See |local_tab_pool_out_of_sync_|.
diff --git a/components/sync_sessions/sessions_sync_manager_unittest.cc b/components/sync_sessions/sessions_sync_manager_unittest.cc
index 7479a18..bc22ca115 100644
--- a/components/sync_sessions/sessions_sync_manager_unittest.cc
+++ b/components/sync_sessions/sessions_sync_manager_unittest.cc
@@ -243,7 +243,7 @@
  private:
   int current_entry_index_ = -1;
   bool is_supervised_ = false;
-  int sync_id_ = -1;
+  int sync_id_ = kInvalidTabID;
   SessionID tab_id_;
   SessionID window_id_;
   std::vector<std::unique_ptr<const sessions::SerializedNavigationEntry>>
@@ -328,7 +328,7 @@
 
  private:
   SessionID::id_type session_id_;
-  int sync_id_;
+  int sync_id_ = kInvalidTabID;
 };
 
 class TestSyncedWindowDelegate : public SyncedWindowDelegate {
@@ -358,6 +358,10 @@
     return false;
   }
 
+  void OverrideWindowTypeToCustomTab() {
+    window_type_ = sync_pb::SessionWindow_BrowserType_TYPE_CUSTOM_TAB;
+  }
+
   SyncedTabDelegate* GetTabAt(int index) const override {
     if (tab_delegates_.find(index) != tab_delegates_.end())
       return tab_delegates_.find(index)->second;
@@ -387,6 +391,8 @@
   SessionID window_id_;
   sync_pb::SessionWindow_BrowserType window_type_ =
       sync_pb::SessionWindow_BrowserType_TYPE_TABBED;
+  std::map<int, SyncedTabDelegate*> tab_overrides_;
+  std::map<int, SessionID::id_type> tab_id_overrides_;
 };
 
 class TestSyncedWindowDelegatesGetter : public SyncedWindowDelegatesGetter {
@@ -410,6 +416,8 @@
     delegates_[delegate->GetSessionId()] = delegate;
   }
 
+  void ClearSyncedWindowDelegates() { delegates_.clear(); }
+
  private:
   SyncedWindowDelegateMap delegates_;
 };
@@ -469,7 +477,7 @@
   void StartRoutingTo(LocalSessionEventHandler* handler) override {
     handler_ = handler;
   }
-  void Stop() override {}
+  void Stop() override { handler_ = nullptr; }
 
   void NotifyNav(SyncedTabDelegate* tab) {
     if (handler_)
@@ -716,12 +724,45 @@
     NavigateTab(delegate, url, base::Time());
   }
 
+  void ResetWindows() {
+    window_getter_.ClearSyncedWindowDelegates();
+    windows_.clear();
+  }
+
   TestSyncedWindowDelegate* AddWindow() {
     windows_.push_back(base::MakeUnique<TestSyncedWindowDelegate>());
     window_getter_.AddSyncedWindowDelegate(windows_.back().get());
     return windows_.back().get();
   }
 
+  syncer::SyncDataList GetDataFromChanges(
+      const syncer::SyncChangeList& changes) {
+    syncer::SyncDataList data_list;
+    for (auto& change : changes) {
+      syncer::SyncDataLocal change_data(change.sync_data());
+      bool found = false;
+      for (auto&& data : data_list) {
+        syncer::SyncDataLocal local_data(data);
+        if (local_data.GetTag() == change_data.GetTag()) {
+          data = change.sync_data();
+          found = true;
+          break;
+        }
+      }
+      if (!found)
+        data_list.push_back(change_data);
+    }
+    return data_list;
+  }
+
+  syncer::SyncDataList ConvertToRemote(const syncer::SyncDataList& in) {
+    syncer::SyncDataList out;
+    for (auto& data : in) {
+      out.push_back(CreateRemoteData(data.GetSpecifics()));
+    }
+    return out;
+  }
+
  private:
   std::unique_ptr<syncer::FakeSyncClient> sync_client_;
   std::unique_ptr<SyncSessionsClientShim> sessions_client_shim_;
@@ -737,41 +778,6 @@
   std::unique_ptr<LocalDeviceInfoProviderMock> local_device_;
 };
 
-// Test that the SyncSessionManager can properly fill in a SessionHeader.
-TEST_F(SessionsSyncManagerTest, PopulateSessionHeader) {
-  sync_pb::SessionHeader header_s;
-  header_s.set_client_name("Client 1");
-  header_s.set_device_type(sync_pb::SyncEnums_DeviceType_TYPE_WIN);
-
-  SyncedSession session;
-  base::Time time = base::Time::Now();
-  SessionsSyncManager::PopulateSessionHeaderFromSpecifics(header_s, time,
-                                                          &session);
-  ASSERT_EQ("Client 1", session.session_name);
-  ASSERT_EQ(SyncedSession::TYPE_WIN, session.device_type);
-  ASSERT_EQ(time, session.modified_time);
-}
-
-// Test translation between protobuf types and chrome session types.
-TEST_F(SessionsSyncManagerTest, PopulateSessionWindow) {
-  sync_pb::SessionWindow window_s;
-  window_s.add_tab(0);
-  window_s.set_browser_type(sync_pb::SessionWindow_BrowserType_TYPE_TABBED);
-  window_s.set_selected_tab_index(1);
-
-  SyncedSession* session = manager()->session_tracker_.GetSession(kTag1);
-  manager()->session_tracker_.PutWindowInSession(kTag1, 0);
-  manager()->BuildSyncedSessionFromSpecifics(kTag1, window_s, base::Time(),
-                                             session->windows[0].get());
-  ASSERT_EQ(1U, session->windows[0]->wrapped_window.tabs.size());
-  ASSERT_EQ(1, session->windows[0]->wrapped_window.selected_tab_index);
-  ASSERT_EQ(sessions::SessionWindow::TYPE_TABBED,
-            session->windows[0]->wrapped_window.type);
-  ASSERT_EQ(1U, manager()->session_tracker_.num_synced_sessions());
-  ASSERT_EQ(1U, manager()->session_tracker_.num_synced_tabs(kTag1));
-}
-
-// Populate the fake tab delegate with some data and navigation
 // entries and make sure that setting a SessionTab from it preserves
 // those entries (and clobbers any existing data).
 TEST_F(SessionsSyncManagerTest, SetSessionTabFromDelegate) {
@@ -952,6 +958,117 @@
   EXPECT_TRUE(out[0].sync_data().GetSpecifics().session().has_header());
 }
 
+// Ensure that tabbed windows from a previous session are preserved if no
+// windows are present on startup.
+TEST_F(SessionsSyncManagerTest, PreserveTabbedDataNoWindows) {
+  syncer::SyncDataList in;
+  syncer::SyncChangeList out;
+
+  // Set up one tab and start sync with it.
+  TestSyncedTabDelegate* tab = AddTab(AddWindow()->GetSessionId(), kFoo1);
+  NavigateTab(tab, kFoo2);
+  InitWithSyncDataTakeOutput(in, &out);
+
+  // There should be two entities, a header and a tab.
+  in = GetDataFromChanges(out);
+  out.clear();
+  ASSERT_EQ(2U, in.size());
+
+  // Resync, using the previous sync data, but with no windows open now.
+  manager()->StopSyncing(syncer::SESSIONS);
+  ResetWindows();
+  InitWithSyncDataTakeOutput(ConvertToRemote(in), &out);
+
+  // There should be two changes: the rewritten tab (to update the tab id), and
+  // the rewritten header.
+  ASSERT_TRUE(ChangeTypeMatches(
+      out, {SyncChange::ACTION_UPDATE, SyncChange::ACTION_UPDATE}));
+  VerifyLocalTabChange(out[0], 2, kFoo2);
+  VerifyLocalHeaderChange(out[1], 1, 1);
+
+  // Verify the tab id of the restored tab is updated and consistent.
+  int restored_tab_id =
+      out[0].sync_data().GetSpecifics().session().tab().tab_id();
+  // SessionId should be rewritten on restore.
+  ASSERT_NE(tab->GetSessionId(), restored_tab_id);
+  ASSERT_EQ(
+      restored_tab_id,
+      out[1].sync_data().GetSpecifics().session().header().window(0).tab(0));
+}
+
+// Ensure that tabbed windows from a previous session are preserved if only
+// transient windows are present at startup.
+TEST_F(SessionsSyncManagerTest, PreserveTabbedDataCustomTab) {
+  syncer::SyncDataList in;
+  syncer::SyncChangeList out;
+
+  // Set up one tab and start sync with it.
+  TestSyncedWindowDelegate* window = AddWindow();
+  TestSyncedTabDelegate* tab = AddTab(window->GetSessionId(), kFoo1);
+  NavigateTab(tab, kFoo2);
+  InitWithSyncDataTakeOutput(in, &out);
+
+  // There should be two entities, a header and a tab.
+  in = GetDataFromChanges(out);
+  out.clear();
+  ASSERT_EQ(2U, in.size());
+
+  // Resync, using the previous sync data, but with only a custom tab open.
+  manager()->StopSyncing(syncer::SESSIONS);
+  window->OverrideWindowTypeToCustomTab();
+  SessionID new_window_id;
+  window->OverrideWindowId(new_window_id.id());
+  std::unique_ptr<TestSyncedTabDelegate> custom_tab =
+      base::MakeUnique<TestSyncedTabDelegate>();
+  NavigateTab(custom_tab.get(), kBar1);
+  window->OverrideTabAt(0, custom_tab.get());
+  InitWithSyncDataTakeOutput(ConvertToRemote(in), &out);
+
+  // The previous session should be preserved, and the transient window should
+  // be synced as a new transient window. This means that the original tab
+  // node will be updated with its new tab id, a new tab node will be created,
+  // and the header will be updated to reflect the two windows and two tabs.
+  ASSERT_TRUE(
+      ChangeTypeMatches(out, {SyncChange::ACTION_UPDATE, SyncChange::ACTION_ADD,
+                              SyncChange::ACTION_UPDATE}));
+  VerifyLocalTabChange(out[0], 2, kFoo2);
+  VerifyLocalTabChange(out[1], 1, kBar1);
+  VerifyLocalHeaderChange(out[2], 2, 2);
+
+  // The two windows should have different window types.
+  ASSERT_EQ(sync_pb::SessionWindow::TYPE_CUSTOM_TAB, out[2]
+                                                         .sync_data()
+                                                         .GetSpecifics()
+                                                         .session()
+                                                         .header()
+                                                         .window(0)
+                                                         .browser_type());
+  ASSERT_EQ(sync_pb::SessionWindow::TYPE_TABBED, out[2]
+                                                     .sync_data()
+                                                     .GetSpecifics()
+                                                     .session()
+                                                     .header()
+                                                     .window(1)
+                                                     .browser_type());
+
+  // Verify the tab id of the restored tab is updated and consistent.
+  int restored_tab_id =
+      out[0].sync_data().GetSpecifics().session().tab().tab_id();
+  // SessionId should be rewritten on restore.
+  ASSERT_NE(tab->GetSessionId(), restored_tab_id);
+  ASSERT_EQ(
+      restored_tab_id,
+      out[2].sync_data().GetSpecifics().session().header().window(1).tab(0));
+
+  // Verify the tab id of the custom tab is consistent.
+  int custom_tab_id =
+      out[1].sync_data().GetSpecifics().session().tab().tab_id();
+  ASSERT_EQ(custom_tab->GetSessionId(), custom_tab_id);
+  ASSERT_EQ(
+      custom_tab_id,
+      out[2].sync_data().GetSpecifics().session().header().window(0).tab(0));
+}
+
 // Tests MergeDataAndStartSyncing with sync data but no local data.
 TEST_F(SessionsSyncManagerTest, MergeWithInitialForeignSession) {
   std::vector<SessionID::id_type> tab_list1(std::begin(kTabIds1),
@@ -1582,9 +1699,9 @@
   sync_pb::SessionSpecifics new_tab(
       changes[1].sync_data().GetSpecifics().session());
   new_tab.set_tab_node_id(tab_node_id + 1);
-  in.push_back(CreateRemoteData(new_tab));  // New tab node.
   in.push_back(CreateRemoteData(
       changes[1].sync_data().GetSpecifics()));  // Old tab node.
+  in.push_back(CreateRemoteData(new_tab));      // New tab node.
   changes.clear();
 
   // Reassociate (with the same single tab/window open).
@@ -2396,12 +2513,12 @@
 
   // The tab entity will be overwritten twice. Once with the information for
   // tab 1 and then again with the information for tab 2. This will be followed
-  // by a header change reflecting both tabs.
+  // by a header change reflecting only the final tab.
   ASSERT_TRUE(
       ChangeTypeMatches(out,
                         {SyncChange::ACTION_UPDATE, SyncChange::ACTION_UPDATE,
                          SyncChange::ACTION_UPDATE}));
-  VerifyLocalHeaderChange(out[2], 2, 2);
+  VerifyLocalHeaderChange(out[2], 2, 1);
   VerifyLocalTabChange(out[0], 1, kFoo1);
   EXPECT_EQ(sync_id, out[0].sync_data().GetSpecifics().session().tab_node_id());
   EXPECT_EQ(tab1->GetSessionId(),
diff --git a/components/sync_sessions/synced_session_tracker.cc b/components/sync_sessions/synced_session_tracker.cc
index 94e6e9ff..1b61004 100644
--- a/components/sync_sessions/synced_session_tracker.cc
+++ b/components/sync_sessions/synced_session_tracker.cc
@@ -221,6 +221,12 @@
 
 void SyncedSessionTracker::PutWindowInSession(const std::string& session_tag,
                                               SessionID::id_type window_id) {
+  if (GetSession(session_tag)->windows.find(window_id) !=
+      GetSession(session_tag)->windows.end()) {
+    DVLOG(1) << "Window " << window_id << " already added to session "
+             << session_tag;
+    return;
+  }
   std::unique_ptr<SyncedSessionWindow> window;
 
   auto iter = unmapped_windows_[session_tag].find(window_id);
@@ -345,9 +351,7 @@
   return tab_ptr;
 }
 
-void SyncedSessionTracker::CleanupForeignSession(
-    const std::string& session_tag) {
-  DCHECK_NE(local_session_tag_, session_tag);
+void SyncedSessionTracker::CleanupSession(const std::string& session_tag) {
   CleanupSessionImpl(session_tag);
 }
 
@@ -365,13 +369,11 @@
 bool SyncedSessionTracker::GetTabNodeFromLocalTabId(SessionID::id_type tab_id,
                                                     int* tab_node_id) {
   DCHECK(!local_session_tag_.empty());
-  // Ensure a placeholder SessionTab is in place, if not already.
-  // Although we don't need a SessionTab to fulfill this request, this forces
-  // the
-  // creation of one if it doesn't already exist. This helps to make sure we're
-  // tracking this |tab_id| if |local_tab_pool_| is, and everyone's data
-  // structures
-  // are kept in sync and as consistent as possible.
+  // Ensure a placeholder SessionTab is in place, if not already. Although we
+  // don't need a SessionTab to fulfill this request, this forces the creation
+  // of one if it doesn't already exist. This helps to make sure we're tracking
+  // this |tab_id| if |local_tab_pool_| is, and everyone's data structures are
+  // kept in sync and as consistent as possible.
   GetTab(local_session_tag_, tab_id);  // Ignore result.
 
   bool reused_existing_tab =
diff --git a/components/sync_sessions/synced_session_tracker.h b/components/sync_sessions/synced_session_tracker.h
index 506d3d0..f032479 100644
--- a/components/sync_sessions/synced_session_tracker.h
+++ b/components/sync_sessions/synced_session_tracker.h
@@ -96,10 +96,15 @@
   // tabs not owned.
   void ResetSessionTracking(const std::string& session_tag);
 
+  // Deletes those windows and tabs associated with |session_tag| that are no
+  // longer owned. See ResetSessionTracking(...)..
+  void CleanupSession(const std::string& session_tag);
+
   // Adds the window with id |window_id| to the session specified by
   // |session_tag|. If none existed for that session, creates one. Similarly, if
   // the session did not exist yet, creates it. Ownership of the SessionWindow
   // remains within the SyncedSessionTracker.
+  // Attempting to add a window to a session multiple times will have no effect.
   void PutWindowInSession(const std::string& session_tag,
                           SessionID::id_type window_id);
 
@@ -145,10 +150,6 @@
   // Returns true if the session existed and was deleted, false otherwise.
   bool DeleteForeignSession(const std::string& session_tag);
 
-  // Deletes those windows and tabs associated with |session_tag| that are no
-  // longer owned. See ResetSessionTracking(...)..
-  void CleanupForeignSession(const std::string& session_tag);
-
   // **** Methods specific to the local session. ****
 
   // Set the local session tag. Must be called before any other local session
diff --git a/components/sync_sessions/synced_session_tracker_unittest.cc b/components/sync_sessions/synced_session_tracker_unittest.cc
index 9da19516..04cc0fd 100644
--- a/components/sync_sessions/synced_session_tracker_unittest.cc
+++ b/components/sync_sessions/synced_session_tracker_unittest.cc
@@ -61,6 +61,10 @@
   GetTracker()->PutWindowInSession(kTag, 0);
   SyncedSession* session = GetTracker()->GetSession(kTag);
   ASSERT_EQ(1U, session->windows.size());
+
+  // Doing it again should have no effect.
+  GetTracker()->PutWindowInSession(kTag, 0);
+  ASSERT_EQ(1U, session->windows.size());
   // Should clean up memory on its own.
 }
 
@@ -324,7 +328,7 @@
   // Window 1 was closed, along with tab 5.
   GetTracker()->PutTabInWindow(kTag, 0, 6);  // No longer unmapped.
   // Session 2 should not be affected.
-  GetTracker()->CleanupForeignSession(kTag);
+  GetTracker()->CleanupSession(kTag);
 
   // Verify that only those parts of the session not owned have been removed.
   ASSERT_EQ(1U, session1->windows.size());
@@ -560,4 +564,38 @@
   ASSERT_EQ(1U, GetTabNodePool()->Capacity());
 }
 
+TEST_F(SyncedSessionTrackerTest, ReassociateTabMapMismatch) {
+  std::set<int> free_node_ids;
+
+  // First create the old tab in an unmapped state.
+  GetTracker()->SetLocalSessionTag(kTag);
+  EXPECT_FALSE(GetTracker()->IsLocalTabNodeAssociated(kTabNode));
+  GetTracker()->ReassociateLocalTab(kTabNode, kTab1);
+  EXPECT_TRUE(GetTracker()->IsLocalTabNodeAssociated(kTabNode));
+  EXPECT_TRUE(GetTracker()->IsTabUnmappedForTesting(kTab1));
+
+  // Map an unseen tab to a window, then reassociate the existing tab to the
+  // mapped tab id.
+  GetTracker()->ResetSessionTracking(kTag);
+  EXPECT_TRUE(GetTracker()->IsLocalTabNodeAssociated(kTabNode));
+  GetTracker()->PutWindowInSession(kTag, kWindow1);
+  GetTracker()->PutTabInWindow(kTag, kWindow1, kTab2);
+  GetTracker()->CleanupLocalTabs(&free_node_ids);
+  EXPECT_FALSE(GetTracker()->IsTabUnmappedForTesting(kTab1));
+  EXPECT_FALSE(GetTracker()->IsTabUnmappedForTesting(kTab2));
+  GetTracker()->ReassociateLocalTab(kTabNode, kTab2);
+  EXPECT_TRUE(free_node_ids.empty());
+  EXPECT_FALSE(GetTracker()->IsTabUnmappedForTesting(kTab1));
+  EXPECT_FALSE(GetTracker()->IsTabUnmappedForTesting(kTab2));
+
+  // Now that it's been mapped, it should be accessible both via the
+  // GetSession as well as GetTab.
+  SyncedSession* session = GetTracker()->GetSession(kTag);
+  ASSERT_EQ(GetTracker()->GetTab(kTag, kTab2),
+            session->windows[kWindow1]->wrapped_window.tabs[0].get());
+  ASSERT_EQ(session->tab_node_ids.size(),
+            session->tab_node_ids.count(kTabNode));
+  ASSERT_EQ(1U, GetTabNodePool()->Capacity());
+}
+
 }  // namespace sync_sessions
diff --git a/content/browser/DEPS b/content/browser/DEPS
index 84b453a3..391e781 100644
--- a/content/browser/DEPS
+++ b/content/browser/DEPS
@@ -66,8 +66,6 @@
   "+third_party/WebKit/public/platform/WebDragOperation.h",
   "+third_party/WebKit/public/platform/WebFeaturePolicy.h",
   "+third_party/WebKit/public/platform/WebFocusType.h",
-  "+third_party/WebKit/public/platform/WebGamepad.h",
-  "+third_party/WebKit/public/platform/WebGamepads.h",
   "+third_party/WebKit/public/platform/WebGestureEvent.h",
   "+third_party/WebKit/public/platform/WebInputEvent.h",
   "+third_party/WebKit/public/platform/WebInsecureRequestPolicy.h",
diff --git a/content/browser/child_process_launcher_helper_android.cc b/content/browser/child_process_launcher_helper_android.cc
index e6e9341a..a46f2c4 100644
--- a/content/browser/child_process_launcher_helper_android.cc
+++ b/content/browser/child_process_launcher_helper_android.cc
@@ -34,6 +34,7 @@
 
 // Stops a child process based on the handle returned from StartChildProcess.
 void StopChildProcess(base::ProcessHandle handle) {
+  DCHECK_CURRENTLY_ON(BrowserThread::PROCESS_LAUNCHER);
   JNIEnv* env = AttachCurrentThread();
   DCHECK(env);
   Java_ChildProcessLauncherHelper_stop(env, static_cast<jint>(handle));
@@ -159,7 +160,8 @@
 // static
 bool ChildProcessLauncherHelper::TerminateProcess(
     const base::Process& process, int exit_code, bool wait) {
-  StopChildProcess(process.Handle());
+  BrowserThread::PostTask(BrowserThread::PROCESS_LAUNCHER, FROM_HERE,
+                          base::Bind(&StopChildProcess, process.Handle()));
   return true;
 }
 
diff --git a/content/browser/renderer_host/pepper/pepper_gamepad_host.h b/content/browser/renderer_host/pepper/pepper_gamepad_host.h
index 6cc2422..c341091f 100644
--- a/content/browser/renderer_host/pepper/pepper_gamepad_host.h
+++ b/content/browser/renderer_host/pepper/pepper_gamepad_host.h
@@ -51,9 +51,9 @@
 
   // GamepadConsumer implementation.
   void OnGamepadConnected(unsigned index,
-                          const blink::WebGamepad& gamepad) override {}
+                          const device::Gamepad& gamepad) override {}
   void OnGamepadDisconnected(unsigned index,
-                             const blink::WebGamepad& gamepad) override {}
+                             const device::Gamepad& gamepad) override {}
 
  private:
   int32_t OnRequestMemory(ppapi::host::HostMessageContext* context);
diff --git a/content/browser/renderer_host/pepper/pepper_gamepad_host_unittest.cc b/content/browser/renderer_host/pepper/pepper_gamepad_host_unittest.cc
index 472a1a7..fa5ef9ee 100644
--- a/content/browser/renderer_host/pepper/pepper_gamepad_host_unittest.cc
+++ b/content/browser/renderer_host/pepper/pepper_gamepad_host_unittest.cc
@@ -34,7 +34,7 @@
   PepperGamepadHostTest() {}
   ~PepperGamepadHostTest() override {}
 
-  void ConstructService(const blink::WebGamepads& test_data) {
+  void ConstructService(const device::Gamepads& test_data) {
     service_.reset(new device::GamepadServiceTestConstructor(test_data));
   }
 
@@ -72,13 +72,13 @@
 
 TEST_F(PepperGamepadHostTest, ValidateGamepadsMatch) {
   // Gamepads.
-  static_assert(sizeof(ppapi::WebKitGamepads) == sizeof(blink::WebGamepads),
+  static_assert(sizeof(ppapi::WebKitGamepads) == sizeof(device::Gamepads),
                 "gamepads data must match");
   ppapi::WebKitGamepads ppapi_gamepads;
-  blink::WebGamepads web_gamepads;
+  device::Gamepads web_gamepads;
 
   // See comment below on storage & the EXPECT macro.
-  size_t webkit_items_length_cap = blink::WebGamepads::kItemsLengthCap;
+  size_t webkit_items_length_cap = device::Gamepads::kItemsLengthCap;
   size_t ppapi_items_length_cap = ppapi::WebKitGamepads::kItemsLengthCap;
   EXPECT_EQ(webkit_items_length_cap, ppapi_items_length_cap);
 
@@ -90,23 +90,23 @@
 
 TEST_F(PepperGamepadHostTest, ValidateGamepadMatch) {
   // Gamepad.
-  static_assert(sizeof(ppapi::WebKitGamepad) == sizeof(blink::WebGamepad),
+  static_assert(sizeof(ppapi::WebKitGamepad) == sizeof(device::Gamepad),
                 "gamepad data must match");
   ppapi::WebKitGamepad ppapi_gamepad;
-  blink::WebGamepad web_gamepad;
+  device::Gamepad web_gamepad;
 
   // Using EXPECT seems to force storage for the parameter, which the constants
   // in the WebKit/PPAPI headers don't have. So we have to use temporaries
   // before comparing them.
-  size_t webkit_id_length_cap = blink::WebGamepad::kIdLengthCap;
+  size_t webkit_id_length_cap = device::Gamepad::kIdLengthCap;
   size_t ppapi_id_length_cap = ppapi::WebKitGamepad::kIdLengthCap;
   EXPECT_EQ(webkit_id_length_cap, ppapi_id_length_cap);
 
-  size_t webkit_axes_length_cap = blink::WebGamepad::kAxesLengthCap;
+  size_t webkit_axes_length_cap = device::Gamepad::kAxesLengthCap;
   size_t ppapi_axes_length_cap = ppapi::WebKitGamepad::kAxesLengthCap;
   EXPECT_EQ(webkit_axes_length_cap, ppapi_axes_length_cap);
 
-  size_t webkit_buttons_length_cap = blink::WebGamepad::kButtonsLengthCap;
+  size_t webkit_buttons_length_cap = device::Gamepad::kButtonsLengthCap;
   size_t ppapi_buttons_length_cap = ppapi::WebKitGamepad::kButtonsLengthCap;
   EXPECT_EQ(webkit_buttons_length_cap, ppapi_buttons_length_cap);
 
@@ -127,8 +127,8 @@
 }
 
 TEST_F(PepperGamepadHostTest, WaitForReply) {
-  blink::WebGamepads default_data;
-  memset(&default_data, 0, sizeof(blink::WebGamepads));
+  device::Gamepads default_data;
+  memset(&default_data, 0, sizeof(device::Gamepads));
   default_data.items[0].connected = true;
   default_data.items[0].buttons_length = 1;
   ConstructService(default_data);
@@ -153,7 +153,7 @@
   EXPECT_EQ(0u, sink().message_count());
 
   // Set a button down and wait for it to be read twice.
-  blink::WebGamepads button_down_data = default_data;
+  device::Gamepads button_down_data = default_data;
   button_down_data.items[0].buttons[0].value = 1.f;
   button_down_data.items[0].buttons[0].pressed = true;
   fetcher->SetTestData(button_down_data);
diff --git a/content/common/DEPS b/content/common/DEPS
index 48fd8c4..78ec7ec7 100644
--- a/content/common/DEPS
+++ b/content/common/DEPS
@@ -19,8 +19,6 @@
   "+third_party/WebKit/public/platform/WebFloatPoint.h",
   "+third_party/WebKit/public/platform/WebFloatRect.h",
   "+third_party/WebKit/public/platform/WebFocusType.h",
-  "+third_party/WebKit/public/platform/WebGamepad.h",
-  "+third_party/WebKit/public/platform/WebGamepads.h",
   "+third_party/WebKit/public/platform/WebGestureEvent.h",
   "+third_party/WebKit/public/platform/WebHTTPBody.h",
   "+third_party/WebKit/public/platform/WebHistoryScrollRestorationType.h",
diff --git a/content/public/android/java/src/org/chromium/content/browser/ChildConnectionAllocator.java b/content/public/android/java/src/org/chromium/content/browser/ChildConnectionAllocator.java
index 2587232..56230dda 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ChildConnectionAllocator.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ChildConnectionAllocator.java
@@ -13,16 +13,15 @@
 
 import org.chromium.base.Log;
 import org.chromium.base.VisibleForTesting;
+import org.chromium.base.annotations.SuppressFBWarnings;
 import org.chromium.content.app.PrivilegedProcessService;
 import org.chromium.content.app.SandboxedProcessService;
 
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.Map;
 import java.util.Queue;
-import java.util.concurrent.ConcurrentHashMap;
-
-import javax.annotation.concurrent.GuardedBy;
 
 /**
  * This class is responsible for allocating and managing connections to child
@@ -39,14 +38,10 @@
     private static final String SANDBOXED_SERVICES_NAME_KEY =
             "org.chromium.content.browser.SANDBOXED_SERVICES_NAME";
 
-    private static final Object sAllocatorLock = new Object();
-
     // Map from package name to ChildConnectionAllocator.
-    @GuardedBy("sAllocatorLock")
     private static Map<String, ChildConnectionAllocator> sSandboxedChildConnectionAllocatorMap;
 
     // Allocator used for non-sandboxed services.
-    @GuardedBy("sAllocatorLock")
     private static ChildConnectionAllocator sPrivilegedChildConnectionAllocator;
 
     // Used by test to override the default sandboxed service settings.
@@ -59,47 +54,42 @@
     private final String mChildClassName;
     private final boolean mInSandbox;
 
-    private final Object mConnectionLock = new Object();
-
     // The list of free (not bound) service indices.
-    @GuardedBy("mConnectionLock")
     private final ArrayList<Integer> mFreeConnectionIndices;
 
     // Each Allocator keeps a queue for the pending spawn data. Once a connection is free, we
     // dequeue the pending spawn data from the same allocator as the connection.
-    @GuardedBy("mConnectionLock")
     private final Queue<ChildSpawnData> mPendingSpawnQueue = new LinkedList<>();
 
+    @SuppressFBWarnings("LI_LAZY_INIT_STATIC") // Method is single thread.
     public static ChildConnectionAllocator getAllocator(
             Context context, String packageName, boolean inSandbox) {
-        synchronized (sAllocatorLock) {
-            if (!inSandbox) {
-                if (sPrivilegedChildConnectionAllocator == null) {
-                    sPrivilegedChildConnectionAllocator = new ChildConnectionAllocator(false,
-                            getNumberOfServices(context, false, packageName),
-                            getClassNameOfService(context, false, packageName));
-                }
-                return sPrivilegedChildConnectionAllocator;
+        assert LauncherThread.runningOnLauncherThread();
+        if (!inSandbox) {
+            if (sPrivilegedChildConnectionAllocator == null) {
+                sPrivilegedChildConnectionAllocator = new ChildConnectionAllocator(false,
+                        getNumberOfServices(context, false, packageName),
+                        getClassNameOfService(context, false, packageName));
             }
-
-            if (sSandboxedChildConnectionAllocatorMap == null) {
-                sSandboxedChildConnectionAllocatorMap =
-                        new ConcurrentHashMap<String, ChildConnectionAllocator>();
-            }
-            if (!sSandboxedChildConnectionAllocatorMap.containsKey(packageName)) {
-                Log.w(TAG,
-                        "Create a new ChildConnectionAllocator with package name = %s,"
-                                + " inSandbox = true",
-                        packageName);
-                sSandboxedChildConnectionAllocatorMap.put(packageName,
-                        new ChildConnectionAllocator(true,
-                                getNumberOfServices(context, true, packageName),
-                                getClassNameOfService(context, true, packageName)));
-            }
-            return sSandboxedChildConnectionAllocatorMap.get(packageName);
-            // TODO(pkotwicz|hanxi): Figure out when old allocators should be removed from
-            // {@code sSandboxedChildConnectionAllocatorMap}.
+            return sPrivilegedChildConnectionAllocator;
         }
+
+        if (sSandboxedChildConnectionAllocatorMap == null) {
+            sSandboxedChildConnectionAllocatorMap = new HashMap<String, ChildConnectionAllocator>();
+        }
+        if (!sSandboxedChildConnectionAllocatorMap.containsKey(packageName)) {
+            Log.w(TAG,
+                    "Create a new ChildConnectionAllocator with package name = %s,"
+                            + " inSandbox = true",
+                    packageName);
+            sSandboxedChildConnectionAllocatorMap.put(packageName,
+                    new ChildConnectionAllocator(true,
+                            getNumberOfServices(context, true, packageName),
+                            getClassNameOfService(context, true, packageName)));
+        }
+        return sSandboxedChildConnectionAllocatorMap.get(packageName);
+        // TODO(pkotwicz|hanxi): Figure out when old allocators should be removed from
+        // {@code sSandboxedChildConnectionAllocatorMap}.
     }
 
     private static String getClassNameOfService(
@@ -185,60 +175,56 @@
     public ChildProcessConnection allocate(ChildSpawnData spawnData,
             ChildProcessConnection.DeathCallback deathCallback, Bundle childProcessCommonParameters,
             boolean queueIfNoSlotAvailable) {
+        assert LauncherThread.runningOnLauncherThread();
         assert spawnData.isInSandbox() == mInSandbox;
-        synchronized (mConnectionLock) {
-            if (mFreeConnectionIndices.isEmpty()) {
-                Log.d(TAG, "Ran out of services to allocate.");
-                if (queueIfNoSlotAvailable) {
-                    mPendingSpawnQueue.add(spawnData);
-                }
-                return null;
+        if (mFreeConnectionIndices.isEmpty()) {
+            Log.d(TAG, "Ran out of services to allocate.");
+            if (queueIfNoSlotAvailable) {
+                mPendingSpawnQueue.add(spawnData);
             }
-            int slot = mFreeConnectionIndices.remove(0);
-            assert mChildProcessConnections[slot] == null;
-            mChildProcessConnections[slot] = new ChildProcessConnectionImpl(spawnData.getContext(),
-                    slot, mInSandbox, deathCallback, mChildClassName, childProcessCommonParameters,
-                    spawnData.isAlwaysInForeground(), spawnData.getCreationParams());
-            Log.d(TAG, "Allocator allocated a connection, sandbox: %b, slot: %d", mInSandbox, slot);
-            return mChildProcessConnections[slot];
+            return null;
         }
+        int slot = mFreeConnectionIndices.remove(0);
+        assert mChildProcessConnections[slot] == null;
+        mChildProcessConnections[slot] = new ChildProcessConnectionImpl(spawnData.getContext(),
+                slot, mInSandbox, deathCallback, mChildClassName, childProcessCommonParameters,
+                spawnData.isAlwaysInForeground(), spawnData.getCreationParams());
+        Log.d(TAG, "Allocator allocated a connection, sandbox: %b, slot: %d", mInSandbox, slot);
+        return mChildProcessConnections[slot];
     }
 
     // Also return the first ChildSpawnData in the pending queue, if any.
     public ChildSpawnData free(ChildProcessConnection connection) {
-        synchronized (mConnectionLock) {
-            int slot = connection.getServiceNumber();
-            if (mChildProcessConnections[slot] != connection) {
-                int occupier = mChildProcessConnections[slot] == null
-                        ? -1
-                        : mChildProcessConnections[slot].getServiceNumber();
-                Log.e(TAG,
-                        "Unable to find connection to free in slot: %d "
-                                + "already occupied by service: %d",
-                        slot, occupier);
-                assert false;
-            } else {
-                mChildProcessConnections[slot] = null;
-                assert !mFreeConnectionIndices.contains(slot);
-                mFreeConnectionIndices.add(slot);
-                Log.d(TAG, "Allocator freed a connection, sandbox: %b, slot: %d", mInSandbox, slot);
-            }
-            return mPendingSpawnQueue.poll();
+        assert LauncherThread.runningOnLauncherThread();
+        int slot = connection.getServiceNumber();
+        if (mChildProcessConnections[slot] != connection) {
+            int occupier = mChildProcessConnections[slot] == null
+                    ? -1
+                    : mChildProcessConnections[slot].getServiceNumber();
+            Log.e(TAG,
+                    "Unable to find connection to free in slot: %d "
+                            + "already occupied by service: %d",
+                    slot, occupier);
+            assert false;
+        } else {
+            mChildProcessConnections[slot] = null;
+            assert !mFreeConnectionIndices.contains(slot);
+            mFreeConnectionIndices.add(slot);
+            Log.d(TAG, "Allocator freed a connection, sandbox: %b, slot: %d", mInSandbox, slot);
         }
+        return mPendingSpawnQueue.poll();
     }
 
     public boolean isFreeConnectionAvailable() {
-        synchronized (mConnectionLock) {
-            return !mFreeConnectionIndices.isEmpty();
-        }
+        assert LauncherThread.runningOnLauncherThread();
+        return !mFreeConnectionIndices.isEmpty();
     }
 
     /** @return the count of connections managed by the allocator */
     @VisibleForTesting
     int allocatedConnectionsCountForTesting() {
-        synchronized (mConnectionLock) {
-            return mChildProcessConnections.length - mFreeConnectionIndices.size();
-        }
+        assert LauncherThread.runningOnLauncherThread();
+        return mChildProcessConnections.length - mFreeConnectionIndices.size();
     }
 
     @VisibleForTesting
@@ -248,15 +234,13 @@
 
     @VisibleForTesting
     void enqueuePendingQueueForTesting(ChildSpawnData spawnData) {
-        synchronized (mConnectionLock) {
-            mPendingSpawnQueue.add(spawnData);
-        }
+        assert LauncherThread.runningOnLauncherThread();
+        mPendingSpawnQueue.add(spawnData);
     }
 
     @VisibleForTesting
     int pendingSpawnsCountForTesting() {
-        synchronized (mConnectionLock) {
-            return mPendingSpawnQueue.size();
-        }
+        assert LauncherThread.runningOnLauncherThread();
+        return mPendingSpawnQueue.size();
     }
 }
diff --git a/content/public/android/java/src/org/chromium/content/browser/ChildProcessConnection.java b/content/public/android/java/src/org/chromium/content/browser/ChildProcessConnection.java
index 0a22ed6..79bb922 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ChildProcessConnection.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ChildProcessConnection.java
@@ -25,6 +25,7 @@
      * fully set up.
      */
     interface DeathCallback {
+        // Called on Launcher thread.
         void onChildProcessDied(ChildProcessConnection connection);
     }
 
diff --git a/content/public/android/java/src/org/chromium/content/browser/ChildProcessConnectionImpl.java b/content/public/android/java/src/org/chromium/content/browser/ChildProcessConnectionImpl.java
index de8e0f34..710741b 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ChildProcessConnectionImpl.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ChildProcessConnectionImpl.java
@@ -16,7 +16,6 @@
 import android.os.RemoteException;
 
 import org.chromium.base.Log;
-import org.chromium.base.ThreadUtils;
 import org.chromium.base.TraceEvent;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.process_launcher.ChildProcessCreationParams;
@@ -160,83 +159,24 @@
         }
 
         @Override
-        public void onServiceConnected(ComponentName className, IBinder service) {
-            synchronized (mLock) {
-                // A flag from the parent class ensures we run the post-connection logic only once
-                // (instead of once per each ChildServiceConnection).
-                if (mDidOnServiceConnected) {
-                    return;
+        public void onServiceConnected(ComponentName className, final IBinder service) {
+            LauncherThread.post(new Runnable() {
+                @Override
+                public void run() {
+                    ChildProcessConnectionImpl.this.onServiceConnectedOnLauncherThread(service);
                 }
-                try {
-                    TraceEvent.begin(
-                            "ChildProcessConnectionImpl.ChildServiceConnection.onServiceConnected");
-                    mDidOnServiceConnected = true;
-                    mService = IChildProcessService.Stub.asInterface(service);
-
-                    StartCallback startCallback = mStartCallback;
-                    mStartCallback = null;
-
-                    final boolean bindCheck =
-                            mCreationParams != null && mCreationParams.getBindToCallerCheck();
-                    boolean boundToUs = false;
-                    try {
-                        boundToUs = bindCheck ? mService.bindToCaller() : true;
-                    } catch (RemoteException ex) {
-                        // Do not trigger the StartCallback here, since the service is already
-                        // dead and the DeathCallback will run from onServiceDisconnected().
-                        Log.e(TAG, "Failed to bind service to connection.", ex);
-                        return;
-                    }
-
-                    if (startCallback != null) {
-                        if (boundToUs) {
-                            startCallback.onChildStarted();
-                        } else {
-                            startCallback.onChildStartFailed();
-                        }
-                    }
-
-                    if (!boundToUs) {
-                        return;
-                    }
-
-                    mServiceConnectComplete = true;
-
-                    // Run the setup if the connection parameters have already been provided. If
-                    // not, doConnectionSetupLocked() will be called from setupConnection().
-                    if (mConnectionParams != null) {
-                        doConnectionSetupLocked();
-                    }
-                } finally {
-                    TraceEvent.end(
-                            "ChildProcessConnectionImpl.ChildServiceConnection.onServiceConnected");
-                }
-            }
+            });
         }
 
-
         // Called on the main thread to notify that the child service did not disconnect gracefully.
         @Override
         public void onServiceDisconnected(ComponentName className) {
-            synchronized (mLock) {
-                // Ensure that the disconnection logic runs only once (instead of once per each
-                // ChildServiceConnection).
-                if (mServiceDisconnected) {
-                    return;
+            LauncherThread.post(new Runnable() {
+                @Override
+                public void run() {
+                    ChildProcessConnectionImpl.this.onServiceDisconnectedOnLauncherThread();
                 }
-                // Stash the status of the oom bindings, since stop() will release all bindings.
-                mWasOomProtected = isCurrentlyOomProtected();
-                mServiceDisconnected = true;
-                Log.w(TAG, "onServiceDisconnected (crash or killed by oom): pid=%d", mPid);
-                stop();  // We don't want to auto-restart on crash. Let the browser do that.
-                mDeathCallback.onChildProcessDied(ChildProcessConnectionImpl.this);
-                // If we have a pending connection callback, we need to communicate the failure to
-                // the caller.
-                if (mConnectionCallback != null) {
-                    mConnectionCallback.onConnected(0);
-                }
-                mConnectionCallback = null;
-            }
+            });
         }
     }
 
@@ -329,8 +269,8 @@
     public void start(ChildProcessConnection.StartCallback startCallback) {
         try {
             TraceEvent.begin("ChildProcessConnectionImpl.start");
+            assert LauncherThread.runningOnLauncherThread();
             synchronized (mLock) {
-                assert !ThreadUtils.runningOnUiThread();
                 assert mConnectionParams == null :
                         "setupConnection() called before start() in ChildProcessConnectionImpl.";
 
@@ -353,6 +293,7 @@
     @Override
     public void setupConnection(String[] commandLine, FileDescriptorInfo[] filesToBeMapped,
             @Nullable IBinder callback, ConnectionCallback connectionCallback) {
+        assert LauncherThread.runningOnLauncherThread();
         synchronized (mLock) {
             assert mConnectionParams == null;
             if (mServiceDisconnected) {
@@ -390,6 +331,84 @@
         }
     }
 
+    private void onServiceConnectedOnLauncherThread(IBinder service) {
+        assert LauncherThread.runningOnLauncherThread();
+        synchronized (mLock) {
+            // A flag from the parent class ensures we run the post-connection logic only once
+            // (instead of once per each ChildServiceConnection).
+            if (mDidOnServiceConnected) {
+                return;
+            }
+            try {
+                TraceEvent.begin(
+                        "ChildProcessConnectionImpl.ChildServiceConnection.onServiceConnected");
+                mDidOnServiceConnected = true;
+                mService = IChildProcessService.Stub.asInterface(service);
+
+                StartCallback startCallback = mStartCallback;
+                mStartCallback = null;
+
+                final boolean bindCheck =
+                        mCreationParams != null && mCreationParams.getBindToCallerCheck();
+                boolean boundToUs = false;
+                try {
+                    boundToUs = bindCheck ? mService.bindToCaller() : true;
+                } catch (RemoteException ex) {
+                    // Do not trigger the StartCallback here, since the service is already
+                    // dead and the DeathCallback will run from onServiceDisconnected().
+                    Log.e(TAG, "Failed to bind service to connection.", ex);
+                    return;
+                }
+
+                if (startCallback != null) {
+                    if (boundToUs) {
+                        startCallback.onChildStarted();
+                    } else {
+                        startCallback.onChildStartFailed();
+                    }
+                }
+
+                if (!boundToUs) {
+                    return;
+                }
+
+                mServiceConnectComplete = true;
+
+                // Run the setup if the connection parameters have already been provided. If
+                // not, doConnectionSetupLocked() will be called from setupConnection().
+                if (mConnectionParams != null) {
+                    doConnectionSetupLocked();
+                }
+            } finally {
+                TraceEvent.end(
+                        "ChildProcessConnectionImpl.ChildServiceConnection.onServiceConnected");
+            }
+        }
+    }
+
+    private void onServiceDisconnectedOnLauncherThread() {
+        assert LauncherThread.runningOnLauncherThread();
+        synchronized (mLock) {
+            // Ensure that the disconnection logic runs only once (instead of once per each
+            // ChildServiceConnection).
+            if (mServiceDisconnected) {
+                return;
+            }
+            // Stash the status of the oom bindings, since stop() will release all bindings.
+            mWasOomProtected = isCurrentlyOomProtected();
+            mServiceDisconnected = true;
+            Log.w(TAG, "onServiceDisconnected (crash or killed by oom): pid=%d", mPid);
+            stop(); // We don't want to auto-restart on crash. Let the browser do that.
+            mDeathCallback.onChildProcessDied(ChildProcessConnectionImpl.this);
+            // If we have a pending connection callback, we need to communicate the failure to
+            // the caller.
+            if (mConnectionCallback != null) {
+                mConnectionCallback.onConnected(0);
+            }
+            mConnectionCallback = null;
+        }
+    }
+
     private void onSetupConnectionResult(int pid) {
         synchronized (mLock) {
             mPid = pid;
diff --git a/content/public/android/java/src/org/chromium/content/browser/ChildProcessLauncher.java b/content/public/android/java/src/org/chromium/content/browser/ChildProcessLauncher.java
index a4d02a0a..1336d3df 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ChildProcessLauncher.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ChildProcessLauncher.java
@@ -43,10 +43,12 @@
     @VisibleForTesting
     static ChildProcessConnection allocateConnection(
             ChildSpawnData spawnData, Bundle childProcessCommonParams, boolean forWarmUp) {
+        assert LauncherThread.runningOnLauncherThread();
         ChildProcessConnection.DeathCallback deathCallback =
                 new ChildProcessConnection.DeathCallback() {
                     @Override
                     public void onChildProcessDied(ChildProcessConnection connection) {
+                        assert LauncherThread.runningOnLauncherThread();
                         if (connection.getPid() != 0) {
                             stop(connection.getPid());
                         } else {
@@ -133,9 +135,8 @@
     private static final long FREE_CONNECTION_DELAY_MILLIS = 1;
 
     private static void freeConnection(ChildProcessConnection connection) {
-        synchronized (sSpareConnectionLock) {
-            if (connection.equals(sSpareSandboxedConnection)) sSpareSandboxedConnection = null;
-        }
+        assert LauncherThread.runningOnLauncherThread();
+        if (connection == sSpareSandboxedConnection) clearSpareConnection();
 
         // Freeing a service should be delayed. This is so that we avoid immediately reusing the
         // freed service (see http://crbug.com/164069): the framework might keep a service process
@@ -143,10 +144,19 @@
         // is bound at that point, the process is reused and bad things happen (mostly static
         // variables are set when we don't expect them to).
         final ChildProcessConnection conn = connection;
-        ThreadUtils.postOnUiThreadDelayed(new Runnable() {
+        LauncherThread.postDelayed(new Runnable() {
             @Override
             public void run() {
-                final ChildSpawnData pendingSpawn = freeConnectionAndDequeuePending(conn);
+                // TODO(jcivelli): it should be safe to pass a null Context here as it is used to
+                // initialize the ChildConnectionAllocator object and if we are freeing a
+                // connection, we must have allocated one previously guaranteeing it is already
+                // initialized. When we consolidate ChildProcessLauncher and
+                // ChildProcessLauncherHelper, we'll have a context around that we can pass in
+                // there.
+                ChildConnectionAllocator allocator = ChildConnectionAllocator.getAllocator(
+                        null /* context */, conn.getPackageName(), conn.isInSandbox());
+                assert allocator != null;
+                final ChildSpawnData pendingSpawn = allocator.free(conn);
                 if (pendingSpawn != null) {
                     LauncherThread.post(new Runnable() {
                         @Override
@@ -165,18 +175,6 @@
         }, FREE_CONNECTION_DELAY_MILLIS);
     }
 
-    private static ChildSpawnData freeConnectionAndDequeuePending(ChildProcessConnection conn) {
-        // TODO(jcivelli): it should be safe to pass a null Context here as it is used to initialize
-        // the ChildConnectionAllocator object and if we are freeing a connection, we must have
-        // allocated one previously guaranteeing it is already initialized.
-        // When we consolidate ChildProcessLauncher and ChildProcessLauncherHelper, we'll have a
-        // context around that we can pass in there.
-        ChildConnectionAllocator allocator = ChildConnectionAllocator.getAllocator(
-                null /* context */, conn.getPackageName(), conn.isInSandbox());
-        assert allocator != null;
-        return allocator.free(conn);
-    }
-
     // Represents an invalid process handle; same as base/process/process.h kNullProcessHandle.
     private static final int NULL_PROCESS_HANDLE = 0;
 
@@ -184,16 +182,16 @@
     private static Map<Integer, ChildProcessConnection> sServiceMap =
             new ConcurrentHashMap<Integer, ChildProcessConnection>();
 
-    // Lock and monitor for these members {{{
-    private static final Object sSpareConnectionLock = new Object();
-    // A pre-allocated and pre-bound connection ready for connection setup, or null.
+    // These variables are used for the warm up sandboxed connection.
+    // |sSpareSandboxedConnection| is non-null when there is a pending connection. Note it's cleared
+    // to null again after the connection is used for a real child process.
+    // |sSpareConnectionStarting| is true if ChildProcessConnection.StartCallback has not fired.
+    // This is used for a child process allocation to determine if StartCallback should be chained.
+    // |sSpareConnectionStartCallback| is the chained StartCallback. This is also used to determine
+    // if there is already a child process launch that's used this this connection.
     private static ChildProcessConnection sSpareSandboxedConnection;
-    // If sSpareSandboxedConnection is not null, this indicates whether the service is
-    // ready for connection setup. Wait on the monitor lock to be notified when this
-    // state changes. sSpareSandboxedConnection may be null after waiting, if starting
-    // the service failed.
     private static boolean sSpareConnectionStarting;
-    // }}}
+    private static ChildProcessConnection.StartCallback sSpareConnectionStartCallback;
 
     // Manages oom bindings used to bind chind services.
     private static BindingManager sBindingManager = BindingManagerImpl.createBindingManager();
@@ -268,44 +266,52 @@
         LauncherThread.post(new Runnable() {
             @Override
             public void run() {
-                synchronized (sSpareConnectionLock) {
-                    if (sSpareSandboxedConnection == null) {
-                        ChildProcessCreationParams params = ChildProcessCreationParams.getDefault();
-                        sSpareConnectionStarting = true;
+                if (sSpareSandboxedConnection != null) return;
+                ChildProcessCreationParams params = ChildProcessCreationParams.getDefault();
 
-                        ChildProcessConnection.StartCallback startCallback =
-                                new ChildProcessConnection.StartCallback() {
-                                    @Override
-                                    public void onChildStarted() {
-                                        synchronized (sSpareConnectionLock) {
-                                            sSpareConnectionStarting = false;
-                                            sSpareConnectionLock.notify();
-                                        }
-                                    }
+                ChildProcessConnection.StartCallback startCallback =
+                        new ChildProcessConnection.StartCallback() {
+                            @Override
+                            public void onChildStarted() {
+                                assert LauncherThread.runningOnLauncherThread();
+                                sSpareConnectionStarting = false;
+                                if (sSpareConnectionStartCallback != null) {
+                                    sSpareConnectionStartCallback.onChildStarted();
+                                    clearSpareConnection();
+                                }
+                                // If there is no chained callback, that means nothing has tried to
+                                // use the spare connection yet. It will be cleared when it is used
+                                // for an actual child process launch.
+                            }
 
-                                    @Override
-                                    public void onChildStartFailed() {
-                                        Log.e(TAG, "Failed to warm up the spare sandbox service");
-                                        synchronized (sSpareConnectionLock) {
-                                            sSpareSandboxedConnection = null;
-                                            sSpareConnectionStarting = false;
-                                            sSpareConnectionLock.notify();
-                                        }
-                                    }
-                                };
-                        ChildSpawnData spawnData = new ChildSpawnData(context,
-                                null /* commandLine */, -1 /* child process id */,
-                                null /* filesToBeMapped */, null /* launchCallback */,
-                                null /* child process callback */, true /* inSandbox */,
-                                SPARE_CONNECTION_ALWAYS_IN_FOREGROUND, params);
-                        sSpareSandboxedConnection = allocateBoundConnection(
-                                spawnData, startCallback, true /* forWarmUp */);
-                    }
-                }
+                            @Override
+                            public void onChildStartFailed() {
+                                assert LauncherThread.runningOnLauncherThread();
+                                Log.e(TAG, "Failed to warm up the spare sandbox service");
+                                if (sSpareConnectionStartCallback != null) {
+                                    sSpareConnectionStartCallback.onChildStartFailed();
+                                }
+                                clearSpareConnection();
+                            }
+                        };
+                ChildSpawnData spawnData = new ChildSpawnData(context, null /* commandLine */,
+                        -1 /* child process id */, null /* filesToBeMapped */,
+                        null /* launchCallback */, null /* child process callback */,
+                        true /* inSandbox */, SPARE_CONNECTION_ALWAYS_IN_FOREGROUND, params);
+                sSpareSandboxedConnection =
+                        allocateBoundConnection(spawnData, startCallback, true /* forWarmUp */);
+                sSpareConnectionStarting = sSpareSandboxedConnection != null;
             }
         });
     }
 
+    private static void clearSpareConnection() {
+        assert LauncherThread.runningOnLauncherThread();
+        sSpareSandboxedConnection = null;
+        sSpareConnectionStarting = false;
+        sSpareConnectionStartCallback = null;
+    }
+
     /**
      * Spawns and connects to a child process. May be called on any thread. It will not block, but
      * will instead callback to {@link #nativeOnChildProcessStarted} when the connection is
@@ -372,48 +378,46 @@
             ChildProcessConnection allocatedConnection = null;
             String packageName = creationParams != null ? creationParams.getPackageName()
                     : context.getPackageName();
-            synchronized (sSpareConnectionLock) {
-                if (inSandbox && sSpareSandboxedConnection != null
-                        && SPARE_CONNECTION_ALWAYS_IN_FOREGROUND == alwaysInForeground
-                        && sSpareSandboxedConnection.getPackageName().equals(packageName)
-                        // Object identity check for getDefault should be enough. The default is
-                        // not supposed to change once set.
-                        && creationParams == ChildProcessCreationParams.getDefault()) {
-                    while (sSpareConnectionStarting) {
-                        try {
-                            sSpareConnectionLock.wait();
-                        } catch (InterruptedException ex) {
+            ChildProcessConnection.StartCallback startCallback =
+                    new ChildProcessConnection.StartCallback() {
+                        @Override
+                        public void onChildStarted() {}
+
+                        @Override
+                        public void onChildStartFailed() {
+                            assert LauncherThread.runningOnLauncherThread();
+                            Log.e(TAG, "ChildProcessConnection.start failed, trying again");
+                            LauncherThread.post(new Runnable() {
+                                @Override
+                                public void run() {
+                                    // The child process may already be bound to another client
+                                    // (this can happen if multi-process WebView is used in more
+                                    // than one process), so try starting the process again.
+                                    // This connection that failed to start has not been freed,
+                                    // so a new bound connection will be allocated.
+                                    startInternal(context, commandLine, childProcessId,
+                                            filesToBeMapped, launchCallback, childProcessCallback,
+                                            inSandbox, alwaysInForeground, creationParams);
+                                }
+                            });
                         }
-                    }
-                    allocatedConnection = sSpareSandboxedConnection;
-                    sSpareSandboxedConnection = null;
+                    };
+
+            if (inSandbox && sSpareSandboxedConnection != null
+                    && sSpareConnectionStartCallback == null
+                    && SPARE_CONNECTION_ALWAYS_IN_FOREGROUND == alwaysInForeground
+                    && sSpareSandboxedConnection.getPackageName().equals(packageName)
+                    // Object identity check for getDefault should be enough. The default is
+                    // not supposed to change once set.
+                    && creationParams == ChildProcessCreationParams.getDefault()) {
+                allocatedConnection = sSpareSandboxedConnection;
+                if (sSpareConnectionStarting) {
+                    sSpareConnectionStartCallback = startCallback;
+                } else {
+                    clearSpareConnection();
                 }
             }
             if (allocatedConnection == null) {
-                ChildProcessConnection.StartCallback startCallback =
-                        new ChildProcessConnection.StartCallback() {
-                            @Override
-                            public void onChildStarted() {}
-
-                            @Override
-                            public void onChildStartFailed() {
-                                Log.e(TAG, "ChildProcessConnection.start failed, trying again");
-                                LauncherThread.post(new Runnable() {
-                                    @Override
-                                    public void run() {
-                                        // The child process may already be bound to another client
-                                        // (this can happen if multi-process WebView is used in more
-                                        // than one process), so try starting the process again.
-                                        // This connection that failed to start has not been freed,
-                                        // so a new bound connection will be allocated.
-                                        startInternal(context, commandLine, childProcessId,
-                                                filesToBeMapped, launchCallback,
-                                                childProcessCallback, inSandbox, alwaysInForeground,
-                                                creationParams);
-                                    }
-                                });
-                            }
-                        };
 
                 ChildSpawnData spawnData = new ChildSpawnData(context, commandLine, childProcessId,
                         filesToBeMapped, launchCallback, childProcessCallback, inSandbox,
@@ -425,8 +429,6 @@
                 }
             }
 
-            Log.d(TAG, "Setting up connection to process: slot=%d",
-                    allocatedConnection.getServiceNumber());
             triggerConnectionSetup(allocatedConnection, commandLine, childProcessId,
                     filesToBeMapped, childProcessCallback, launchCallback);
             return allocatedConnection;
@@ -457,6 +459,7 @@
             String[] commandLine, int childProcessId, FileDescriptorInfo[] filesToBeMapped,
             final IBinder childProcessCallback, final LaunchCallback launchCallback) {
         assert LauncherThread.runningOnLauncherThread();
+        Log.d(TAG, "Setting up connection to process: slot=%d", connection.getServiceNumber());
         ChildProcessConnection.ConnectionCallback connectionCallback =
                 new ChildProcessConnection.ConnectionCallback() {
                     @Override
@@ -485,6 +488,7 @@
      * @param pid The pid (process handle) of the service connection obtained from {@link #start}.
      */
     static void stop(int pid) {
+        assert LauncherThread.runningOnLauncherThread();
         Log.d(TAG, "stopping child connection: pid=%d", pid);
         ChildProcessConnection connection = sServiceMap.remove(pid);
         if (connection == null) {
diff --git a/content/public/android/java/src/org/chromium/content/browser/ChildProcessLauncherHelper.java b/content/public/android/java/src/org/chromium/content/browser/ChildProcessLauncherHelper.java
index 71d30e88..9d8845b 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ChildProcessLauncherHelper.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ChildProcessLauncherHelper.java
@@ -88,9 +88,9 @@
         ChildProcessLauncher.getBindingManager().setInForeground(mPid, inForeground);
     }
 
-    // Called on client (UI or IO) thread and launcher thread.
     @CalledByNative
     private static void stop(int pid) {
+        assert LauncherThread.runningOnLauncherThread();
         ChildProcessLauncher.stop(pid);
     }
 
diff --git a/content/public/android/java/src/org/chromium/content/browser/LauncherThread.java b/content/public/android/java/src/org/chromium/content/browser/LauncherThread.java
index 89b4984..622b92b 100644
--- a/content/public/android/java/src/org/chromium/content/browser/LauncherThread.java
+++ b/content/public/android/java/src/org/chromium/content/browser/LauncherThread.java
@@ -26,6 +26,10 @@
         sHandler.post(r);
     }
 
+    public static void postDelayed(Runnable r, long delayMillis) {
+        sHandler.postDelayed(r, delayMillis);
+    }
+
     public static boolean runningOnLauncherThread() {
         return sHandler.getLooper() == Looper.myLooper();
     }
diff --git a/content/public/android/javatests/src/org/chromium/content/browser/ChildProcessLauncherTest.java b/content/public/android/javatests/src/org/chromium/content/browser/ChildProcessLauncherTest.java
index 3ce51ae..ab17b60d 100644
--- a/content/public/android/javatests/src/org/chromium/content/browser/ChildProcessLauncherTest.java
+++ b/content/public/android/javatests/src/org/chromium/content/browser/ChildProcessLauncherTest.java
@@ -562,48 +562,82 @@
      * but doesn't really start the connection to bind a service. It is for testing whether the
      * connection is allocated properly for different application packages.
      */
-    private ChildProcessConnectionImpl allocateConnection(String packageName) {
-        // Allocate a new connection.
-        Context context = getInstrumentation().getTargetContext();
-        ChildProcessCreationParams creationParams =
-                getDefaultChildProcessCreationParams(packageName);
-        return (ChildProcessConnectionImpl) ChildProcessLauncher.allocateConnection(
-                new ChildSpawnData(context, null /* commandLine */, 0 /* childProcessId */,
-                        null /* filesToBeMapped */, null /* launchCallback */,
-                        null /* childProcessCallback */, true /* inSandbox */,
-                        false /* alwaysInForeground */, creationParams),
-                ChildProcessLauncher.createCommonParamsBundle(creationParams),
-                false /* forWarmUp */);
+    private ChildProcessConnectionImpl allocateConnection(final String packageName) {
+        return ChildProcessLauncherTestHelperService.runOnLauncherAndGetResult(
+                new Callable<ChildProcessConnectionImpl>() {
+                    @Override
+                    public ChildProcessConnectionImpl call() {
+                        // Allocate a new connection.
+                        Context context = getInstrumentation().getTargetContext();
+                        ChildProcessCreationParams creationParams =
+                                getDefaultChildProcessCreationParams(packageName);
+                        return (ChildProcessConnectionImpl) ChildProcessLauncher.allocateConnection(
+                                new ChildSpawnData(context, null /* commandLine */,
+                                        0 /* childProcessId */, null /* filesToBeMapped */,
+                                        null /* launchCallback */, null /* childProcessCallback */,
+                                        true /* inSandbox */, false /* alwaysInForeground */,
+                                        creationParams),
+                                ChildProcessLauncher.createCommonParamsBundle(creationParams),
+                                false /* forWarmUp */);
+                    }
+                });
     }
 
-    private static void enqueuePendingSpawnForTesting(Context context, String[] commandLine,
-            ChildProcessCreationParams creationParams, boolean inSandbox) {
-        String packageName =
-                creationParams != null ? creationParams.getPackageName() : context.getPackageName();
-        ChildConnectionAllocator allocator =
-                ChildConnectionAllocator.getAllocator(context, packageName, inSandbox);
-        allocator.enqueuePendingQueueForTesting(new ChildSpawnData(context, commandLine,
-                1 /* childProcessId */, new FileDescriptorInfo[0], null /* launchCallback */,
-                null /* childProcessCallback */, true /* inSandbox */,
-                false /* alwaysInForeground */, creationParams));
+    private static void enqueuePendingSpawnForTesting(final Context context,
+            final String[] commandLine, final ChildProcessCreationParams creationParams,
+            final boolean inSandbox) {
+        ChildProcessLauncherTestHelperService.runOnLauncherThreadBlocking(new Runnable() {
+            @Override
+            public void run() {
+                String packageName = creationParams != null ? creationParams.getPackageName()
+                                                            : context.getPackageName();
+                ChildConnectionAllocator allocator =
+                        ChildConnectionAllocator.getAllocator(context, packageName, inSandbox);
+                allocator.enqueuePendingQueueForTesting(new ChildSpawnData(context, commandLine,
+                        1 /* childProcessId */, new FileDescriptorInfo[0],
+                        null /* launchCallback */, null /* childProcessCallback */,
+                        true /* inSandbox */, false /* alwaysInForeground */, creationParams));
+            }
+        });
     }
 
     private static int allocatedSandboxedConnectionsCountForTesting(
-            Context context, String packageName) {
-        return ChildConnectionAllocator.getAllocator(context, packageName, true /*isSandboxed */)
-                .allocatedConnectionsCountForTesting();
+            final Context context, final String packageName) {
+        return ChildProcessLauncherTestHelperService.runOnLauncherAndGetResult(
+                new Callable<Integer>() {
+                    @Override
+                    public Integer call() {
+                        return ChildConnectionAllocator
+                                .getAllocator(context, packageName, true /*isSandboxed */)
+                                .allocatedConnectionsCountForTesting();
+                    }
+                });
     }
 
     private static ChildProcessConnection[] getSandboxedConnectionArrayForTesting(
-            Context context, String packageName) {
-        return ChildConnectionAllocator.getAllocator(context, packageName, true /*isSandboxed */)
-                .connectionArrayForTesting();
+            final Context context, final String packageName) {
+        return ChildProcessLauncherTestHelperService.runOnLauncherAndGetResult(
+                new Callable<ChildProcessConnection[]>() {
+                    @Override
+                    public ChildProcessConnection[] call() {
+                        return ChildConnectionAllocator
+                                .getAllocator(context, packageName, true /*isSandboxed */)
+                                .connectionArrayForTesting();
+                    }
+                });
     }
 
     private static int pendingSpawnsCountForTesting(
-            Context context, String packageName, boolean inSandbox) {
-        return ChildConnectionAllocator.getAllocator(context, packageName, inSandbox)
-                .pendingSpawnsCountForTesting();
+            final Context context, final String packageName, final boolean inSandbox) {
+        return ChildProcessLauncherTestHelperService.runOnLauncherAndGetResult(
+                new Callable<Integer>() {
+                    @Override
+                    public Integer call() {
+                        return ChildConnectionAllocator
+                                .getAllocator(context, packageName, inSandbox)
+                                .pendingSpawnsCountForTesting();
+                    }
+                });
     }
 
     /**
diff --git a/content/public/renderer/renderer_gamepad_provider.h b/content/public/renderer/renderer_gamepad_provider.h
index b3b4ce3..723ea1d0 100644
--- a/content/public/renderer/renderer_gamepad_provider.h
+++ b/content/public/renderer/renderer_gamepad_provider.h
@@ -10,7 +10,10 @@
 
 namespace blink {
 class WebGamepadListener;
-class WebGamepads;
+}
+
+namespace device {
+class Gamepads;
 }
 
 namespace content {
@@ -25,7 +28,7 @@
   ~RendererGamepadProvider() override {}
 
   // Provides latest snapshot of gamepads.
-  virtual void SampleGamepads(blink::WebGamepads& gamepads) = 0;
+  virtual void SampleGamepads(device::Gamepads& gamepads) = 0;
 
  protected:
   DISALLOW_COPY_AND_ASSIGN(RendererGamepadProvider);
diff --git a/content/renderer/BUILD.gn b/content/renderer/BUILD.gn
index 9d95d274..20c365dd 100644
--- a/content/renderer/BUILD.gn
+++ b/content/renderer/BUILD.gn
@@ -446,6 +446,7 @@
     "//content/public/common:service_names",
     "//crypto:platform",
     "//device/base/synchronization",
+    "//device/gamepad/public/cpp:shared_with_blink",
     "//device/gamepad/public/interfaces",
     "//device/screen_orientation/public/interfaces",
     "//device/sensors/public/cpp:full",
diff --git a/content/renderer/DEPS b/content/renderer/DEPS
index b74ae72..de7b52d2 100644
--- a/content/renderer/DEPS
+++ b/content/renderer/DEPS
@@ -12,6 +12,7 @@
   "+content/public/renderer",
   "+content/child",
   "+device/base/synchronization",
+  "+device/gamepad/public/cpp",
   "+device/gamepad/public/interfaces",
   "+device/screen_orientation/public/interfaces",
   "+device/sensors/public",
diff --git a/content/renderer/gamepad_shared_memory_reader.cc b/content/renderer/gamepad_shared_memory_reader.cc
index 1e34ea13..cfa756f 100644
--- a/content/renderer/gamepad_shared_memory_reader.cc
+++ b/content/renderer/gamepad_shared_memory_reader.cc
@@ -60,7 +60,7 @@
       static_cast<GamepadHardwareBuffer*>(memory);
 }
 
-void GamepadSharedMemoryReader::SampleGamepads(blink::WebGamepads& gamepads) {
+void GamepadSharedMemoryReader::SampleGamepads(device::Gamepads& gamepads) {
   // Blink should have started observing at that point.
   CHECK(is_observing());
 
@@ -70,7 +70,7 @@
   //
   // This logic is duplicated in Pepper as well. If you change it, that also
   // needs to be in sync. See ppapi/proxy/gamepad_resource.cc.
-  blink::WebGamepads read_into;
+  device::Gamepads read_into;
   TRACE_EVENT0("GAMEPAD", "SampleGamepads");
 
   if (!renderer_shared_buffer_handle_.is_valid())
@@ -107,7 +107,7 @@
     // gamepads to prevent fingerprinting. The actual data is not cleared.
     // WebKit will only copy out data into the JS buffers for connected
     // gamepads so this is sufficient.
-    for (unsigned i = 0; i < blink::WebGamepads::kItemsLengthCap; i++)
+    for (unsigned i = 0; i < device::Gamepads::kItemsLengthCap; i++)
       gamepads.items[i].connected = false;
   }
 }
@@ -118,7 +118,7 @@
 
 void GamepadSharedMemoryReader::GamepadConnected(
     int index,
-    const blink::WebGamepad& gamepad) {
+    const device::Gamepad& gamepad) {
   // The browser already checks if the user actually interacted with a device.
   ever_interacted_with_ = true;
 
@@ -128,7 +128,7 @@
 
 void GamepadSharedMemoryReader::GamepadDisconnected(
     int index,
-    const blink::WebGamepad& gamepad) {
+    const device::Gamepad& gamepad) {
   if (listener())
     listener()->DidDisconnectGamepad(index, gamepad);
 }
diff --git a/content/renderer/gamepad_shared_memory_reader.h b/content/renderer/gamepad_shared_memory_reader.h
index 05369cb..789a785 100644
--- a/content/renderer/gamepad_shared_memory_reader.h
+++ b/content/renderer/gamepad_shared_memory_reader.h
@@ -10,14 +10,14 @@
 #include "base/macros.h"
 #include "content/public/renderer/renderer_gamepad_provider.h"
 #include "device/base/synchronization/shared_memory_seqlock_buffer.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 #include "device/gamepad/public/interfaces/gamepad.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "mojo/public/cpp/system/buffer.h"
-#include "third_party/WebKit/public/platform/WebGamepads.h"
 
 namespace content {
 
-typedef device::SharedMemorySeqLockBuffer<blink::WebGamepads>
+typedef device::SharedMemorySeqLockBuffer<device::Gamepads>
     GamepadHardwareBuffer;
 
 class GamepadSharedMemoryReader : public RendererGamepadProvider,
@@ -27,7 +27,7 @@
   ~GamepadSharedMemoryReader() override;
 
   // RendererGamepadProvider implementation.
-  void SampleGamepads(blink::WebGamepads& gamepads) override;
+  void SampleGamepads(device::Gamepads& gamepads) override;
   void Start(blink::WebPlatformEventListener* listener) override;
 
  protected:
@@ -37,9 +37,8 @@
 
  private:
   // device::mojom::GamepadObserver methods.
-  void GamepadConnected(int index, const blink::WebGamepad& gamepad) override;
-  void GamepadDisconnected(int index,
-                           const blink::WebGamepad& gamepad) override;
+  void GamepadConnected(int index, const device::Gamepad& gamepad) override;
+  void GamepadDisconnected(int index, const device::Gamepad& gamepad) override;
 
   mojo::ScopedSharedBufferHandle renderer_shared_buffer_handle_;
   mojo::ScopedSharedBufferMapping renderer_shared_buffer_mapping_;
diff --git a/content/renderer/pepper/event_conversion.cc b/content/renderer/pepper/event_conversion.cc
index dbf6e2c9..452b6ca 100644
--- a/content/renderer/pepper/event_conversion.cc
+++ b/content/renderer/pepper/event_conversion.cc
@@ -19,9 +19,9 @@
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "content/common/input/web_touch_event_traits.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 #include "ppapi/c/pp_input_event.h"
 #include "ppapi/shared_impl/ppb_input_event_shared.h"
-#include "third_party/WebKit/public/platform/WebGamepads.h"
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
 #include "third_party/WebKit/public/platform/WebKeyboardEvent.h"
 #include "third_party/WebKit/public/platform/WebMouseWheelEvent.h"
diff --git a/content/renderer/pepper/pepper_plugin_instance_impl.cc b/content/renderer/pepper/pepper_plugin_instance_impl.cc
index 433427f..592133d 100644
--- a/content/renderer/pepper/pepper_plugin_instance_impl.cc
+++ b/content/renderer/pepper/pepper_plugin_instance_impl.cc
@@ -61,6 +61,7 @@
 #include "content/renderer/render_widget.h"
 #include "content/renderer/render_widget_fullscreen_pepper.h"
 #include "content/renderer/sad_plugin.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 #include "ppapi/c/dev/ppp_text_input_dev.h"
 #include "ppapi/c/pp_rect.h"
 #include "ppapi/c/ppb_audio_config.h"
@@ -98,7 +99,6 @@
 #include "third_party/WebKit/public/platform/URLConversion.h"
 #include "third_party/WebKit/public/platform/WebCursorInfo.h"
 #include "third_party/WebKit/public/platform/WebFloatRect.h"
-#include "third_party/WebKit/public/platform/WebGamepads.h"
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
 #include "third_party/WebKit/public/platform/WebKeyboardEvent.h"
 #include "third_party/WebKit/public/platform/WebMouseEvent.h"
@@ -458,9 +458,9 @@
 void PepperPluginInstanceImpl::GamepadImpl::Sample(
     PP_Instance instance,
     PP_GamepadsSampleData* data) {
-  blink::WebGamepads webkit_data;
-  RenderThreadImpl::current()->SampleGamepads(&webkit_data);
-  ConvertWebKitGamepadData(bit_cast<ppapi::WebKitGamepads>(webkit_data), data);
+  device::Gamepads gamepads_data;
+  RenderThreadImpl::current()->SampleGamepads(&gamepads_data);
+  ppapi::ConvertDeviceGamepadData(gamepads_data, data);
 }
 
 PepperPluginInstanceImpl::PepperPluginInstanceImpl(
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 323ee7d..cc67973 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -122,6 +122,7 @@
 #include "content/renderer/service_worker/service_worker_context_client.h"
 #include "content/renderer/service_worker/service_worker_context_message_filter.h"
 #include "content/renderer/shared_worker/embedded_shared_worker_stub.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 #include "gin/public/debug.h"
 #include "gpu/GLES2/gl2extchromium.h"
 #include "gpu/command_buffer/client/shared_memory_limits.h"
@@ -2326,7 +2327,7 @@
   return shared_worker_context_provider_;
 }
 
-void RenderThreadImpl::SampleGamepads(blink::WebGamepads* data) {
+void RenderThreadImpl::SampleGamepads(device::Gamepads* data) {
   blink_platform_impl_->SampleGamepads(*data);
 }
 
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 35c36aa..4ee6d4f7f 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -62,7 +62,6 @@
 namespace scheduler {
 class WebThreadBase;
 }
-class WebGamepads;
 class WebMediaStreamCenter;
 class WebMediaStreamCenterClient;
 }
@@ -79,6 +78,10 @@
 class TaskGraphRunner;
 }
 
+namespace device {
+class Gamepads;
+}
+
 namespace discardable_memory {
 class ClientDiscardableSharedMemoryManager;
 }
@@ -461,7 +464,7 @@
   }
 
   // Retrieve current gamepad data.
-  void SampleGamepads(blink::WebGamepads* data);
+  void SampleGamepads(device::Gamepads* data);
 
   // Called by a RenderWidget when it is created or destroyed. This
   // allows the process to know when there are no visible widgets.
diff --git a/content/renderer/renderer_blink_platform_impl.cc b/content/renderer/renderer_blink_platform_impl.cc
index 1a8a8f6a..91c24cf 100644
--- a/content/renderer/renderer_blink_platform_impl.cc
+++ b/content/renderer/renderer_blink_platform_impl.cc
@@ -69,6 +69,7 @@
 #include "content/renderer/webclipboard_impl.h"
 #include "content/renderer/webgraphicscontext3d_provider_impl.h"
 #include "content/renderer/webpublicsuffixlist_impl.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "gpu/config/gpu_info.h"
 #include "gpu/ipc/client/gpu_channel_host.h"
@@ -90,7 +91,6 @@
 #include "third_party/WebKit/public/platform/WebBlobRegistry.h"
 #include "third_party/WebKit/public/platform/WebDeviceLightListener.h"
 #include "third_party/WebKit/public/platform/WebFileInfo.h"
-#include "third_party/WebKit/public/platform/WebGamepads.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamCenter.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamCenterClient.h"
 #include "third_party/WebKit/public/platform/WebPluginListBuilder.h"
@@ -148,8 +148,6 @@
 using blink::WebDatabaseObserver;
 using blink::WebFileInfo;
 using blink::WebFileSystem;
-using blink::WebGamepad;
-using blink::WebGamepads;
 using blink::WebIDBFactory;
 using blink::WebImageCaptureFrameGrabber;
 using blink::WebMIDIAccessor;
@@ -785,7 +783,7 @@
 
 //------------------------------------------------------------------------------
 
-void RendererBlinkPlatformImpl::SampleGamepads(WebGamepads& gamepads) {
+void RendererBlinkPlatformImpl::SampleGamepads(device::Gamepads& gamepads) {
   PlatformEventObserverBase* observer =
       platform_event_observers_.Lookup(blink::kWebPlatformEventTypeGamepad);
   if (!observer)
diff --git a/content/renderer/renderer_blink_platform_impl.h b/content/renderer/renderer_blink_platform_impl.h
index 19306dfd..0b3fa167 100644
--- a/content/renderer/renderer_blink_platform_impl.h
+++ b/content/renderer/renderer_blink_platform_impl.h
@@ -43,6 +43,7 @@
 }
 
 namespace device {
+class Gamepads;
 class MotionData;
 class OrientationData;
 }
@@ -156,7 +157,7 @@
       blink::WebMIDIAccessorClient* client) override;
 
   blink::WebBlobRegistry* GetBlobRegistry() override;
-  void SampleGamepads(blink::WebGamepads&) override;
+  void SampleGamepads(device::Gamepads&) override;
   blink::WebRTCPeerConnectionHandler* CreateRTCPeerConnectionHandler(
       blink::WebRTCPeerConnectionHandlerClient* client) override;
   blink::WebRTCCertificateGenerator* CreateRTCCertificateGenerator() override;
diff --git a/content/shell/renderer/layout_test/blink_test_runner.cc b/content/shell/renderer/layout_test/blink_test_runner.cc
index 24b8b70..442b2b8 100644
--- a/content/shell/renderer/layout_test/blink_test_runner.cc
+++ b/content/shell/renderer/layout_test/blink_test_runner.cc
@@ -161,7 +161,7 @@
   }
 
   // RendererGamepadProvider implementation.
-  void SampleGamepads(blink::WebGamepads& gamepads) override {
+  void SampleGamepads(device::Gamepads& gamepads) override {
     controller_->SampleGamepads(gamepads);
   }
   void Start(blink::WebPlatformEventListener* listener) override {
diff --git a/content/shell/test_runner/BUILD.gn b/content/shell/test_runner/BUILD.gn
index 9cf5bcc..ac15a4027 100644
--- a/content/shell/test_runner/BUILD.gn
+++ b/content/shell/test_runner/BUILD.gn
@@ -115,6 +115,7 @@
     "//cc/paint",
     "//content/public/common",
     "//content/test:test_runner_support",
+    "//device/gamepad/public/cpp:shared_with_blink",
     "//device/sensors/public/cpp:full",
     "//gin",
     "//gpu",
diff --git a/content/shell/test_runner/DEPS b/content/shell/test_runner/DEPS
index f76fc0d7c..4e2248a9 100644
--- a/content/shell/test_runner/DEPS
+++ b/content/shell/test_runner/DEPS
@@ -1,6 +1,7 @@
 include_rules = [
   "+cc",
   "+content/public/test",
+  "+device/gamepad/public/cpp",
   "+device/sensors/public/cpp",
   "+gin",
   "+gpu/command_buffer/client",
diff --git a/content/shell/test_runner/gamepad_controller.cc b/content/shell/test_runner/gamepad_controller.cc
index fdf8ea3..f58bfa4 100644
--- a/content/shell/test_runner/gamepad_controller.cc
+++ b/content/shell/test_runner/gamepad_controller.cc
@@ -18,8 +18,8 @@
 #include "v8/include/v8.h"
 
 using blink::WebFrame;
-using blink::WebGamepad;
-using blink::WebGamepads;
+using device::Gamepad;
+using device::Gamepads;
 
 namespace test_runner {
 
@@ -165,8 +165,8 @@
   GamepadControllerBindings::Install(weak_factory_.GetWeakPtr(), frame);
 }
 
-void GamepadController::SampleGamepads(blink::WebGamepads& gamepads) {
-  memcpy(&gamepads, &gamepads_, sizeof(blink::WebGamepads));
+void GamepadController::SampleGamepads(Gamepads& gamepads) {
+  memcpy(&gamepads, &gamepads_, sizeof(Gamepads));
 }
 
 void GamepadController::SetListener(blink::WebGamepadListener* listener) {
@@ -174,67 +174,67 @@
 }
 
 void GamepadController::Connect(int index) {
-  if (index < 0 || index >= static_cast<int>(WebGamepads::kItemsLengthCap))
+  if (index < 0 || index >= static_cast<int>(Gamepads::kItemsLengthCap))
     return;
   gamepads_.items[index].connected = true;
 }
 
 void GamepadController::DispatchConnected(int index) {
-  if (index < 0 || index >= static_cast<int>(WebGamepads::kItemsLengthCap) ||
+  if (index < 0 || index >= static_cast<int>(Gamepads::kItemsLengthCap) ||
       !gamepads_.items[index].connected)
     return;
-  const WebGamepad& pad = gamepads_.items[index];
+  const Gamepad& pad = gamepads_.items[index];
   if (listener_)
     listener_->DidConnectGamepad(index, pad);
 }
 
 void GamepadController::Disconnect(int index) {
-  if (index < 0 || index >= static_cast<int>(WebGamepads::kItemsLengthCap))
+  if (index < 0 || index >= static_cast<int>(Gamepads::kItemsLengthCap))
     return;
-  WebGamepad& pad = gamepads_.items[index];
+  Gamepad& pad = gamepads_.items[index];
   pad.connected = false;
   if (listener_)
     listener_->DidDisconnectGamepad(index, pad);
 }
 
 void GamepadController::SetId(int index, const std::string& src) {
-  if (index < 0 || index >= static_cast<int>(WebGamepads::kItemsLengthCap))
+  if (index < 0 || index >= static_cast<int>(Gamepads::kItemsLengthCap))
     return;
   const char* p = src.c_str();
   memset(gamepads_.items[index].id, 0, sizeof(gamepads_.items[index].id));
-  for (unsigned i = 0; *p && i < WebGamepad::kIdLengthCap - 1; ++i)
+  for (unsigned i = 0; *p && i < Gamepad::kIdLengthCap - 1; ++i)
     gamepads_.items[index].id[i] = *p++;
 }
 
 void GamepadController::SetButtonCount(int index, int buttons) {
-  if (index < 0 || index >= static_cast<int>(WebGamepads::kItemsLengthCap))
+  if (index < 0 || index >= static_cast<int>(Gamepads::kItemsLengthCap))
     return;
-  if (buttons < 0 || buttons >= static_cast<int>(WebGamepad::kButtonsLengthCap))
+  if (buttons < 0 || buttons >= static_cast<int>(Gamepad::kButtonsLengthCap))
     return;
   gamepads_.items[index].buttons_length = buttons;
 }
 
 void GamepadController::SetButtonData(int index, int button, double data) {
-  if (index < 0 || index >= static_cast<int>(WebGamepads::kItemsLengthCap))
+  if (index < 0 || index >= static_cast<int>(Gamepads::kItemsLengthCap))
     return;
-  if (button < 0 || button >= static_cast<int>(WebGamepad::kButtonsLengthCap))
+  if (button < 0 || button >= static_cast<int>(Gamepad::kButtonsLengthCap))
     return;
   gamepads_.items[index].buttons[button].value = data;
   gamepads_.items[index].buttons[button].pressed = data > 0.1f;
 }
 
 void GamepadController::SetAxisCount(int index, int axes) {
-  if (index < 0 || index >= static_cast<int>(WebGamepads::kItemsLengthCap))
+  if (index < 0 || index >= static_cast<int>(Gamepads::kItemsLengthCap))
     return;
-  if (axes < 0 || axes >= static_cast<int>(WebGamepad::kAxesLengthCap))
+  if (axes < 0 || axes >= static_cast<int>(Gamepad::kAxesLengthCap))
     return;
   gamepads_.items[index].axes_length = axes;
 }
 
 void GamepadController::SetAxisData(int index, int axis, double data) {
-  if (index < 0 || index >= static_cast<int>(WebGamepads::kItemsLengthCap))
+  if (index < 0 || index >= static_cast<int>(Gamepads::kItemsLengthCap))
     return;
-  if (axis < 0 || axis >= static_cast<int>(WebGamepad::kAxesLengthCap))
+  if (axis < 0 || axis >= static_cast<int>(Gamepad::kAxesLengthCap))
     return;
   gamepads_.items[index].axes[axis] = data;
 }
diff --git a/content/shell/test_runner/gamepad_controller.h b/content/shell/test_runner/gamepad_controller.h
index 36aa1f16..787eec5 100644
--- a/content/shell/test_runner/gamepad_controller.h
+++ b/content/shell/test_runner/gamepad_controller.h
@@ -10,7 +10,7 @@
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "content/shell/test_runner/test_runner_export.h"
-#include "third_party/WebKit/public/platform/WebGamepads.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 
 namespace blink {
 class WebFrame;
@@ -30,7 +30,7 @@
   void Reset();
   void Install(blink::WebFrame* frame);
 
-  void SampleGamepads(blink::WebGamepads& gamepads);
+  void SampleGamepads(device::Gamepads& gamepads);
   void SetListener(blink::WebGamepadListener* listener);
 
  private:
@@ -55,7 +55,7 @@
 
   blink::WebGamepadListener* listener_;
 
-  blink::WebGamepads gamepads_;
+  device::Gamepads gamepads_;
 
   // Mapping from gamepad index to connection state.
   std::map<int, bool> pending_changes_;
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index 4410322..1192e99 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -491,6 +491,7 @@
     "//content/renderer:for_content_tests",
     "//content/shell/test_runner:test_runner",
     "//device/bluetooth",
+    "//device/gamepad/public/cpp:shared_with_blink",
     "//device/sensors/public/cpp:full",
     "//services/ui/public/cpp/gpu",
     "//skia",
@@ -1471,6 +1472,7 @@
     "//device/bluetooth:mocks",
     "//device/gamepad",
     "//device/gamepad:test_helpers",
+    "//device/gamepad/public/cpp:shared_with_blink",
     "//device/sensors/public/cpp:full",
     "//device/sensors/public/interfaces",
     "//gin",
diff --git a/content/test/DEPS b/content/test/DEPS
index 8ac3763..ef6200b 100644
--- a/content/test/DEPS
+++ b/content/test/DEPS
@@ -10,6 +10,7 @@
   # Testing utilities can access anything in content/
   "+content",
   "+device/bluetooth", # For WebBluetooth tests
+  "+device/gamepad/public/cpp",
   "+device/sensors/public/cpp",
   # For loading V8's initial snapshot from external files.
   "+gin/v8_initializer.h",
diff --git a/content/test/layouttest_support.cc b/content/test/layouttest_support.cc
index daa6d5cd..8d6a109 100644
--- a/content/test/layouttest_support.cc
+++ b/content/test/layouttest_support.cc
@@ -45,7 +45,6 @@
 #include "gpu/ipc/service/image_transport_surface.h"
 #include "services/ui/public/cpp/gpu/context_provider_command_buffer.h"
 #include "third_party/WebKit/public/platform/WebFloatRect.h"
-#include "third_party/WebKit/public/platform/WebGamepads.h"
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
 #include "third_party/WebKit/public/platform/WebRect.h"
 #include "third_party/WebKit/public/platform/scheduler/test/renderer_scheduler_test_support.h"
@@ -69,8 +68,6 @@
 
 using device::MotionData;
 using device::OrientationData;
-using blink::WebGamepad;
-using blink::WebGamepads;
 using blink::WebRect;
 using blink::WebSize;
 
diff --git a/device/BUILD.gn b/device/BUILD.gn
index eba54e2..1542a87 100644
--- a/device/BUILD.gn
+++ b/device/BUILD.gn
@@ -90,6 +90,7 @@
     "//device/bluetooth/uribeacon",
     "//device/gamepad",
     "//device/gamepad:test_helpers",
+    "//device/gamepad/public/cpp:shared_with_blink",
     "//device/gamepad/public/interfaces",
     "//device/gamepad/public/interfaces:gamepad_struct_traits_test",
     "//device/generic_sensor",
diff --git a/device/gamepad/BUILD.gn b/device/gamepad/BUILD.gn
index f9634734..2cbc2e5c 100644
--- a/device/gamepad/BUILD.gn
+++ b/device/gamepad/BUILD.gn
@@ -60,6 +60,7 @@
     "//base",
     "//base/third_party/dynamic_annotations",
     "//device/base/synchronization",
+    "//device/gamepad/public/cpp:shared_with_blink",
     "//device/gamepad/public/interfaces",
     "//mojo/public/cpp/system",
     "//third_party/WebKit/public:blink_headers",
@@ -104,6 +105,7 @@
   public_deps = [
     ":gamepad",
     "//base",
+    "//device/gamepad/public/cpp:shared_with_blink",
     "//third_party/WebKit/public:blink_headers",
   ]
 }
diff --git a/device/gamepad/DEPS b/device/gamepad/DEPS
index 299c60a..c80012b5 100644
--- a/device/gamepad/DEPS
+++ b/device/gamepad/DEPS
@@ -1,5 +1,3 @@
 include_rules = [
   "+jni",
-  "+third_party/WebKit/public/platform/WebGamepad.h",
-  "+third_party/WebKit/public/platform/WebGamepads.h",
 ]
diff --git a/device/gamepad/game_controller_data_fetcher_mac.mm b/device/gamepad/game_controller_data_fetcher_mac.mm
index 797831c..9be2d8f 100644
--- a/device/gamepad/game_controller_data_fetcher_mac.mm
+++ b/device/gamepad/game_controller_data_fetcher_mac.mm
@@ -14,19 +14,16 @@
 
 #import <GameController/GameController.h>
 
-using blink::WebGamepad;
-using blink::WebGamepads;
-
 namespace device {
 
 namespace {
 
 void CopyNSStringAsUTF16LittleEndian(NSString* src,
-                                     blink::WebUChar* dest,
+                                     UChar* dest,
                                      size_t dest_len) {
   NSData* as16 = [src dataUsingEncoding:NSUTF16LittleEndianStringEncoding];
   memset(dest, 0, dest_len);
-  [as16 getBytes:dest length:dest_len - sizeof(blink::WebUChar)];
+  [as16 getBytes:dest length:dest_len - sizeof(UChar)];
 }
 
 }  // namespace
@@ -55,7 +52,7 @@
     if (!state)
       continue;
 
-    WebGamepad& pad = state->data;
+    Gamepad& pad = state->data;
 
     // This first time we encounter a gamepad, set its name, mapping, and
     // axes/button counts. This information is static, so it only needs to be
diff --git a/device/gamepad/gamepad_consumer.h b/device/gamepad/gamepad_consumer.h
index 7c9201a..f80183d 100644
--- a/device/gamepad/gamepad_consumer.h
+++ b/device/gamepad/gamepad_consumer.h
@@ -6,7 +6,7 @@
 #define DEVICE_GAMEPAD_GAMEPAD_CONSUMER_H_
 
 #include "device/gamepad/gamepad_export.h"
-#include "third_party/WebKit/public/platform/WebGamepad.h"
+#include "device/gamepad/public/cpp/gamepad.h"
 
 namespace device {
 
@@ -15,10 +15,9 @@
   GamepadConsumer();
   virtual ~GamepadConsumer();
 
-  virtual void OnGamepadConnected(unsigned index,
-                                  const blink::WebGamepad& gamepad) = 0;
+  virtual void OnGamepadConnected(unsigned index, const Gamepad& gamepad) = 0;
   virtual void OnGamepadDisconnected(unsigned index,
-                                     const blink::WebGamepad& gamepad) = 0;
+                                     const Gamepad& gamepad) = 0;
 };
 
 }  // namespace device
diff --git a/device/gamepad/gamepad_monitor.cc b/device/gamepad/gamepad_monitor.cc
index 93990d3..c385d18 100644
--- a/device/gamepad/gamepad_monitor.cc
+++ b/device/gamepad/gamepad_monitor.cc
@@ -26,13 +26,13 @@
 }
 
 void GamepadMonitor::OnGamepadConnected(unsigned index,
-                                        const blink::WebGamepad& gamepad) {
+                                        const Gamepad& gamepad) {
   if (gamepad_observer_)
     gamepad_observer_->GamepadConnected(index, gamepad);
 }
 
 void GamepadMonitor::OnGamepadDisconnected(unsigned index,
-                                           const blink::WebGamepad& gamepad) {
+                                           const Gamepad& gamepad) {
   if (gamepad_observer_)
     gamepad_observer_->GamepadDisconnected(index, gamepad);
 }
diff --git a/device/gamepad/gamepad_monitor.h b/device/gamepad/gamepad_monitor.h
index fab371e..5572189e 100644
--- a/device/gamepad/gamepad_monitor.h
+++ b/device/gamepad/gamepad_monitor.h
@@ -23,10 +23,8 @@
   static void Create(mojom::GamepadMonitorRequest request);
 
   // GamepadConsumer implementation.
-  void OnGamepadConnected(unsigned index,
-                          const blink::WebGamepad& gamepad) override;
-  void OnGamepadDisconnected(unsigned index,
-                             const blink::WebGamepad& gamepad) override;
+  void OnGamepadConnected(unsigned index, const Gamepad& gamepad) override;
+  void OnGamepadDisconnected(unsigned index, const Gamepad& gamepad) override;
 
   // mojom::GamepadMonitor implementation.
   void GamepadStartPolling(
diff --git a/device/gamepad/gamepad_pad_state_provider.cc b/device/gamepad/gamepad_pad_state_provider.cc
index afc8beb..8f525cb 100644
--- a/device/gamepad/gamepad_pad_state_provider.cc
+++ b/device/gamepad/gamepad_pad_state_provider.cc
@@ -7,10 +7,7 @@
 #include <cmath>
 
 #include "device/gamepad/gamepad_data_fetcher.h"
-#include "third_party/WebKit/public/platform/WebGamepads.h"
-
-using blink::WebGamepad;
-using blink::WebGamepads;
+#include "device/gamepad/public/cpp/gamepads.h"
 
 namespace device {
 
@@ -21,9 +18,9 @@
 }  // namespace
 
 GamepadPadStateProvider::GamepadPadStateProvider() {
-  pad_states_.reset(new PadState[WebGamepads::kItemsLengthCap]);
+  pad_states_.reset(new PadState[Gamepads::kItemsLengthCap]);
 
-  for (unsigned i = 0; i < WebGamepads::kItemsLengthCap; ++i)
+  for (unsigned i = 0; i < Gamepads::kItemsLengthCap; ++i)
     ClearPadState(pad_states_.get()[i]);
 }
 
@@ -33,7 +30,7 @@
                                                int source_id) {
   // Check to see if the device already has a reserved slot
   PadState* empty_slot = nullptr;
-  for (size_t i = 0; i < WebGamepads::kItemsLengthCap; ++i) {
+  for (size_t i = 0; i < Gamepads::kItemsLengthCap; ++i) {
     PadState& state = pad_states_.get()[i];
     if (state.source == source && state.source_id == source_id) {
       // Retrieving the pad state marks this gamepad as active.
@@ -61,13 +58,13 @@
 }
 
 void GamepadPadStateProvider::MapAndSanitizeGamepadData(PadState* pad_state,
-                                                        WebGamepad* pad,
+                                                        Gamepad* pad,
                                                         bool sanitize) {
   DCHECK(pad_state);
   DCHECK(pad);
 
   if (!pad_state->data.connected) {
-    memset(pad, 0, sizeof(WebGamepad));
+    memset(pad, 0, sizeof(Gamepad));
     return;
   }
 
diff --git a/device/gamepad/gamepad_pad_state_provider.h b/device/gamepad/gamepad_pad_state_provider.h
index 3ba8342..c4624ba 100644
--- a/device/gamepad/gamepad_pad_state_provider.h
+++ b/device/gamepad/gamepad_pad_state_provider.h
@@ -12,7 +12,7 @@
 
 #include "device/gamepad/gamepad_export.h"
 #include "device/gamepad/gamepad_standard_mappings.h"
-#include "third_party/WebKit/public/platform/WebGamepad.h"
+#include "device/gamepad/public/cpp/gamepad.h"
 
 namespace device {
 
@@ -47,7 +47,7 @@
   GamepadActiveState active_state;
 
   // Gamepad data, unmapped.
-  blink::WebGamepad data;
+  Gamepad data;
 
   // Functions to map from device data to standard layout, if available. May
   // be null if no mapping is available or needed.
@@ -59,13 +59,13 @@
   // corresponding bit will be set to 1.
 
   // If we ever increase the max axis count this will need to be updated.
-  static_assert(blink::WebGamepad::kAxesLengthCap <=
+  static_assert(Gamepad::kAxesLengthCap <=
                     std::numeric_limits<uint32_t>::digits,
                 "axis_mask is not large enough");
   uint32_t axis_mask;
 
   // If we ever increase the max button count this will need to be updated.
-  static_assert(blink::WebGamepad::kButtonsLengthCap <=
+  static_assert(Gamepad::kButtonsLengthCap <=
                     std::numeric_limits<uint32_t>::digits,
                 "button_mask is not large enough");
   uint32_t button_mask;
@@ -87,7 +87,7 @@
   void InitializeDataFetcher(GamepadDataFetcher* fetcher);
 
   void MapAndSanitizeGamepadData(PadState* pad_state,
-                                 blink::WebGamepad* pad,
+                                 Gamepad* pad,
                                  bool sanitize);
 
   // Tracks the state of each gamepad slot.
diff --git a/device/gamepad/gamepad_platform_data_fetcher_android.cc b/device/gamepad/gamepad_platform_data_fetcher_android.cc
index d57649ccd..f925b07 100644
--- a/device/gamepad/gamepad_platform_data_fetcher_android.cc
+++ b/device/gamepad/gamepad_platform_data_fetcher_android.cc
@@ -16,16 +16,12 @@
 
 #include "jni/GamepadList_jni.h"
 
-#include "third_party/WebKit/public/platform/WebGamepads.h"
-
 using base::android::AttachCurrentThread;
 using base::android::CheckException;
 using base::android::ClearException;
 using base::android::ConvertJavaStringToUTF8;
 using base::android::JavaParamRef;
 using base::android::ScopedJavaLocalRef;
-using blink::WebGamepad;
-using blink::WebGamepads;
 
 namespace device {
 
@@ -81,7 +77,7 @@
   DCHECK(data_fetcher);
   GamepadPlatformDataFetcherAndroid* fetcher =
       reinterpret_cast<GamepadPlatformDataFetcherAndroid*>(data_fetcher);
-  DCHECK_LT(index, static_cast<int>(blink::WebGamepads::kItemsLengthCap));
+  DCHECK_LT(index, static_cast<int>(Gamepads::kItemsLengthCap));
 
   // Do not set gamepad parameters for all the gamepad devices that are not
   // attached.
@@ -93,25 +89,25 @@
   if (!state)
     return;
 
-  blink::WebGamepad& pad = state->data;
+  Gamepad& pad = state->data;
 
   // Is this the first time we've seen this device?
   if (state->active_state == GAMEPAD_NEWLY_ACTIVE) {
-    // Map the Gamepad DeviceName String to the WebGamepad Id. Ideally it should
+    // Map the Gamepad DeviceName String to the Gamepad Id. Ideally it should
     // be mapped to vendor and product information but it is only available at
     // kernel level and it can not be queried using class
     // android.hardware.input.InputManager.
     base::string16 device_name;
     base::android::ConvertJavaStringToUTF16(env, devicename, &device_name);
     const size_t name_to_copy =
-        std::min(device_name.size(), WebGamepad::kIdLengthCap - 1);
+        std::min(device_name.size(), Gamepad::kIdLengthCap - 1);
     memcpy(pad.id, device_name.data(),
            name_to_copy * sizeof(base::string16::value_type));
     pad.id[name_to_copy] = 0;
 
     base::string16 mapping_name = base::UTF8ToUTF16(mapping ? "standard" : "");
     const size_t mapping_to_copy =
-        std::min(mapping_name.size(), WebGamepad::kMappingLengthCap - 1);
+        std::min(mapping_name.size(), Gamepad::kMappingLengthCap - 1);
     memcpy(pad.mapping, mapping_name.data(),
            mapping_to_copy * sizeof(base::string16::value_type));
     pad.mapping[mapping_to_copy] = 0;
@@ -123,13 +119,13 @@
   std::vector<float> axes;
   base::android::JavaFloatArrayToFloatVector(env, jaxes, &axes);
 
-  // Set WebGamepad axeslength to total number of axes on the gamepad device.
+  // Set Gamepad axeslength to total number of axes on the gamepad device.
   // Only return the first axesLengthCap if axeslength captured by GamepadList
   // is larger than axesLengthCap.
   pad.axes_length = std::min(static_cast<int>(axes.size()),
-                             static_cast<int>(WebGamepad::kAxesLengthCap));
+                             static_cast<int>(Gamepad::kAxesLengthCap));
 
-  // Copy axes state to the WebGamepad axes[].
+  // Copy axes state to the Gamepad axes[].
   for (unsigned int i = 0; i < pad.axes_length; i++) {
     pad.axes[i] = static_cast<double>(axes[i]);
   }
@@ -137,14 +133,13 @@
   std::vector<float> buttons;
   base::android::JavaFloatArrayToFloatVector(env, jbuttons, &buttons);
 
-  // Set WebGamepad buttonslength to total number of axes on the gamepad
+  // Set Gamepad buttonslength to total number of axes on the gamepad
   // device. Only return the first buttonsLengthCap if axeslength captured by
   // GamepadList is larger than buttonsLengthCap.
-  pad.buttons_length =
-      std::min(static_cast<int>(buttons.size()),
-               static_cast<int>(WebGamepad::kButtonsLengthCap));
+  pad.buttons_length = std::min(static_cast<int>(buttons.size()),
+                                static_cast<int>(Gamepad::kButtonsLengthCap));
 
-  // Copy buttons state to the WebGamepad buttons[].
+  // Copy buttons state to the Gamepad buttons[].
   for (unsigned int j = 0; j < pad.buttons_length; j++) {
     pad.buttons[j].pressed = buttons[j];
     pad.buttons[j].value = buttons[j];
diff --git a/device/gamepad/gamepad_platform_data_fetcher_android.h b/device/gamepad/gamepad_platform_data_fetcher_android.h
index 760ef9b..158b5cc 100644
--- a/device/gamepad/gamepad_platform_data_fetcher_android.h
+++ b/device/gamepad/gamepad_platform_data_fetcher_android.h
@@ -15,7 +15,7 @@
 #include "device/gamepad/gamepad_data_fetcher.h"
 #include "device/gamepad/gamepad_provider.h"
 #include "device/gamepad/gamepad_standard_mappings.h"
-#include "third_party/WebKit/public/platform/WebGamepads.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 
 namespace device {
 
diff --git a/device/gamepad/gamepad_platform_data_fetcher_linux.cc b/device/gamepad/gamepad_platform_data_fetcher_linux.cc
index bfd23d9..d33f0de7 100644
--- a/device/gamepad/gamepad_platform_data_fetcher_linux.cc
+++ b/device/gamepad/gamepad_platform_data_fetcher_linux.cc
@@ -52,7 +52,7 @@
   if (!base::StringToInt(str, &tmp_idx))
     return false;
   if (tmp_idx < 0 ||
-      tmp_idx >= static_cast<int>(blink::WebGamepads::kItemsLengthCap)) {
+      tmp_idx >= static_cast<int>(device::Gamepads::kItemsLengthCap)) {
     return false;
   }
   *index = tmp_idx;
@@ -64,9 +64,6 @@
 
 namespace device {
 
-using blink::WebGamepad;
-using blink::WebGamepads;
-
 GamepadPlatformDataFetcherLinux::GamepadPlatformDataFetcherLinux() {
   for (size_t i = 0; i < arraysize(device_fd_); ++i) {
     device_fd_[i] = -1;
@@ -74,7 +71,7 @@
 }
 
 GamepadPlatformDataFetcherLinux::~GamepadPlatformDataFetcherLinux() {
-  for (size_t i = 0; i < WebGamepads::kItemsLengthCap; ++i)
+  for (size_t i = 0; i < Gamepads::kItemsLengthCap; ++i)
     CloseFileDescriptorIfValid(device_fd_[i]);
 }
 
@@ -96,7 +93,7 @@
   TRACE_EVENT0("GAMEPAD", "GetGamepadData");
 
   // Update our internal state.
-  for (size_t i = 0; i < WebGamepads::kItemsLengthCap; ++i) {
+  for (size_t i = 0; i < Gamepads::kItemsLengthCap; ++i) {
     if (device_fd_[i] >= 0) {
       ReadDeviceData(i);
     }
@@ -138,7 +135,7 @@
       return;
     }
 
-    WebGamepad& pad = state->data;
+    Gamepad& pad = state->data;
     GamepadStandardMappingFunction& mapper = state->mapper;
 
     const char* vendor_id = udev_device_get_sysattr_value(dev, "id/vendor");
@@ -181,14 +178,14 @@
         name_string + base::StringPrintf(" (%sVendor: %s Product: %s)",
                                          mapper ? "STANDARD GAMEPAD " : "",
                                          vendor_id, product_id);
-    base::TruncateUTF8ToByteSize(id, WebGamepad::kIdLengthCap - 1, &id);
+    base::TruncateUTF8ToByteSize(id, Gamepad::kIdLengthCap - 1, &id);
     base::string16 tmp16 = base::UTF8ToUTF16(id);
     memset(pad.id, 0, sizeof(pad.id));
     tmp16.copy(pad.id, arraysize(pad.id) - 1);
 
     if (mapper) {
       std::string mapping = "standard";
-      base::TruncateUTF8ToByteSize(mapping, WebGamepad::kMappingLengthCap - 1,
+      base::TruncateUTF8ToByteSize(mapping, Gamepad::kMappingLengthCap - 1,
                                    &mapping);
       tmp16 = base::UTF8ToUTF16(mapping);
       memset(pad.mapping, 0, sizeof(pad.mapping));
@@ -228,8 +225,8 @@
 }
 
 void GamepadPlatformDataFetcherLinux::ReadDeviceData(size_t index) {
-  // Linker does not like CHECK_LT(index, WebGamepads::itemsLengthCap). =/
-  if (index >= WebGamepads::kItemsLengthCap) {
+  // Linker does not like CHECK_LT(index, Gamepads::kItemsLengthCap). =/
+  if (index >= Gamepads::kItemsLengthCap) {
     CHECK(false);
     return;
   }
@@ -241,13 +238,13 @@
   int fd = device_fd_[index];
   DCHECK_GE(fd, 0);
 
-  WebGamepad& pad = state->data;
+  Gamepad& pad = state->data;
 
   js_event event;
   while (HANDLE_EINTR(read(fd, &event, sizeof(struct js_event))) > 0) {
     size_t item = event.number;
     if (event.type & JS_EVENT_AXIS) {
-      if (item >= WebGamepad::kAxesLengthCap)
+      if (item >= Gamepad::kAxesLengthCap)
         continue;
 
       pad.axes[item] = event.value / kMaxLinuxAxisValue;
@@ -255,7 +252,7 @@
       if (item >= pad.axes_length)
         pad.axes_length = item + 1;
     } else if (event.type & JS_EVENT_BUTTON) {
-      if (item >= WebGamepad::kButtonsLengthCap)
+      if (item >= Gamepad::kButtonsLengthCap)
         continue;
 
       pad.buttons[item].pressed = event.value;
diff --git a/device/gamepad/gamepad_platform_data_fetcher_linux.h b/device/gamepad/gamepad_platform_data_fetcher_linux.h
index da22ba3..0d51e27 100644
--- a/device/gamepad/gamepad_platform_data_fetcher_linux.h
+++ b/device/gamepad/gamepad_platform_data_fetcher_linux.h
@@ -13,6 +13,7 @@
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "device/gamepad/gamepad_data_fetcher.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 
 extern "C" {
 struct udev_device;
@@ -47,7 +48,7 @@
   void ReadDeviceData(size_t index);
 
   // File descriptor for the /dev/input/js* devices. -1 if not in use.
-  int device_fd_[blink::WebGamepads::kItemsLengthCap];
+  int device_fd_[Gamepads::kItemsLengthCap];
 
   std::unique_ptr<device::UdevLinux> udev_;
 
diff --git a/device/gamepad/gamepad_platform_data_fetcher_mac.h b/device/gamepad/gamepad_platform_data_fetcher_mac.h
index 11808f3..c65cde9e 100644
--- a/device/gamepad/gamepad_platform_data_fetcher_mac.h
+++ b/device/gamepad/gamepad_platform_data_fetcher_mac.h
@@ -16,6 +16,7 @@
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "device/gamepad/gamepad_data_fetcher.h"
+#include "device/gamepad/public/cpp/gamepad.h"
 
 #if defined(__OBJC__)
 @class NSArray;
@@ -77,13 +78,13 @@
   struct AssociatedData {
     int location_id;
     IOHIDDeviceRef device_ref;
-    IOHIDElementRef button_elements[blink::WebGamepad::kButtonsLengthCap];
-    IOHIDElementRef axis_elements[blink::WebGamepad::kAxesLengthCap];
-    CFIndex axis_minimums[blink::WebGamepad::kAxesLengthCap];
-    CFIndex axis_maximums[blink::WebGamepad::kAxesLengthCap];
-    CFIndex axis_report_sizes[blink::WebGamepad::kAxesLengthCap];
+    IOHIDElementRef button_elements[Gamepad::kButtonsLengthCap];
+    IOHIDElementRef axis_elements[Gamepad::kAxesLengthCap];
+    CFIndex axis_minimums[Gamepad::kAxesLengthCap];
+    CFIndex axis_maximums[Gamepad::kAxesLengthCap];
+    CFIndex axis_report_sizes[Gamepad::kAxesLengthCap];
   };
-  AssociatedData associated_[blink::WebGamepads::kItemsLengthCap];
+  AssociatedData associated_[Gamepads::kItemsLengthCap];
 
   DISALLOW_COPY_AND_ASSIGN(GamepadPlatformDataFetcherMac);
 };
diff --git a/device/gamepad/gamepad_platform_data_fetcher_mac.mm b/device/gamepad/gamepad_platform_data_fetcher_mac.mm
index 3e7313e..b091d96 100644
--- a/device/gamepad/gamepad_platform_data_fetcher_mac.mm
+++ b/device/gamepad/gamepad_platform_data_fetcher_mac.mm
@@ -18,19 +18,16 @@
 #import <Foundation/Foundation.h>
 #include <IOKit/hid/IOHIDKeys.h>
 
-using blink::WebGamepad;
-using blink::WebGamepads;
-
 namespace device {
 
 namespace {
 
 void CopyNSStringAsUTF16LittleEndian(NSString* src,
-                                     blink::WebUChar* dest,
+                                     UChar* dest,
                                      size_t dest_len) {
   NSData* as16 = [src dataUsingEncoding:NSUTF16LittleEndianStringEncoding];
   memset(dest, 0, dest_len);
-  [as16 getBytes:dest length:dest_len - sizeof(blink::WebUChar)];
+  [as16 getBytes:dest length:dest_len - sizeof(UChar)];
 }
 
 NSDictionary* DeviceMatching(uint32_t usage_page, uint32_t usage) {
@@ -179,7 +176,7 @@
 bool GamepadPlatformDataFetcherMac::AddButtonsAndAxes(NSArray* elements,
                                                       PadState* state,
                                                       size_t slot) {
-  WebGamepad& pad = state->data;
+  Gamepad& pad = state->data;
   AssociatedData& associated = associated_[slot];
 
   pad.axes_length = 0;
@@ -200,13 +197,13 @@
     if (IOHIDElementGetType(element) == kIOHIDElementTypeInput_Button &&
         usage_page == kButtonUsagePage) {
       uint32_t button_index = usage - 1;
-      if (button_index < WebGamepad::kButtonsLengthCap) {
+      if (button_index < Gamepad::kButtonsLengthCap) {
         associated.button_elements[button_index] = element;
         pad.buttons_length = std::max(pad.buttons_length, button_index + 1);
       }
     } else if (IOHIDElementGetType(element) == kIOHIDElementTypeInput_Misc) {
       uint32_t axis_index = usage - kAxisMinimumUsageNumber;
-      if (axis_index < WebGamepad::kAxesLengthCap) {
+      if (axis_index < Gamepad::kAxesLengthCap) {
         associated.axis_elements[axis_index] = element;
         pad.axes_length = std::max(pad.axes_length, axis_index + 1);
       } else {
@@ -226,19 +223,19 @@
       uint32_t usage_page = IOHIDElementGetUsagePage(element);
       uint32_t usage = IOHIDElementGetUsage(element);
       if (IOHIDElementGetType(element) == kIOHIDElementTypeInput_Misc &&
-          usage - kAxisMinimumUsageNumber >= WebGamepad::kAxesLengthCap &&
+          usage - kAxisMinimumUsageNumber >= Gamepad::kAxesLengthCap &&
           usage_page <= kGameControlsUsagePage) {
-        for (; next_index < WebGamepad::kAxesLengthCap; ++next_index) {
+        for (; next_index < Gamepad::kAxesLengthCap; ++next_index) {
           if (associated.axis_elements[next_index] == NULL)
             break;
         }
-        if (next_index < WebGamepad::kAxesLengthCap) {
+        if (next_index < Gamepad::kAxesLengthCap) {
           associated.axis_elements[next_index] = element;
           pad.axes_length = std::max(pad.axes_length, next_index + 1);
         }
       }
 
-      if (next_index >= WebGamepad::kAxesLengthCap)
+      if (next_index >= Gamepad::kAxesLengthCap)
         break;
     }
   }
@@ -268,19 +265,19 @@
 
 size_t GamepadPlatformDataFetcherMac::GetEmptySlot() {
   // Find a free slot for this device.
-  for (size_t slot = 0; slot < WebGamepads::kItemsLengthCap; ++slot) {
+  for (size_t slot = 0; slot < Gamepads::kItemsLengthCap; ++slot) {
     if (associated_[slot].device_ref == nullptr)
       return slot;
   }
-  return WebGamepads::kItemsLengthCap;
+  return Gamepads::kItemsLengthCap;
 }
 
 size_t GamepadPlatformDataFetcherMac::GetSlotForDevice(IOHIDDeviceRef device) {
-  for (size_t slot = 0; slot < WebGamepads::kItemsLengthCap; ++slot) {
+  for (size_t slot = 0; slot < Gamepads::kItemsLengthCap; ++slot) {
     // If we already have this device, and it's already connected, don't do
     // anything now.
     if (associated_[slot].device_ref == device)
-      return WebGamepads::kItemsLengthCap;
+      return Gamepads::kItemsLengthCap;
   }
   return GetEmptySlot();
 }
@@ -300,7 +297,7 @@
   size_t slot = GetSlotForDevice(device);
 
   // We can't handle this many connected devices.
-  if (slot == WebGamepads::kItemsLengthCap)
+  if (slot == Gamepads::kItemsLengthCap)
     return;
 
   // Clear some state that may have been left behind by previous gamepads
@@ -356,11 +353,11 @@
 
   // Find the index for this device.
   size_t slot;
-  for (slot = 0; slot < WebGamepads::kItemsLengthCap; ++slot) {
+  for (slot = 0; slot < Gamepads::kItemsLengthCap; ++slot) {
     if (associated_[slot].device_ref == device)
       break;
   }
-  DCHECK(slot < WebGamepads::kItemsLengthCap);
+  DCHECK(slot < Gamepads::kItemsLengthCap);
   // Leave associated device_ref so that it will be reconnected in the same
   // location. Simply mark it as disconnected.
   associated_[slot].location_id = 0;
@@ -376,18 +373,18 @@
 
   // Find device slot.
   size_t slot;
-  for (slot = 0; slot < WebGamepads::kItemsLengthCap; ++slot) {
+  for (slot = 0; slot < Gamepads::kItemsLengthCap; ++slot) {
     if (associated_[slot].device_ref == device)
       break;
   }
-  if (slot == WebGamepads::kItemsLengthCap)
+  if (slot == Gamepads::kItemsLengthCap)
     return;
 
   PadState* state = GetPadState(associated_[slot].location_id);
   if (!state)
     return;
 
-  WebGamepad& pad = state->data;
+  Gamepad& pad = state->data;
   AssociatedData& associated = associated_[slot];
 
   uint32_t value_length = IOHIDValueGetLength(value);
@@ -442,7 +439,7 @@
     return;
 
   // Loop through and GetPadState to indicate the devices are still connected.
-  for (size_t slot = 0; slot < WebGamepads::kItemsLengthCap; ++slot) {
+  for (size_t slot = 0; slot < Gamepads::kItemsLengthCap; ++slot) {
     if (associated_[slot].device_ref != nullptr) {
       GetPadState(associated_[slot].location_id);
     }
diff --git a/device/gamepad/gamepad_platform_data_fetcher_win.cc b/device/gamepad/gamepad_platform_data_fetcher_win.cc
index 045460d4..42404e0 100644
--- a/device/gamepad/gamepad_platform_data_fetcher_win.cc
+++ b/device/gamepad/gamepad_platform_data_fetcher_win.cc
@@ -16,8 +16,6 @@
 
 namespace device {
 
-using namespace blink;
-
 namespace {
 
 // See http://goo.gl/5VSJR. These are not available in all versions of the
@@ -38,7 +36,7 @@
   return ((value + 32768.f) / 32767.5f) - 1.f;
 }
 
-const WebUChar* GamepadSubTypeName(BYTE sub_type) {
+const UChar* GamepadSubTypeName(BYTE sub_type) {
   switch (sub_type) {
     case kDeviceSubTypeGamepad:
       return L"GAMEPAD";
@@ -65,7 +63,7 @@
   }
 }
 
-const WebUChar* XInputDllFileName() {
+const UChar* XInputDllFileName() {
   // Xinput.h defines filename (XINPUT_DLL) on different Windows versions, but
   // Xinput.h specifies it in build time. Approach here uses the same values
   // and it is resolving dll filename based on Windows version it is running on.
@@ -114,16 +112,16 @@
       if (!state)
         continue;  // No slot available for this gamepad.
 
-      WebGamepad& pad = state->data;
+      Gamepad& pad = state->data;
 
       if (state->active_state == GAMEPAD_NEWLY_ACTIVE) {
         // This is the first time we've seen this device, so do some one-time
         // initialization
         pad.connected = true;
-        swprintf(pad.id, WebGamepad::kIdLengthCap,
+        swprintf(pad.id, Gamepad::kIdLengthCap,
                  L"Xbox 360 Controller (XInput STANDARD %ls)",
                  GamepadSubTypeName(caps.SubType));
-        swprintf(pad.mapping, WebGamepad::kMappingLengthCap, L"standard");
+        swprintf(pad.mapping, Gamepad::kMappingLengthCap, L"standard");
       }
     }
   }
@@ -156,7 +154,7 @@
   if (!pad_state)
     return;
 
-  WebGamepad& pad = pad_state->data;
+  Gamepad& pad = pad_state->data;
 
   XINPUT_STATE state;
   memset(&state, 0, sizeof(XINPUT_STATE));
diff --git a/device/gamepad/gamepad_platform_data_fetcher_win.h b/device/gamepad/gamepad_platform_data_fetcher_win.h
index df5b5dcd..cedfa195 100644
--- a/device/gamepad/gamepad_platform_data_fetcher_win.h
+++ b/device/gamepad/gamepad_platform_data_fetcher_win.h
@@ -25,7 +25,7 @@
 #include "base/scoped_native_library.h"
 #include "device/gamepad/gamepad_data_fetcher.h"
 #include "device/gamepad/gamepad_standard_mappings.h"
-#include "third_party/WebKit/public/platform/WebGamepads.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 
 namespace device {
 
diff --git a/device/gamepad/gamepad_provider.cc b/device/gamepad/gamepad_provider.cc
index 44d5e5a8..a560aeb 100644
--- a/device/gamepad/gamepad_provider.cc
+++ b/device/gamepad/gamepad_provider.cc
@@ -24,9 +24,6 @@
 #include "device/gamepad/gamepad_user_gesture.h"
 #include "mojo/public/cpp/system/platform_handle.h"
 
-using blink::WebGamepad;
-using blink::WebGamepads;
-
 namespace device {
 
 GamepadProvider::ClosureAndThread::ClosureAndThread(
@@ -102,8 +99,8 @@
                                       true /* read_only */);
 }
 
-void GamepadProvider::GetCurrentGamepadData(WebGamepads* data) {
-  const WebGamepads* pads = gamepad_shared_buffer_->buffer();
+void GamepadProvider::GetCurrentGamepadData(Gamepads* data) {
+  const Gamepads* pads = gamepad_shared_buffer_->buffer();
   base::AutoLock lock(shared_memory_lock_);
   *data = *pads;
 }
@@ -227,8 +224,8 @@
 
   bool changed;
 
-  ANNOTATE_BENIGN_RACE_SIZED(gamepad_shared_buffer_->buffer(),
-                             sizeof(WebGamepads), "Racey reads are discarded");
+  ANNOTATE_BENIGN_RACE_SIZED(gamepad_shared_buffer_->buffer(), sizeof(Gamepads),
+                             "Racey reads are discarded");
 
   {
     base::AutoLock lock(devices_changed_lock_);
@@ -244,12 +241,12 @@
     it->GetGamepadData(changed);
   }
 
-  blink::WebGamepads* buffer = gamepad_shared_buffer_->buffer();
+  Gamepads* buffer = gamepad_shared_buffer_->buffer();
 
   // Send out disconnect events using the last polled data before we wipe it out
   // in the mapping step.
   if (ever_had_user_gesture_) {
-    for (unsigned i = 0; i < WebGamepads::kItemsLengthCap; ++i) {
+    for (unsigned i = 0; i < Gamepads::kItemsLengthCap; ++i) {
       PadState& state = pad_states_.get()[i];
 
       if (!state.active_state && state.source != GAMEPAD_SOURCE_NONE) {
@@ -267,7 +264,7 @@
     // Acquire the SeqLock. There is only ever one writer to this data.
     // See gamepad_shared_buffer.h.
     gamepad_shared_buffer_->WriteBegin();
-    for (unsigned i = 0; i < WebGamepads::kItemsLengthCap; ++i) {
+    for (unsigned i = 0; i < Gamepads::kItemsLengthCap; ++i) {
       PadState& state = pad_states_.get()[i];
       // Must run through the map+sanitize here or CheckForUserGesture may fail.
       MapAndSanitizeGamepadData(&state, &buffer->items[i], sanitize_);
@@ -276,7 +273,7 @@
   }
 
   if (ever_had_user_gesture_) {
-    for (unsigned i = 0; i < WebGamepads::kItemsLengthCap; ++i) {
+    for (unsigned i = 0; i < Gamepads::kItemsLengthCap; ++i) {
       PadState& state = pad_states_.get()[i];
 
       if (state.active_state) {
@@ -312,7 +309,7 @@
 
 void GamepadProvider::OnGamepadConnectionChange(bool connected,
                                                 int index,
-                                                const WebGamepad& pad) {
+                                                const Gamepad& pad) {
   if (connection_change_client_)
     connection_change_client_->OnGamepadConnectionChange(connected, index, pad);
 }
@@ -322,7 +319,7 @@
   if (user_gesture_observers_.empty() && ever_had_user_gesture_)
     return;
 
-  const WebGamepads* pads = gamepad_shared_buffer_->buffer();
+  const Gamepads* pads = gamepad_shared_buffer_->buffer();
   if (GamepadsHaveUserGesture(*pads)) {
     ever_had_user_gesture_ = true;
     for (size_t i = 0; i < user_gesture_observers_.size(); i++) {
diff --git a/device/gamepad/gamepad_provider.h b/device/gamepad/gamepad_provider.h
index bc54d94..6dea63ac 100644
--- a/device/gamepad/gamepad_provider.h
+++ b/device/gamepad/gamepad_provider.h
@@ -18,10 +18,9 @@
 #include "device/gamepad/gamepad_export.h"
 #include "device/gamepad/gamepad_pad_state_provider.h"
 #include "device/gamepad/gamepad_shared_buffer.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 #include "mojo/public/cpp/system/buffer.h"
 
-#include "third_party/WebKit/public/platform/WebGamepads.h"
-
 namespace base {
 class SingleThreadTaskRunner;
 class Thread;
@@ -35,7 +34,7 @@
  public:
   virtual void OnGamepadConnectionChange(bool connected,
                                          int index,
-                                         const blink::WebGamepad& pad) = 0;
+                                         const Gamepad& pad) = 0;
 };
 
 class DEVICE_GAMEPAD_EXPORT GamepadProvider
@@ -63,7 +62,7 @@
   void AddGamepadDataFetcher(GamepadDataFetcher* fetcher);
   void RemoveGamepadDataFetcher(GamepadDataFetcher* fetcher);
 
-  void GetCurrentGamepadData(blink::WebGamepads* data);
+  void GetCurrentGamepadData(Gamepads* data);
 
   // Pause and resume the background polling thread. Can be called from any
   // thread.
@@ -101,9 +100,7 @@
   void DoPoll();
   void ScheduleDoPoll();
 
-  void OnGamepadConnectionChange(bool connected,
-                                 int index,
-                                 const blink::WebGamepad& pad);
+  void OnGamepadConnectionChange(bool connected, int index, const Gamepad& pad);
 
   // Checks the gamepad state to see if the user has interacted with it.
   void CheckForUserGesture();
diff --git a/device/gamepad/gamepad_provider_unittest.cc b/device/gamepad/gamepad_provider_unittest.cc
index cef3355..d3d581b 100644
--- a/device/gamepad/gamepad_provider_unittest.cc
+++ b/device/gamepad/gamepad_provider_unittest.cc
@@ -19,8 +19,6 @@
 
 namespace {
 
-using blink::WebGamepads;
-
 // Helper class to generate and record user gesture callbacks.
 class UserGestureListener {
  public:
@@ -43,7 +41,7 @@
 // Main test fixture
 class GamepadProviderTest : public testing::Test, public GamepadTestHelper {
  public:
-  GamepadProvider* CreateProvider(const WebGamepads& test_data) {
+  GamepadProvider* CreateProvider(const Gamepads& test_data) {
     mock_data_fetcher_ = new MockGamepadDataFetcher(test_data);
     provider_.reset(new GamepadProvider(
         nullptr, std::unique_ptr<GamepadDataFetcher>(mock_data_fetcher_)));
@@ -73,12 +71,12 @@
   }
 
   void ReadGamepadHardwareBuffer(GamepadHardwareBuffer* buffer,
-                                 WebGamepads* output) {
-    memset(output, 0, sizeof(WebGamepads));
+                                 Gamepads* output) {
+    memset(output, 0, sizeof(Gamepads));
     base::subtle::Atomic32 version;
     do {
       version = buffer->seqlock.ReadBegin();
-      memcpy(output, &buffer->data, sizeof(WebGamepads));
+      memcpy(output, &buffer->data, sizeof(Gamepads));
     } while (buffer->seqlock.ReadRetry(version));
   }
 
@@ -94,8 +92,8 @@
 };
 
 TEST_F(GamepadProviderTest, PollingAccess) {
-  WebGamepads test_data;
-  memset(&test_data, 0, sizeof(WebGamepads));
+  Gamepads test_data;
+  memset(&test_data, 0, sizeof(Gamepads));
   test_data.items[0].connected = true;
   test_data.items[0].timestamp = 0;
   test_data.items[0].buttons_length = 1;
@@ -124,7 +122,7 @@
   // Wait until the shared memory buffer has been written at least once.
   WaitForData(buffer);
 
-  WebGamepads output;
+  Gamepads output;
   ReadGamepadHardwareBuffer(buffer, &output);
 
   EXPECT_EQ(1u, output.items[0].buttons_length);
@@ -136,7 +134,7 @@
 }
 
 TEST_F(GamepadProviderTest, ConnectDisconnectMultiple) {
-  WebGamepads test_data;
+  Gamepads test_data;
   test_data.items[0].connected = true;
   test_data.items[0].timestamp = 0;
   test_data.items[0].axes_length = 2;
@@ -149,7 +147,7 @@
   test_data.items[1].axes[0] = 1.f;
   test_data.items[1].axes[1] = -.5f;
 
-  WebGamepads test_data_onedisconnected;
+  Gamepads test_data_onedisconnected;
   test_data_onedisconnected.items[1].connected = true;
   test_data_onedisconnected.items[1].timestamp = 0;
   test_data_onedisconnected.items[1].axes_length = 2;
@@ -175,7 +173,7 @@
   // Wait until the shared memory buffer has been written at least once.
   WaitForData(buffer);
 
-  WebGamepads output;
+  Gamepads output;
   ReadGamepadHardwareBuffer(buffer, &output);
 
   EXPECT_EQ(2u, output.items[0].axes_length);
@@ -199,7 +197,7 @@
 
 // Tests that waiting for a user gesture works properly.
 TEST_F(GamepadProviderTest, UserGesture) {
-  WebGamepads no_button_data;
+  Gamepads no_button_data;
   no_button_data.items[0].connected = true;
   no_button_data.items[0].timestamp = 0;
   no_button_data.items[0].buttons_length = 1;
@@ -209,7 +207,7 @@
   no_button_data.items[0].axes[0] = 0.f;
   no_button_data.items[0].axes[1] = .4f;
 
-  WebGamepads button_down_data = no_button_data;
+  Gamepads button_down_data = no_button_data;
   button_down_data.items[0].buttons[0].value = 1.f;
   button_down_data.items[0].buttons[0].pressed = true;
 
@@ -252,7 +250,7 @@
 
 // Tests that waiting for a user gesture works properly.
 TEST_F(GamepadProviderTest, Sanitization) {
-  WebGamepads active_data;
+  Gamepads active_data;
   active_data.items[0].connected = true;
   active_data.items[0].timestamp = 0;
   active_data.items[0].buttons_length = 1;
@@ -261,7 +259,7 @@
   active_data.items[0].buttons[0].pressed = true;
   active_data.items[0].axes[0] = -1.f;
 
-  WebGamepads zero_data;
+  Gamepads zero_data;
   zero_data.items[0].connected = true;
   zero_data.items[0].timestamp = 0;
   zero_data.items[0].buttons_length = 1;
@@ -290,7 +288,7 @@
   // Wait until the shared memory buffer has been written at least once.
   WaitForData(buffer);
 
-  WebGamepads output;
+  Gamepads output;
   ReadGamepadHardwareBuffer(buffer, &output);
 
   // Initial data should all be zeroed out due to sanitization, even though the
diff --git a/device/gamepad/gamepad_service.cc b/device/gamepad/gamepad_service.cc
index 2fd5354..3335b256 100644
--- a/device/gamepad/gamepad_service.cc
+++ b/device/gamepad/gamepad_service.cc
@@ -108,7 +108,7 @@
 
 void GamepadService::OnGamepadConnectionChange(bool connected,
                                                int index,
-                                               const blink::WebGamepad& pad) {
+                                               const Gamepad& pad) {
   if (connected) {
     main_thread_task_runner_->PostTask(
         FROM_HERE, base::Bind(&GamepadService::OnGamepadConnected,
@@ -120,8 +120,7 @@
   }
 }
 
-void GamepadService::OnGamepadConnected(int index,
-                                        const blink::WebGamepad& pad) {
+void GamepadService::OnGamepadConnected(int index, const Gamepad& pad) {
   DCHECK(main_thread_task_runner_->BelongsToCurrentThread());
 
   for (ConsumerSet::iterator it = consumers_.begin(); it != consumers_.end();
@@ -131,8 +130,7 @@
   }
 }
 
-void GamepadService::OnGamepadDisconnected(int index,
-                                           const blink::WebGamepad& pad) {
+void GamepadService::OnGamepadDisconnected(int index, const Gamepad& pad) {
   DCHECK(main_thread_task_runner_->BelongsToCurrentThread());
 
   for (ConsumerSet::iterator it = consumers_.begin(); it != consumers_.end();
@@ -166,10 +164,10 @@
     if (!it->did_observe_user_gesture && it->is_active) {
       const ConsumerInfo& info = *it;
       info.did_observe_user_gesture = true;
-      blink::WebGamepads gamepads;
+      Gamepads gamepads;
       provider_->GetCurrentGamepadData(&gamepads);
-      for (unsigned i = 0; i < blink::WebGamepads::kItemsLengthCap; ++i) {
-        const blink::WebGamepad& pad = gamepads.items[i];
+      for (unsigned i = 0; i < Gamepads::kItemsLengthCap; ++i) {
+        const Gamepad& pad = gamepads.items[i];
         if (pad.connected)
           info.consumer->OnGamepadConnected(i, pad);
       }
diff --git a/device/gamepad/gamepad_service.h b/device/gamepad/gamepad_service.h
index e9ffbe86..c5e4aaf 100644
--- a/device/gamepad/gamepad_service.h
+++ b/device/gamepad/gamepad_service.h
@@ -19,10 +19,6 @@
 class SingleThreadTaskRunner;
 }
 
-namespace blink {
-class WebGamepad;
-}
-
 namespace content {
 class GamepadServiceTestConstructor;
 }
@@ -83,10 +79,10 @@
   void Terminate();
 
   // Called on IO thread when a gamepad is connected.
-  void OnGamepadConnected(int index, const blink::WebGamepad& pad);
+  void OnGamepadConnected(int index, const Gamepad& pad);
 
   // Called on IO thread when a gamepad is disconnected.
-  void OnGamepadDisconnected(int index, const blink::WebGamepad& pad);
+  void OnGamepadDisconnected(int index, const Gamepad& pad);
 
  private:
   friend struct base::DefaultSingletonTraits<GamepadService>;
@@ -107,7 +103,7 @@
 
   void OnGamepadConnectionChange(bool connected,
                                  int index,
-                                 const blink::WebGamepad& pad) override;
+                                 const Gamepad& pad) override;
 
   void SetSanitizationEnabled(bool sanitize);
 
diff --git a/device/gamepad/gamepad_service_unittest.cc b/device/gamepad/gamepad_service_unittest.cc
index 97ce7813..86aad62 100644
--- a/device/gamepad/gamepad_service_unittest.cc
+++ b/device/gamepad/gamepad_service_unittest.cc
@@ -18,21 +18,17 @@
 namespace device {
 
 namespace {
-static const int kNumberOfGamepads = blink::WebGamepads::kItemsLengthCap;
+static const int kNumberOfGamepads = Gamepads::kItemsLengthCap;
 }
 
-using blink::WebGamepads;
-
 class ConnectionListener : public device::GamepadConsumer {
  public:
   ConnectionListener() { ClearCounters(); }
 
-  void OnGamepadConnected(unsigned index,
-                          const blink::WebGamepad& gamepad) override {
+  void OnGamepadConnected(unsigned index, const Gamepad& gamepad) override {
     connected_counter_++;
   }
-  void OnGamepadDisconnected(unsigned index,
-                             const blink::WebGamepad& gamepad) override {
+  void OnGamepadDisconnected(unsigned index, const Gamepad& gamepad) override {
     disconnected_counter_++;
   }
 
@@ -71,7 +67,7 @@
   device::MockGamepadDataFetcher* fetcher_;
   GamepadService* service_;
   std::unique_ptr<ConnectionListener> connection_listener_;
-  WebGamepads test_data_;
+  Gamepads test_data_;
 
   DISALLOW_COPY_AND_ASSIGN(GamepadServiceTest);
 };
diff --git a/device/gamepad/gamepad_shared_buffer.cc b/device/gamepad/gamepad_shared_buffer.cc
index 66ada77..a8c22161 100644
--- a/device/gamepad/gamepad_shared_buffer.cc
+++ b/device/gamepad/gamepad_shared_buffer.cc
@@ -14,7 +14,7 @@
   void* mem = shared_memory_.memory();
   DCHECK(mem);
   hardware_buffer_ = new (mem) GamepadHardwareBuffer();
-  memset(&(hardware_buffer_->data), 0, sizeof(blink::WebGamepads));
+  memset(&(hardware_buffer_->data), 0, sizeof(Gamepads));
 }
 
 GamepadSharedBuffer::~GamepadSharedBuffer() {}
@@ -23,7 +23,7 @@
   return &shared_memory_;
 }
 
-blink::WebGamepads* GamepadSharedBuffer::buffer() {
+Gamepads* GamepadSharedBuffer::buffer() {
   return &(hardware_buffer()->data);
 }
 
diff --git a/device/gamepad/gamepad_shared_buffer.h b/device/gamepad/gamepad_shared_buffer.h
index b98e9616..1eb7b93 100644
--- a/device/gamepad/gamepad_shared_buffer.h
+++ b/device/gamepad/gamepad_shared_buffer.h
@@ -8,7 +8,7 @@
 #include "base/memory/shared_memory.h"
 #include "device/base/synchronization/shared_memory_seqlock_buffer.h"
 #include "device/gamepad/gamepad_export.h"
-#include "third_party/WebKit/public/platform/WebGamepads.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 
 namespace device {
 
@@ -25,7 +25,7 @@
 
 */
 
-typedef SharedMemorySeqLockBuffer<blink::WebGamepads> GamepadHardwareBuffer;
+typedef SharedMemorySeqLockBuffer<Gamepads> GamepadHardwareBuffer;
 
 class DEVICE_GAMEPAD_EXPORT GamepadSharedBuffer {
  public:
@@ -33,7 +33,7 @@
   ~GamepadSharedBuffer();
 
   base::SharedMemory* shared_memory();
-  blink::WebGamepads* buffer();
+  Gamepads* buffer();
   GamepadHardwareBuffer* hardware_buffer();
 
   void WriteBegin();
diff --git a/device/gamepad/gamepad_standard_mappings.cc b/device/gamepad/gamepad_standard_mappings.cc
index e4aaf69..d467574 100644
--- a/device/gamepad/gamepad_standard_mappings.cc
+++ b/device/gamepad/gamepad_standard_mappings.cc
@@ -6,38 +6,37 @@
 
 namespace device {
 
-blink::WebGamepadButton AxisToButton(float input) {
+GamepadButton AxisToButton(float input) {
   float value = (input + 1.f) / 2.f;
   bool pressed = value > kDefaultButtonPressedThreshold;
   bool touched = value > 0.0f;
-  return blink::WebGamepadButton(pressed, touched, value);
+  return GamepadButton(pressed, touched, value);
 }
 
-blink::WebGamepadButton AxisNegativeAsButton(float input) {
+GamepadButton AxisNegativeAsButton(float input) {
   float value = (input < -0.5f) ? 1.f : 0.f;
   bool pressed = value > kDefaultButtonPressedThreshold;
   bool touched = value > 0.0f;
-  return blink::WebGamepadButton(pressed, touched, value);
+  return GamepadButton(pressed, touched, value);
 }
 
-blink::WebGamepadButton AxisPositiveAsButton(float input) {
+GamepadButton AxisPositiveAsButton(float input) {
   float value = (input > 0.5f) ? 1.f : 0.f;
   bool pressed = value > kDefaultButtonPressedThreshold;
   bool touched = value > 0.0f;
-  return blink::WebGamepadButton(pressed, touched, value);
+  return GamepadButton(pressed, touched, value);
 }
 
-blink::WebGamepadButton ButtonFromButtonAndAxis(blink::WebGamepadButton button,
-                                                float axis) {
+GamepadButton ButtonFromButtonAndAxis(GamepadButton button, float axis) {
   float value = (axis + 1.f) / 2.f;
-  return blink::WebGamepadButton(button.pressed, button.touched, value);
+  return GamepadButton(button.pressed, button.touched, value);
 }
 
-blink::WebGamepadButton NullButton() {
-  return blink::WebGamepadButton(false, false, 0.0);
+GamepadButton NullButton() {
+  return GamepadButton(false, false, 0.0);
 }
 
-void DpadFromAxis(blink::WebGamepad* mapped, float dir) {
+void DpadFromAxis(Gamepad* mapped, float dir) {
   bool up = false;
   bool right = false;
   bool down = false;
diff --git a/device/gamepad/gamepad_standard_mappings.h b/device/gamepad/gamepad_standard_mappings.h
index b924533..bb31cff 100644
--- a/device/gamepad/gamepad_standard_mappings.h
+++ b/device/gamepad/gamepad_standard_mappings.h
@@ -6,13 +6,12 @@
 #define DEVICE_GAMEPAD_GAMEPAD_STANDARD_MAPPINGS_H_
 
 #include "base/strings/string_piece.h"
-#include "third_party/WebKit/public/platform/WebGamepad.h"
+#include "device/gamepad/public/cpp/gamepad.h"
 
 namespace device {
 
-typedef void (*GamepadStandardMappingFunction)(
-    const blink::WebGamepad& original,
-    blink::WebGamepad* mapped);
+typedef void (*GamepadStandardMappingFunction)(const Gamepad& original,
+                                               Gamepad* mapped);
 
 GamepadStandardMappingFunction GetGamepadStandardMappingFunction(
     const base::StringPiece& vendor_id,
@@ -63,13 +62,12 @@
 const float kDefaultButtonPressedThreshold = 30.f / 255.f;
 
 // Common mapping functions
-blink::WebGamepadButton AxisToButton(float input);
-blink::WebGamepadButton AxisNegativeAsButton(float input);
-blink::WebGamepadButton AxisPositiveAsButton(float input);
-blink::WebGamepadButton ButtonFromButtonAndAxis(blink::WebGamepadButton button,
-                                                float axis);
-blink::WebGamepadButton NullButton();
-void DpadFromAxis(blink::WebGamepad* mapped, float dir);
+GamepadButton AxisToButton(float input);
+GamepadButton AxisNegativeAsButton(float input);
+GamepadButton AxisPositiveAsButton(float input);
+GamepadButton ButtonFromButtonAndAxis(GamepadButton button, float axis);
+GamepadButton NullButton();
+void DpadFromAxis(Gamepad* mapped, float dir);
 
 }  // namespace device
 
diff --git a/device/gamepad/gamepad_standard_mappings_linux.cc b/device/gamepad/gamepad_standard_mappings_linux.cc
index 9de994353..17b8afc 100644
--- a/device/gamepad/gamepad_standard_mappings_linux.cc
+++ b/device/gamepad/gamepad_standard_mappings_linux.cc
@@ -11,8 +11,7 @@
 
 namespace {
 
-void MapperXInputStyleGamepad(const blink::WebGamepad& input,
-                              blink::WebGamepad* mapped) {
+void MapperXInputStyleGamepad(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_LEFT_TRIGGER] = AxisToButton(input.axes[2]);
   mapped->buttons[BUTTON_INDEX_RIGHT_TRIGGER] = AxisToButton(input.axes[5]);
@@ -32,8 +31,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperXboxOneHidGamepad(const blink::WebGamepad& input,
-                             blink::WebGamepad* mapped) {
+void MapperXboxOneHidGamepad(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
 
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[0];
@@ -59,8 +57,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperLakeviewResearch(const blink::WebGamepad& input,
-                            blink::WebGamepad* mapped) {
+void MapperLakeviewResearch(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[2];
   mapped->buttons[BUTTON_INDEX_TERTIARY] = input.buttons[3];
@@ -80,8 +77,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperPlaystationSixAxis(const blink::WebGamepad& input,
-                              blink::WebGamepad* mapped) {
+void MapperPlaystationSixAxis(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[14];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[13];
@@ -105,8 +101,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperDualshock4(const blink::WebGamepad& input,
-                      blink::WebGamepad* mapped) {
+void MapperDualshock4(const Gamepad& input, Gamepad* mapped) {
   enum Dualshock4Buttons {
     DUALSHOCK_BUTTON_TOUCHPAD = BUTTON_INDEX_COUNT,
     DUALSHOCK_BUTTON_COUNT
@@ -138,7 +133,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperIBuffalo(const blink::WebGamepad& input, blink::WebGamepad* mapped) {
+void MapperIBuffalo(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[1];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[0];
@@ -157,7 +152,7 @@
   mapped->axes_length = 2;
 }
 
-void MapperXGEAR(const blink::WebGamepad& input, blink::WebGamepad* mapped) {
+void MapperXGEAR(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[2];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[1];
@@ -178,8 +173,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperDragonRiseGeneric(const blink::WebGamepad& input,
-                             blink::WebGamepad* mapped) {
+void MapperDragonRiseGeneric(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_DPAD_UP] = AxisNegativeAsButton(input.axes[6]);
   mapped->buttons[BUTTON_INDEX_DPAD_DOWN] = AxisPositiveAsButton(input.axes[6]);
@@ -194,8 +188,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperOnLiveWireless(const blink::WebGamepad& input,
-                          blink::WebGamepad* mapped) {
+void MapperOnLiveWireless(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_LEFT_TRIGGER] = AxisToButton(input.axes[2]);
   mapped->buttons[BUTTON_INDEX_RIGHT_TRIGGER] = AxisToButton(input.axes[5]);
@@ -216,7 +209,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperADT1(const blink::WebGamepad& input, blink::WebGamepad* mapped) {
+void MapperADT1(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_LEFT_TRIGGER] = AxisToButton(input.axes[5]);
   mapped->buttons[BUTTON_INDEX_RIGHT_TRIGGER] = AxisToButton(input.axes[4]);
@@ -235,7 +228,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperNvShield(const blink::WebGamepad& input, blink::WebGamepad* mapped) {
+void MapperNvShield(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_LEFT_TRIGGER] = AxisToButton(input.axes[5]);
   mapped->buttons[BUTTON_INDEX_RIGHT_TRIGGER] = AxisToButton(input.axes[4]);
@@ -254,7 +247,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperOUYA(const blink::WebGamepad& input, blink::WebGamepad* mapped) {
+void MapperOUYA(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[0];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[3];
@@ -280,8 +273,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperRazerServal(const blink::WebGamepad& input,
-                       blink::WebGamepad* mapped) {
+void MapperRazerServal(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_LEFT_TRIGGER] = AxisToButton(input.axes[5]);
   mapped->buttons[BUTTON_INDEX_RIGHT_TRIGGER] = AxisToButton(input.axes[4]);
@@ -299,7 +291,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperMogaPro(const blink::WebGamepad& input, blink::WebGamepad* mapped) {
+void MapperMogaPro(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_LEFT_TRIGGER] = AxisToButton(input.axes[5]);
   mapped->buttons[BUTTON_INDEX_RIGHT_TRIGGER] = AxisToButton(input.axes[4]);
@@ -317,8 +309,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperSamsung_EI_GP20(const blink::WebGamepad& input,
-                           blink::WebGamepad* mapped) {
+void MapperSamsung_EI_GP20(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[0];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[1];
diff --git a/device/gamepad/gamepad_standard_mappings_mac.mm b/device/gamepad/gamepad_standard_mappings_mac.mm
index 5fb8f09..27e12ce 100644
--- a/device/gamepad/gamepad_standard_mappings_mac.mm
+++ b/device/gamepad/gamepad_standard_mappings_mac.mm
@@ -11,8 +11,7 @@
 
 namespace {
 
-void MapperXbox360Gamepad(const blink::WebGamepad& input,
-                          blink::WebGamepad* mapped) {
+void MapperXbox360Gamepad(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_LEFT_TRIGGER] = AxisToButton(input.axes[2]);
   mapped->buttons[BUTTON_INDEX_RIGHT_TRIGGER] = AxisToButton(input.axes[5]);
@@ -31,8 +30,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperXboxOneHidGamepad(const blink::WebGamepad& input,
-                             blink::WebGamepad* mapped) {
+void MapperXboxOneHidGamepad(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
 
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[0];
@@ -54,8 +52,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperPlaystationSixAxis(const blink::WebGamepad& input,
-                              blink::WebGamepad* mapped) {
+void MapperPlaystationSixAxis(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[14];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[13];
@@ -91,8 +88,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperDualshock4(const blink::WebGamepad& input,
-                      blink::WebGamepad* mapped) {
+void MapperDualshock4(const Gamepad& input, Gamepad* mapped) {
   enum Dualshock4Buttons {
     DUALSHOCK_BUTTON_TOUCHPAD = BUTTON_INDEX_COUNT,
     DUALSHOCK_BUTTON_COUNT
@@ -120,7 +116,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperIBuffalo(const blink::WebGamepad& input, blink::WebGamepad* mapped) {
+void MapperIBuffalo(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[1];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[0];
@@ -139,8 +135,7 @@
   mapped->axes_length = 2;
 }
 
-void MapperDirectInputStyle(const blink::WebGamepad& input,
-                            blink::WebGamepad* mapped) {
+void MapperDirectInputStyle(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[1];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[2];
@@ -151,8 +146,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperMacallyIShock(const blink::WebGamepad& input,
-                         blink::WebGamepad* mapped) {
+void MapperMacallyIShock(const Gamepad& input, Gamepad* mapped) {
   enum IShockButtons {
     ISHOCK_BUTTON_C = BUTTON_INDEX_COUNT,
     ISHOCK_BUTTON_D,
@@ -190,7 +184,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperXGEAR(const blink::WebGamepad& input, blink::WebGamepad* mapped) {
+void MapperXGEAR(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[2];
   mapped->buttons[BUTTON_INDEX_TERTIARY] = input.buttons[3];
@@ -206,8 +200,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperSmartJoyPLUS(const blink::WebGamepad& input,
-                        blink::WebGamepad* mapped) {
+void MapperSmartJoyPLUS(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[2];
   mapped->buttons[BUTTON_INDEX_TERTIARY] = input.buttons[3];
@@ -224,8 +217,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperDragonRiseGeneric(const blink::WebGamepad& input,
-                             blink::WebGamepad* mapped) {
+void MapperDragonRiseGeneric(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   DpadFromAxis(mapped, input.axes[9]);
   mapped->axes[AXIS_INDEX_LEFT_STICK_X] = input.axes[0];
@@ -236,8 +228,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperOnLiveWireless(const blink::WebGamepad& input,
-                          blink::WebGamepad* mapped) {
+void MapperOnLiveWireless(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[0];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[1];
@@ -260,7 +251,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperADT1(const blink::WebGamepad& input, blink::WebGamepad* mapped) {
+void MapperADT1(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[0];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[1];
@@ -282,7 +273,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperNvShield(const blink::WebGamepad& input, blink::WebGamepad* mapped) {
+void MapperNvShield(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[0];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[1];
@@ -304,7 +295,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperOUYA(const blink::WebGamepad& input, blink::WebGamepad* mapped) {
+void MapperOUYA(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[0];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[3];
@@ -330,8 +321,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperRazerServal(const blink::WebGamepad& input,
-                       blink::WebGamepad* mapped) {
+void MapperRazerServal(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[0];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[1];
@@ -352,7 +342,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperMogaPro(const blink::WebGamepad& input, blink::WebGamepad* mapped) {
+void MapperMogaPro(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[0];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[1];
diff --git a/device/gamepad/gamepad_standard_mappings_win.cc b/device/gamepad/gamepad_standard_mappings_win.cc
index 1a11227..b73f119 100644
--- a/device/gamepad/gamepad_standard_mappings_win.cc
+++ b/device/gamepad/gamepad_standard_mappings_win.cc
@@ -11,8 +11,7 @@
 
 namespace {
 
-void MapperLogitechDualAction(const blink::WebGamepad& input,
-                              blink::WebGamepad* mapped) {
+void MapperLogitechDualAction(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[1];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[2];
@@ -24,8 +23,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void Mapper2Axes8Keys(const blink::WebGamepad& input,
-                      blink::WebGamepad* mapped) {
+void Mapper2Axes8Keys(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[2];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[1];
@@ -38,18 +36,17 @@
       AxisPositiveAsButton(input.axes[0]);
 
   // Missing buttons
-  mapped->buttons[BUTTON_INDEX_LEFT_TRIGGER] = blink::WebGamepadButton();
-  mapped->buttons[BUTTON_INDEX_RIGHT_TRIGGER] = blink::WebGamepadButton();
-  mapped->buttons[BUTTON_INDEX_LEFT_THUMBSTICK] = blink::WebGamepadButton();
-  mapped->buttons[BUTTON_INDEX_RIGHT_THUMBSTICK] = blink::WebGamepadButton();
-  mapped->buttons[BUTTON_INDEX_META] = blink::WebGamepadButton();
+  mapped->buttons[BUTTON_INDEX_LEFT_TRIGGER] = GamepadButton();
+  mapped->buttons[BUTTON_INDEX_RIGHT_TRIGGER] = GamepadButton();
+  mapped->buttons[BUTTON_INDEX_LEFT_THUMBSTICK] = GamepadButton();
+  mapped->buttons[BUTTON_INDEX_RIGHT_THUMBSTICK] = GamepadButton();
+  mapped->buttons[BUTTON_INDEX_META] = GamepadButton();
 
   mapped->buttons_length = BUTTON_INDEX_COUNT - 1;
   mapped->axes_length = 0;
 }
 
-void MapperDualshock4(const blink::WebGamepad& input,
-                      blink::WebGamepad* mapped) {
+void MapperDualshock4(const Gamepad& input, Gamepad* mapped) {
   enum Dualshock4Buttons {
     DUALSHOCK_BUTTON_TOUCHPAD = BUTTON_INDEX_COUNT,
     DUALSHOCK_BUTTON_COUNT
@@ -77,7 +74,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperIBuffalo(const blink::WebGamepad& input, blink::WebGamepad* mapped) {
+void MapperIBuffalo(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[1];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[0];
@@ -96,8 +93,7 @@
   mapped->axes_length = 2;
 }
 
-void MapperOnLiveWireless(const blink::WebGamepad& input,
-                          blink::WebGamepad* mapped) {
+void MapperOnLiveWireless(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[0];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[1];
@@ -120,7 +116,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperADT1(const blink::WebGamepad& input, blink::WebGamepad* mapped) {
+void MapperADT1(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[0];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[1];
@@ -142,7 +138,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperNvShield(const blink::WebGamepad& input, blink::WebGamepad* mapped) {
+void MapperNvShield(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[0];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[1];
@@ -164,7 +160,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperOUYA(const blink::WebGamepad& input, blink::WebGamepad* mapped) {
+void MapperOUYA(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[0];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[3];
@@ -190,8 +186,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperRazerServal(const blink::WebGamepad& input,
-                       blink::WebGamepad* mapped) {
+void MapperRazerServal(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[0];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[1];
@@ -212,7 +207,7 @@
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
-void MapperMogaPro(const blink::WebGamepad& input, blink::WebGamepad* mapped) {
+void MapperMogaPro(const Gamepad& input, Gamepad* mapped) {
   *mapped = input;
   mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[0];
   mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[1];
diff --git a/device/gamepad/gamepad_test_helpers.cc b/device/gamepad/gamepad_test_helpers.cc
index cd1f5cda..d6e27d47 100644
--- a/device/gamepad/gamepad_test_helpers.cc
+++ b/device/gamepad/gamepad_test_helpers.cc
@@ -6,8 +6,7 @@
 
 namespace device {
 
-MockGamepadDataFetcher::MockGamepadDataFetcher(
-    const blink::WebGamepads& test_data)
+MockGamepadDataFetcher::MockGamepadDataFetcher(const Gamepads& test_data)
     : test_data_(test_data),
       read_data_(base::WaitableEvent::ResetPolicy::AUTOMATIC,
                  base::WaitableEvent::InitialState::NOT_SIGNALED) {}
@@ -22,11 +21,11 @@
   {
     base::AutoLock lock(lock_);
 
-    for (unsigned int i = 0; i < blink::WebGamepads::kItemsLengthCap; ++i) {
+    for (unsigned int i = 0; i < Gamepads::kItemsLengthCap; ++i) {
       if (test_data_.items[i].connected) {
         PadState* pad = GetPadState(i);
         if (pad)
-          memcpy(&pad->data, &test_data_.items[i], sizeof(blink::WebGamepad));
+          memcpy(&pad->data, &test_data_.items[i], sizeof(Gamepad));
       }
     }
   }
@@ -46,7 +45,7 @@
   WaitForDataRead();
 }
 
-void MockGamepadDataFetcher::SetTestData(const blink::WebGamepads& new_data) {
+void MockGamepadDataFetcher::SetTestData(const Gamepads& new_data) {
   base::AutoLock lock(lock_);
   test_data_ = new_data;
 }
@@ -56,7 +55,7 @@
 GamepadTestHelper::~GamepadTestHelper() {}
 
 GamepadServiceTestConstructor::GamepadServiceTestConstructor(
-    const blink::WebGamepads& test_data) {
+    const Gamepads& test_data) {
   data_fetcher_ = new MockGamepadDataFetcher(test_data);
   gamepad_service_ =
       new GamepadService(std::unique_ptr<GamepadDataFetcher>(data_fetcher_));
diff --git a/device/gamepad/gamepad_test_helpers.h b/device/gamepad/gamepad_test_helpers.h
index b4f8c93..87857c2 100644
--- a/device/gamepad/gamepad_test_helpers.h
+++ b/device/gamepad/gamepad_test_helpers.h
@@ -14,7 +14,7 @@
 #include "device/gamepad/gamepad_data_fetcher.h"
 #include "device/gamepad/gamepad_service.h"
 #include "device/gamepad/gamepad_shared_buffer.h"
-#include "third_party/WebKit/public/platform/WebGamepads.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 
 namespace device {
 
@@ -23,7 +23,7 @@
  public:
   // Initializes the fetcher with the given gamepad data, which will be
   // returned when the provider queries us.
-  explicit MockGamepadDataFetcher(const blink::WebGamepads& test_data);
+  explicit MockGamepadDataFetcher(const Gamepads& test_data);
 
   ~MockGamepadDataFetcher() override;
 
@@ -42,11 +42,11 @@
   void WaitForDataReadAndCallbacksIssued();
 
   // Updates the test data.
-  void SetTestData(const blink::WebGamepads& new_data);
+  void SetTestData(const Gamepads& new_data);
 
  private:
   base::Lock lock_;
-  blink::WebGamepads test_data_;
+  Gamepads test_data_;
   base::WaitableEvent read_data_;
 
   DISALLOW_COPY_AND_ASSIGN(MockGamepadDataFetcher);
@@ -71,7 +71,7 @@
 // global singleton for the gamepad service.
 class GamepadServiceTestConstructor : public GamepadTestHelper {
  public:
-  explicit GamepadServiceTestConstructor(const blink::WebGamepads& test_data);
+  explicit GamepadServiceTestConstructor(const Gamepads& test_data);
   ~GamepadServiceTestConstructor() override;
 
   GamepadService* gamepad_service() { return gamepad_service_; }
diff --git a/device/gamepad/gamepad_user_gesture.cc b/device/gamepad/gamepad_user_gesture.cc
index 3307bbd..b4da5e0 100644
--- a/device/gamepad/gamepad_user_gesture.cc
+++ b/device/gamepad/gamepad_user_gesture.cc
@@ -8,7 +8,7 @@
 
 #include <algorithm>
 
-#include "third_party/WebKit/public/platform/WebGamepads.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 
 namespace {
 // A big enough deadzone to detect accidental presses.
@@ -17,9 +17,9 @@
 
 namespace device {
 
-bool GamepadsHaveUserGesture(const blink::WebGamepads& gamepads) {
-  for (unsigned int i = 0; i < blink::WebGamepads::kItemsLengthCap; i++) {
-    const blink::WebGamepad& pad = gamepads.items[i];
+bool GamepadsHaveUserGesture(const Gamepads& gamepads) {
+  for (unsigned int i = 0; i < Gamepads::kItemsLengthCap; i++) {
+    const Gamepad& pad = gamepads.items[i];
 
     // If the device is physically connected, then check the buttons and axes
     // to see if there is currently an intentional user action.
diff --git a/device/gamepad/gamepad_user_gesture.h b/device/gamepad/gamepad_user_gesture.h
index d88601f..fa7e73c 100644
--- a/device/gamepad/gamepad_user_gesture.h
+++ b/device/gamepad/gamepad_user_gesture.h
@@ -5,15 +5,13 @@
 #ifndef DEVICE_GAMEPAD_USER_GESTURE_H_
 #define DEVICE_GAMEPAD_USER_GESTURE_H_
 
-namespace blink {
-class WebGamepads;
-}
-
 namespace device {
 
+class Gamepads;
+
 // Returns true if any of the gamepads have a button pressed or axis moved
 // that would be considered a user gesture for interaction.
-bool GamepadsHaveUserGesture(const blink::WebGamepads& gamepads);
+bool GamepadsHaveUserGesture(const Gamepads& gamepads);
 
 }  // namespace device
 
diff --git a/device/gamepad/public/cpp/BUILD.gn b/device/gamepad/public/cpp/BUILD.gn
new file mode 100644
index 0000000..fdec85b
--- /dev/null
+++ b/device/gamepad/public/cpp/BUILD.gn
@@ -0,0 +1,23 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This target contains only those files that are shared by the Device Gamepad
+# implementation and all Device Gamepad clients, including Blink. Add a file
+# here only if it meets the following constraints:
+# (1) It is *necessary* to use the file to consume Device Gamepad (the
+# current files define structs that are used as a consistent interpretation of
+# shared memory by the Device Gamepad and its clients).
+# (2) The file has no dependencies on the STL or Chromium code and will not
+# grow them over time (the current files are POD structs and will necessarily
+# stay that way due to their above-described purpose).
+# Consult {platform-architecture-dev, services-dev}@chromium.org in the case
+# of any uncertainty.
+source_set("shared_with_blink") {
+  sources = [
+    "gamepad.cc",
+    "gamepad.h",
+    "gamepads.h",
+  ]
+  # Do not add deps here per the above comment.
+}
diff --git a/device/gamepad/public/cpp/gamepad.cc b/device/gamepad/public/cpp/gamepad.cc
new file mode 100644
index 0000000..bd5bf4ed
--- /dev/null
+++ b/device/gamepad/public/cpp/gamepad.cc
@@ -0,0 +1,21 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "device/gamepad/public/cpp/gamepad.h"
+
+namespace device {
+
+Gamepad::Gamepad()
+    : connected(false),
+      timestamp(0),
+      axes_length(0),
+      buttons_length(0),
+      display_id(0) {
+  id[0] = 0;
+  mapping[0] = 0;
+}
+
+Gamepad::Gamepad(const Gamepad& other) = default;
+
+}  // namespace device
diff --git a/device/gamepad/public/cpp/gamepad.h b/device/gamepad/public/cpp/gamepad.h
new file mode 100644
index 0000000..c8a7e8bd
--- /dev/null
+++ b/device/gamepad/public/cpp/gamepad.h
@@ -0,0 +1,115 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef DEVICE_GAMEPAD_PUBLIC_CPP_GAMEPAD_H_
+#define DEVICE_GAMEPAD_PUBLIC_CPP_GAMEPAD_H_
+
+#include <stddef.h>
+
+namespace device {
+
+#pragma pack(push, 4)
+
+class GamepadButton {
+ public:
+  GamepadButton() : pressed(false), touched(false), value(0.) {}
+  GamepadButton(bool pressed, bool touched, double value)
+      : pressed(pressed), touched(touched), value(value) {}
+  bool pressed;
+  bool touched;
+  double value;
+};
+
+class GamepadVector {
+ public:
+  GamepadVector() : not_null(false) {}
+
+  bool not_null;
+  float x, y, z;
+};
+
+class GamepadQuaternion {
+ public:
+  GamepadQuaternion() : not_null(false) {}
+
+  bool not_null;
+  float x, y, z, w;
+};
+
+class GamepadPose {
+ public:
+  GamepadPose() : not_null(false) {}
+
+  bool not_null;
+
+  bool has_orientation;
+  bool has_position;
+
+  GamepadQuaternion orientation;
+  GamepadVector position;
+  GamepadVector angular_velocity;
+  GamepadVector linear_velocity;
+  GamepadVector angular_acceleration;
+  GamepadVector linear_acceleration;
+};
+
+enum class GamepadHand { kNone = 0, kLeft = 1, kRight = 2 };
+
+// UTF-16 character type
+#if defined(WIN32)
+using UChar = wchar_t;
+#else
+using UChar = unsigned short;
+#endif
+
+// This structure is intentionally POD and fixed size so that it can be shared
+// memory between hardware polling threads and the rest of the browser. See
+// also gamepads.h.
+class Gamepad {
+ public:
+  static constexpr size_t kIdLengthCap = 128;
+  static constexpr size_t kMappingLengthCap = 16;
+  static constexpr size_t kAxesLengthCap = 16;
+  static constexpr size_t kButtonsLengthCap = 32;
+
+  Gamepad();
+  Gamepad(const Gamepad& other);
+
+  // Is there a gamepad connected at this index?
+  bool connected;
+
+  // Device identifier (based on manufacturer, model, etc.).
+  UChar id[kIdLengthCap];
+
+  // Monotonically increasing value referring to when the data were last
+  // updated.
+  unsigned long long timestamp;
+
+  // Number of valid entries in the axes array.
+  unsigned axes_length;
+
+  // Normalized values representing axes, in the range [-1..1].
+  double axes[kAxesLengthCap];
+
+  // Number of valid entries in the buttons array.
+  unsigned buttons_length;
+
+  // Button states
+  GamepadButton buttons[kButtonsLengthCap];
+
+  // Mapping type (for example "standard")
+  UChar mapping[kMappingLengthCap];
+
+  GamepadPose pose;
+
+  GamepadHand hand;
+
+  unsigned display_id;
+};
+
+#pragma pack(pop)
+
+}  // namespace device
+
+#endif  // DEVICE_GAMEPAD_PUBLIC_CPP_GAMEPAD_H_
diff --git a/device/gamepad/public/cpp/gamepads.h b/device/gamepad/public/cpp/gamepads.h
new file mode 100644
index 0000000..e5ebebf
--- /dev/null
+++ b/device/gamepad/public/cpp/gamepads.h
@@ -0,0 +1,29 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef DEVICE_GAMEPAD_PUBLIC_CPP_GAMEPADS_H_
+#define DEVICE_GAMEPAD_PUBLIC_CPP_GAMEPADS_H_
+
+#include "device/gamepad/public/cpp/gamepad.h"
+
+namespace device {
+
+#pragma pack(push, 4)
+
+// This structure is intentionally POD and fixed size so that it can be stored
+// in shared memory between hardware polling threads and the rest of the
+// browser.
+class Gamepads {
+ public:
+  static constexpr size_t kItemsLengthCap = 4;
+
+  // Gamepad data for N separate gamepad devices.
+  Gamepad items[kItemsLengthCap];
+};
+
+#pragma pack(pop)
+
+}  // namespace device
+
+#endif  // DEVICE_GAMEPAD_PUBLIC_CPP_GAMEPADS_H_
diff --git a/device/gamepad/public/interfaces/OWNERS b/device/gamepad/public/interfaces/OWNERS
index a4ead6e..51ec2e6 100644
--- a/device/gamepad/public/interfaces/OWNERS
+++ b/device/gamepad/public/interfaces/OWNERS
@@ -4,3 +4,5 @@
 per-file *.mojom=file://ipc/SECURITY_OWNERS
 per-file *_struct_traits*.*=set noparent
 per-file *_struct_traits*.*=file://ipc/SECURITY_OWNERS
+per-file *.typemap=set noparent
+per-file *.typemap=file://ipc/SECURITY_OWNERS
diff --git a/device/gamepad/public/interfaces/gamepad.typemap b/device/gamepad/public/interfaces/gamepad.typemap
index 531b5d00..81850d6 100644
--- a/device/gamepad/public/interfaces/gamepad.typemap
+++ b/device/gamepad/public/interfaces/gamepad.typemap
@@ -3,7 +3,7 @@
 # found in the LICENSE file.
 
 mojom = "//device/gamepad/public/interfaces/gamepad.mojom"
-public_headers = [ "//third_party/WebKit/public/platform/WebGamepad.h" ]
+public_headers = [ "//device/gamepad/public/cpp/gamepad.h" ]
 traits_headers =
     [ "//device/gamepad/public/interfaces/gamepad_struct_traits.h" ]
 sources = [
@@ -15,10 +15,10 @@
 ]
 
 type_mappings = [
-  "device.mojom.Gamepad=blink::WebGamepad",
-  "device.mojom.GamepadButton=blink::WebGamepadButton",
-  "device.mojom.GamepadHand=blink::WebGamepadHand",
-  "device.mojom.GamepadPose=blink::WebGamepadPose[nullable_is_same_type]",
-  "device.mojom.GamepadQuaternion=blink::WebGamepadQuaternion[nullable_is_same_type]",
-  "device.mojom.GamepadVector=blink::WebGamepadVector[nullable_is_same_type]",
+  "device.mojom.Gamepad=device::Gamepad",
+  "device.mojom.GamepadButton=device::GamepadButton",
+  "device.mojom.GamepadHand=device::GamepadHand",
+  "device.mojom.GamepadPose=device::GamepadPose[nullable_is_same_type]",
+  "device.mojom.GamepadQuaternion=device::GamepadQuaternion[nullable_is_same_type]",
+  "device.mojom.GamepadVector=device::GamepadVector[nullable_is_same_type]",
 ]
diff --git a/device/gamepad/public/interfaces/gamepad_struct_traits.cc b/device/gamepad/public/interfaces/gamepad_struct_traits.cc
index 3d02a27..2a97cea 100644
--- a/device/gamepad/public/interfaces/gamepad_struct_traits.cc
+++ b/device/gamepad/public/interfaces/gamepad_struct_traits.cc
@@ -9,16 +9,16 @@
 // static
 void StructTraits<
     device::mojom::GamepadQuaternionDataView,
-    blink::WebGamepadQuaternion>::SetToNull(blink::WebGamepadQuaternion* out) {
-  memset(out, 0, sizeof(blink::WebGamepadQuaternion));
+    device::GamepadQuaternion>::SetToNull(device::GamepadQuaternion* out) {
+  memset(out, 0, sizeof(device::GamepadQuaternion));
   out->not_null = false;
 }
 
 // static
 bool StructTraits<device::mojom::GamepadQuaternionDataView,
-                  blink::WebGamepadQuaternion>::
+                  device::GamepadQuaternion>::
     Read(device::mojom::GamepadQuaternionDataView data,
-         blink::WebGamepadQuaternion* out) {
+         device::GamepadQuaternion* out) {
   out->not_null = true;
   out->x = data.x();
   out->y = data.y();
@@ -29,17 +29,16 @@
 
 // static
 void StructTraits<device::mojom::GamepadVectorDataView,
-                  blink::WebGamepadVector>::SetToNull(blink::WebGamepadVector*
-                                                          out) {
-  memset(out, 0, sizeof(blink::WebGamepadVector));
+                  device::GamepadVector>::SetToNull(device::GamepadVector*
+                                                        out) {
+  memset(out, 0, sizeof(device::GamepadVector));
   out->not_null = false;
 }
 
 // static
-bool StructTraits<
-    device::mojom::GamepadVectorDataView,
-    blink::WebGamepadVector>::Read(device::mojom::GamepadVectorDataView data,
-                                   blink::WebGamepadVector* out) {
+bool StructTraits<device::mojom::GamepadVectorDataView, device::GamepadVector>::
+    Read(device::mojom::GamepadVectorDataView data,
+         device::GamepadVector* out) {
   out->not_null = true;
   out->x = data.x();
   out->y = data.y();
@@ -48,10 +47,9 @@
 }
 
 // static
-bool StructTraits<
-    device::mojom::GamepadButtonDataView,
-    blink::WebGamepadButton>::Read(device::mojom::GamepadButtonDataView data,
-                                   blink::WebGamepadButton* out) {
+bool StructTraits<device::mojom::GamepadButtonDataView, device::GamepadButton>::
+    Read(device::mojom::GamepadButtonDataView data,
+         device::GamepadButton* out) {
   out->pressed = data.pressed();
   out->touched = data.touched();
   out->value = data.value();
@@ -60,15 +58,14 @@
 
 // static
 void StructTraits<device::mojom::GamepadPoseDataView,
-                  blink::WebGamepadPose>::SetToNull(blink::WebGamepadPose*
-                                                        out) {
-  memset(out, 0, sizeof(blink::WebGamepadPose));
+                  device::GamepadPose>::SetToNull(device::GamepadPose* out) {
+  memset(out, 0, sizeof(device::GamepadPose));
   out->not_null = false;
 }
 
 // static
-bool StructTraits<device::mojom::GamepadPoseDataView, blink::WebGamepadPose>::
-    Read(device::mojom::GamepadPoseDataView data, blink::WebGamepadPose* out) {
+bool StructTraits<device::mojom::GamepadPoseDataView, device::GamepadPose>::
+    Read(device::mojom::GamepadPoseDataView data, device::GamepadPose* out) {
   out->not_null = true;
   if (!data.ReadOrientation(&out->orientation)) {
     return false;
@@ -97,14 +94,14 @@
 
 // static
 device::mojom::GamepadHand
-EnumTraits<device::mojom::GamepadHand, blink::WebGamepadHand>::ToMojom(
-    blink::WebGamepadHand input) {
+EnumTraits<device::mojom::GamepadHand, device::GamepadHand>::ToMojom(
+    device::GamepadHand input) {
   switch (input) {
-    case blink::WebGamepadHand::kGamepadHandNone:
+    case device::GamepadHand::kNone:
       return device::mojom::GamepadHand::GamepadHandNone;
-    case blink::WebGamepadHand::kGamepadHandLeft:
+    case device::GamepadHand::kLeft:
       return device::mojom::GamepadHand::GamepadHandLeft;
-    case blink::WebGamepadHand::kGamepadHandRight:
+    case device::GamepadHand::kRight:
       return device::mojom::GamepadHand::GamepadHandRight;
   }
 
@@ -113,18 +110,18 @@
 }
 
 // static
-bool EnumTraits<device::mojom::GamepadHand, blink::WebGamepadHand>::FromMojom(
+bool EnumTraits<device::mojom::GamepadHand, device::GamepadHand>::FromMojom(
     device::mojom::GamepadHand input,
-    blink::WebGamepadHand* output) {
+    device::GamepadHand* output) {
   switch (input) {
     case device::mojom::GamepadHand::GamepadHandNone:
-      *output = blink::WebGamepadHand::kGamepadHandNone;
+      *output = device::GamepadHand::kNone;
       return true;
     case device::mojom::GamepadHand::GamepadHandLeft:
-      *output = blink::WebGamepadHand::kGamepadHandLeft;
+      *output = device::GamepadHand::kLeft;
       return true;
     case device::mojom::GamepadHand::GamepadHandRight:
-      *output = blink::WebGamepadHand::kGamepadHandRight;
+      *output = device::GamepadHand::kRight;
       return true;
   }
 
@@ -134,10 +131,10 @@
 
 // static
 ConstCArray<uint16_t>
-StructTraits<device::mojom::GamepadDataView, blink::WebGamepad>::id(
-    const blink::WebGamepad& r) {
+StructTraits<device::mojom::GamepadDataView, device::Gamepad>::id(
+    const device::Gamepad& r) {
   size_t id_length = 0;
-  while (id_length < blink::WebGamepad::kIdLengthCap && r.id[id_length] != 0) {
+  while (id_length < device::Gamepad::kIdLengthCap && r.id[id_length] != 0) {
     id_length++;
   }
   return {id_length, reinterpret_cast<const uint16_t*>(&r.id[0])};
@@ -145,10 +142,10 @@
 
 // static
 ConstCArray<uint16_t>
-StructTraits<device::mojom::GamepadDataView, blink::WebGamepad>::mapping(
-    const blink::WebGamepad& r) {
+StructTraits<device::mojom::GamepadDataView, device::Gamepad>::mapping(
+    const device::Gamepad& r) {
   size_t mapping_length = 0;
-  while (mapping_length < blink::WebGamepad::kMappingLengthCap &&
+  while (mapping_length < device::Gamepad::kMappingLengthCap &&
          r.mapping[mapping_length] != 0) {
     mapping_length++;
   }
@@ -156,14 +153,13 @@
 }
 
 // static
-bool StructTraits<device::mojom::GamepadDataView, blink::WebGamepad>::Read(
+bool StructTraits<device::mojom::GamepadDataView, device::Gamepad>::Read(
     device::mojom::GamepadDataView data,
-    blink::WebGamepad* out) {
+    device::Gamepad* out) {
   out->connected = data.connected();
 
-  memset(&out->id[0], 0,
-         blink::WebGamepad::kIdLengthCap * sizeof(blink::WebUChar));
-  CArray<uint16_t> id = {0, blink::WebGamepad::kIdLengthCap,
+  memset(&out->id[0], 0, device::Gamepad::kIdLengthCap * sizeof(device::UChar));
+  CArray<uint16_t> id = {0, device::Gamepad::kIdLengthCap,
                          reinterpret_cast<uint16_t*>(&out->id[0])};
   if (!data.ReadId(&id)) {
     return false;
@@ -171,15 +167,15 @@
 
   out->timestamp = data.timestamp();
 
-  CArray<double> axes = {0, blink::WebGamepad::kAxesLengthCap, &out->axes[0]};
+  CArray<double> axes = {0, device::Gamepad::kAxesLengthCap, &out->axes[0]};
   if (!data.ReadAxes(&axes)) {
     return false;
   }
   // static_cast is safe when "data.ReadAxes(&axes)" above returns true.
   out->axes_length = static_cast<unsigned>(axes.size);
 
-  CArray<blink::WebGamepadButton> buttons = {
-      0, blink::WebGamepad::kButtonsLengthCap, &out->buttons[0]};
+  CArray<device::GamepadButton> buttons = {
+      0, device::Gamepad::kButtonsLengthCap, &out->buttons[0]};
   if (!data.ReadButtons(&buttons)) {
     return false;
   }
@@ -187,8 +183,8 @@
   out->buttons_length = static_cast<unsigned>(buttons.size);
 
   memset(&out->mapping[0], 0,
-         blink::WebGamepad::kMappingLengthCap * sizeof(blink::WebUChar));
-  CArray<uint16_t> mapping = {0, blink::WebGamepad::kMappingLengthCap,
+         device::Gamepad::kMappingLengthCap * sizeof(device::UChar));
+  CArray<uint16_t> mapping = {0, device::Gamepad::kMappingLengthCap,
                               reinterpret_cast<uint16_t*>(&out->mapping[0])};
   if (!data.ReadMapping(&mapping)) {
     return false;
@@ -198,7 +194,7 @@
     return false;
   }
 
-  blink::WebGamepadHand hand;
+  device::GamepadHand hand;
   if (!data.ReadHand(&hand)) {
     return false;
   }
diff --git a/device/gamepad/public/interfaces/gamepad_struct_traits.h b/device/gamepad/public/interfaces/gamepad_struct_traits.h
index b0a334e..9d02f52 100644
--- a/device/gamepad/public/interfaces/gamepad_struct_traits.h
+++ b/device/gamepad/public/interfaces/gamepad_struct_traits.h
@@ -7,113 +7,107 @@
 
 #include <stddef.h>
 
+#include "device/gamepad/public/cpp/gamepad.h"
 #include "device/gamepad/public/interfaces/gamepad.mojom.h"
 #include "mojo/public/cpp/bindings/array_traits_carray.h"
 #include "mojo/public/cpp/bindings/struct_traits.h"
-#include "third_party/WebKit/public/platform/WebGamepad.h"
 
 namespace mojo {
 
 template <>
 struct StructTraits<device::mojom::GamepadQuaternionDataView,
-                    blink::WebGamepadQuaternion> {
-  static bool IsNull(const blink::WebGamepadQuaternion& r) {
-    return !r.not_null;
-  }
-  static void SetToNull(blink::WebGamepadQuaternion* out);
-  static float x(const blink::WebGamepadQuaternion& r) { return r.x; }
-  static float y(const blink::WebGamepadQuaternion& r) { return r.y; }
-  static float z(const blink::WebGamepadQuaternion& r) { return r.z; }
-  static float w(const blink::WebGamepadQuaternion& r) { return r.w; }
+                    device::GamepadQuaternion> {
+  static bool IsNull(const device::GamepadQuaternion& r) { return !r.not_null; }
+  static void SetToNull(device::GamepadQuaternion* out);
+  static float x(const device::GamepadQuaternion& r) { return r.x; }
+  static float y(const device::GamepadQuaternion& r) { return r.y; }
+  static float z(const device::GamepadQuaternion& r) { return r.z; }
+  static float w(const device::GamepadQuaternion& r) { return r.w; }
   static bool Read(device::mojom::GamepadQuaternionDataView data,
-                   blink::WebGamepadQuaternion* out);
+                   device::GamepadQuaternion* out);
 };
 
 template <>
 struct StructTraits<device::mojom::GamepadVectorDataView,
-                    blink::WebGamepadVector> {
-  static bool IsNull(const blink::WebGamepadVector& r) { return !r.not_null; }
-  static void SetToNull(blink::WebGamepadVector* out);
-  static float x(const blink::WebGamepadVector& r) { return r.x; }
-  static float y(const blink::WebGamepadVector& r) { return r.y; }
-  static float z(const blink::WebGamepadVector& r) { return r.z; }
+                    device::GamepadVector> {
+  static bool IsNull(const device::GamepadVector& r) { return !r.not_null; }
+  static void SetToNull(device::GamepadVector* out);
+  static float x(const device::GamepadVector& r) { return r.x; }
+  static float y(const device::GamepadVector& r) { return r.y; }
+  static float z(const device::GamepadVector& r) { return r.z; }
   static bool Read(device::mojom::GamepadVectorDataView data,
-                   blink::WebGamepadVector* out);
+                   device::GamepadVector* out);
 };
 
 template <>
 struct StructTraits<device::mojom::GamepadButtonDataView,
-                    blink::WebGamepadButton> {
-  static bool pressed(const blink::WebGamepadButton& r) { return r.pressed; }
-  static bool touched(const blink::WebGamepadButton& r) { return r.touched; }
-  static double value(const blink::WebGamepadButton& r) { return r.value; }
+                    device::GamepadButton> {
+  static bool pressed(const device::GamepadButton& r) { return r.pressed; }
+  static bool touched(const device::GamepadButton& r) { return r.touched; }
+  static double value(const device::GamepadButton& r) { return r.value; }
   static bool Read(device::mojom::GamepadButtonDataView data,
-                   blink::WebGamepadButton* out);
+                   device::GamepadButton* out);
 };
 
 template <>
-struct StructTraits<device::mojom::GamepadPoseDataView, blink::WebGamepadPose> {
-  static bool IsNull(const blink::WebGamepadPose& r) { return !r.not_null; }
-  static void SetToNull(blink::WebGamepadPose* out);
-  static const blink::WebGamepadQuaternion& orientation(
-      const blink::WebGamepadPose& r) {
+struct StructTraits<device::mojom::GamepadPoseDataView, device::GamepadPose> {
+  static bool IsNull(const device::GamepadPose& r) { return !r.not_null; }
+  static void SetToNull(device::GamepadPose* out);
+  static const device::GamepadQuaternion& orientation(
+      const device::GamepadPose& r) {
     return r.orientation;
   }
-  static const blink::WebGamepadVector& position(
-      const blink::WebGamepadPose& r) {
+  static const device::GamepadVector& position(const device::GamepadPose& r) {
     return r.position;
   }
-  static const blink::WebGamepadVector& angular_velocity(
-      const blink::WebGamepadPose& r) {
+  static const device::GamepadVector& angular_velocity(
+      const device::GamepadPose& r) {
     return r.angular_velocity;
   }
-  static const blink::WebGamepadVector& linear_velocity(
-      const blink::WebGamepadPose& r) {
+  static const device::GamepadVector& linear_velocity(
+      const device::GamepadPose& r) {
     return r.linear_velocity;
   }
-  static const blink::WebGamepadVector& angular_acceleration(
-      const blink::WebGamepadPose& r) {
+  static const device::GamepadVector& angular_acceleration(
+      const device::GamepadPose& r) {
     return r.angular_acceleration;
   }
-  static const blink::WebGamepadVector& linear_acceleration(
-      const blink::WebGamepadPose& r) {
+  static const device::GamepadVector& linear_acceleration(
+      const device::GamepadPose& r) {
     return r.linear_acceleration;
   }
   static bool Read(device::mojom::GamepadPoseDataView data,
-                   blink::WebGamepadPose* out);
+                   device::GamepadPose* out);
 };
 
 template <>
-struct EnumTraits<device::mojom::GamepadHand, blink::WebGamepadHand> {
-  static device::mojom::GamepadHand ToMojom(blink::WebGamepadHand input);
+struct EnumTraits<device::mojom::GamepadHand, device::GamepadHand> {
+  static device::mojom::GamepadHand ToMojom(device::GamepadHand input);
   static bool FromMojom(device::mojom::GamepadHand input,
-                        blink::WebGamepadHand* output);
+                        device::GamepadHand* output);
 };
 
 template <>
-struct StructTraits<device::mojom::GamepadDataView, blink::WebGamepad> {
-  static bool connected(const blink::WebGamepad& r) { return r.connected; }
-  static uint64_t timestamp(const blink::WebGamepad& r) { return r.timestamp; }
-  static ConstCArray<double> axes(const blink::WebGamepad& r) {
+struct StructTraits<device::mojom::GamepadDataView, device::Gamepad> {
+  static bool connected(const device::Gamepad& r) { return r.connected; }
+  static uint64_t timestamp(const device::Gamepad& r) { return r.timestamp; }
+  static ConstCArray<double> axes(const device::Gamepad& r) {
     return {r.axes_length, &r.axes[0]};
   }
-  static ConstCArray<blink::WebGamepadButton> buttons(
-      const blink::WebGamepad& r) {
+  static ConstCArray<device::GamepadButton> buttons(const device::Gamepad& r) {
     return {r.buttons_length, &r.buttons[0]};
   }
-  static const blink::WebGamepadPose& pose(const blink::WebGamepad& r) {
+  static const device::GamepadPose& pose(const device::Gamepad& r) {
     return r.pose;
   }
-  static const blink::WebGamepadHand& hand(const blink::WebGamepad& r) {
+  static const device::GamepadHand& hand(const device::Gamepad& r) {
     return r.hand;
   }
-  static uint32_t display_id(const blink::WebGamepad& r) {
-    return r.display_id;
-  }
+  static uint32_t display_id(const device::Gamepad& r) { return r.display_id; }
 
-  static ConstCArray<uint16_t> id(const blink::WebGamepad& r);
-  static ConstCArray<uint16_t> mapping(const blink::WebGamepad& r);
-  static bool Read(device::mojom::GamepadDataView data, blink::WebGamepad* out);
+  static ConstCArray<uint16_t> id(const device::Gamepad& r);
+  static ConstCArray<uint16_t> mapping(const device::Gamepad& r);
+  static bool Read(device::mojom::GamepadDataView data, device::Gamepad* out);
 };
 
 }  // namespace mojo
diff --git a/device/gamepad/public/interfaces/gamepad_struct_traits_unittest.cc b/device/gamepad/public/interfaces/gamepad_struct_traits_unittest.cc
index e3b59f1..f1c5c27c 100644
--- a/device/gamepad/public/interfaces/gamepad_struct_traits_unittest.cc
+++ b/device/gamepad/public/interfaces/gamepad_struct_traits_unittest.cc
@@ -4,11 +4,11 @@
 
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
+#include "device/gamepad/public/cpp/gamepad.h"
 #include "device/gamepad/public/interfaces/gamepad_struct_traits_test.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
 #include "testing/gtest/include/gtest/gtest.h"
-#include "third_party/WebKit/public/platform/WebGamepad.h"
 
 namespace device {
 
@@ -21,21 +21,21 @@
   GamepadPose_Null = 3,
 };
 
-blink::WebGamepad GetWebGamepadInstance(GamepadTestDataType type) {
-  blink::WebGamepadButton wgb(true, false, 1.0f);
+Gamepad GetWebGamepadInstance(GamepadTestDataType type) {
+  GamepadButton wgb(true, false, 1.0f);
 
-  blink::WebGamepadVector wgv;
-  memset(&wgv, 0, sizeof(blink::WebGamepadVector));
+  GamepadVector wgv;
+  memset(&wgv, 0, sizeof(GamepadVector));
   wgv.not_null = true;
   wgv.x = wgv.y = wgv.z = 1.0f;
 
-  blink::WebGamepadQuaternion wgq;
-  memset(&wgq, 0, sizeof(blink::WebGamepadQuaternion));
+  GamepadQuaternion wgq;
+  memset(&wgq, 0, sizeof(GamepadQuaternion));
   wgq.not_null = true;
   wgq.x = wgq.y = wgq.z = wgq.w = 2.0f;
 
-  blink::WebGamepadPose wgp;
-  memset(&wgp, 0, sizeof(blink::WebGamepadPose));
+  GamepadPose wgp;
+  memset(&wgp, 0, sizeof(GamepadPose));
   if (type == GamepadPose_Null) {
     wgp.not_null = false;
   } else if (type == GamepadCommon) {
@@ -55,57 +55,56 @@
     wgp.angular_acceleration = wgv;
   }
 
-  blink::WebUChar wch[blink::WebGamepad::kMappingLengthCap] = {
+  UChar wch[Gamepad::kMappingLengthCap] = {
       1,    8,    9,     127,   128,   1024,  1025,  1949,
       2047, 2048, 16383, 16384, 20000, 32767, 32768, 65535};
 
-  blink::WebGamepad send;
-  memset(&send, 0, sizeof(blink::WebGamepad));
+  Gamepad send;
+  memset(&send, 0, sizeof(Gamepad));
 
   send.connected = true;
-  for (size_t i = 0; i < blink::WebGamepad::kMappingLengthCap; i++) {
+  for (size_t i = 0; i < Gamepad::kMappingLengthCap; i++) {
     send.id[i] = send.mapping[i] = wch[i];
   }
   send.timestamp = 1234567890123456789ULL;
   send.axes_length = 0U;
-  for (size_t i = 0; i < blink::WebGamepad::kAxesLengthCap; i++) {
+  for (size_t i = 0; i < Gamepad::kAxesLengthCap; i++) {
     send.axes_length++;
     send.axes[i] = 1.0;
   }
   send.buttons_length = 0U;
-  for (size_t i = 0; i < blink::WebGamepad::kButtonsLengthCap; i++) {
+  for (size_t i = 0; i < Gamepad::kButtonsLengthCap; i++) {
     send.buttons_length++;
     send.buttons[i] = wgb;
   }
   send.pose = wgp;
-  send.hand = blink::WebGamepadHand::kGamepadHandRight;
+  send.hand = GamepadHand::kRight;
   send.display_id = static_cast<unsigned short>(16);
 
   return send;
 }
 
-bool isWebGamepadButtonEqual(const blink::WebGamepadButton& lhs,
-                             const blink::WebGamepadButton& rhs) {
+bool isWebGamepadButtonEqual(const GamepadButton& lhs,
+                             const GamepadButton& rhs) {
   return (lhs.pressed == rhs.pressed && lhs.touched == rhs.touched &&
           lhs.value == rhs.value);
 }
 
-bool isWebGamepadVectorEqual(const blink::WebGamepadVector& lhs,
-                             const blink::WebGamepadVector& rhs) {
+bool isWebGamepadVectorEqual(const GamepadVector& lhs,
+                             const GamepadVector& rhs) {
   return ((lhs.not_null == false && rhs.not_null == false) ||
           (lhs.not_null == rhs.not_null && lhs.x == rhs.x && lhs.y == rhs.y &&
            lhs.z == rhs.z));
 }
 
-bool isWebGamepadQuaternionEqual(const blink::WebGamepadQuaternion& lhs,
-                                 const blink::WebGamepadQuaternion& rhs) {
+bool isWebGamepadQuaternionEqual(const GamepadQuaternion& lhs,
+                                 const GamepadQuaternion& rhs) {
   return ((lhs.not_null == false && rhs.not_null == false) ||
           (lhs.not_null == rhs.not_null && lhs.x == rhs.x && lhs.y == rhs.y &&
            lhs.z == rhs.z && lhs.w == rhs.w));
 }
 
-bool isWebGamepadPoseEqual(const blink::WebGamepadPose& lhs,
-                           const blink::WebGamepadPose& rhs) {
+bool isWebGamepadPoseEqual(const GamepadPose& lhs, const GamepadPose& rhs) {
   if (lhs.not_null == false && rhs.not_null == false) {
     return true;
   }
@@ -131,8 +130,7 @@
   return true;
 }
 
-bool isWebGamepadEqual(const blink::WebGamepad& send,
-                       const blink::WebGamepad& echo) {
+bool isWebGamepadEqual(const Gamepad& send, const Gamepad& echo) {
   if (send.connected != echo.connected || send.timestamp != echo.timestamp ||
       send.axes_length != echo.axes_length ||
       send.buttons_length != echo.buttons_length ||
@@ -140,22 +138,22 @@
       send.display_id != echo.display_id) {
     return false;
   }
-  for (size_t i = 0; i < blink::WebGamepad::kIdLengthCap; i++) {
+  for (size_t i = 0; i < Gamepad::kIdLengthCap; i++) {
     if (send.id[i] != echo.id[i]) {
       return false;
     }
   }
-  for (size_t i = 0; i < blink::WebGamepad::kAxesLengthCap; i++) {
+  for (size_t i = 0; i < Gamepad::kAxesLengthCap; i++) {
     if (send.axes[i] != echo.axes[i]) {
       return false;
     }
   }
-  for (size_t i = 0; i < blink::WebGamepad::kButtonsLengthCap; i++) {
+  for (size_t i = 0; i < Gamepad::kButtonsLengthCap; i++) {
     if (!isWebGamepadButtonEqual(send.buttons[i], echo.buttons[i])) {
       return false;
     }
   }
-  for (size_t i = 0; i < blink::WebGamepad::kMappingLengthCap; i++) {
+  for (size_t i = 0; i < Gamepad::kMappingLengthCap; i++) {
     if (send.mapping[i] != echo.mapping[i]) {
       return false;
     }
@@ -163,9 +161,9 @@
   return true;
 }
 
-void ExpectWebGamepad(const blink::WebGamepad& send,
+void ExpectWebGamepad(const Gamepad& send,
                       const base::Closure& closure,
-                      const blink::WebGamepad& echo) {
+                      const Gamepad& echo) {
   EXPECT_EQ(true, isWebGamepadEqual(send, echo));
   closure.Run();
 }
@@ -173,61 +171,57 @@
 }  // namespace
 
 class GamepadStructTraitsTest : public testing::Test,
-                                public device::mojom::GamepadStructTraitsTest {
+                                public mojom::GamepadStructTraitsTest {
  protected:
   GamepadStructTraitsTest() : binding_(this) {}
 
-  void PassGamepad(const blink::WebGamepad& send,
+  void PassGamepad(const Gamepad& send,
                    const PassGamepadCallback& callback) override {
     callback.Run(send);
   }
 
-  device::mojom::GamepadStructTraitsTestPtr GetGamepadStructTraitsTestProxy() {
+  mojom::GamepadStructTraitsTestPtr GetGamepadStructTraitsTestProxy() {
     return binding_.CreateInterfacePtrAndBind();
   }
 
  private:
   base::MessageLoop message_loop_;
-  mojo::Binding<device::mojom::GamepadStructTraitsTest> binding_;
+  mojo::Binding<mojom::GamepadStructTraitsTest> binding_;
 
   DISALLOW_COPY_AND_ASSIGN(GamepadStructTraitsTest);
 };
 
 TEST_F(GamepadStructTraitsTest, GamepadCommon) {
-  blink::WebGamepad send = GetWebGamepadInstance(GamepadCommon);
+  Gamepad send = GetWebGamepadInstance(GamepadCommon);
   base::RunLoop loop;
-  device::mojom::GamepadStructTraitsTestPtr proxy =
-      GetGamepadStructTraitsTestProxy();
+  mojom::GamepadStructTraitsTestPtr proxy = GetGamepadStructTraitsTestProxy();
   proxy->PassGamepad(send,
                      base::Bind(&ExpectWebGamepad, send, loop.QuitClosure()));
   loop.Run();
 }
 
 TEST_F(GamepadStructTraitsTest, GamepadPose_HasOrientation) {
-  blink::WebGamepad send = GetWebGamepadInstance(GamepadPose_HasOrientation);
+  Gamepad send = GetWebGamepadInstance(GamepadPose_HasOrientation);
   base::RunLoop loop;
-  device::mojom::GamepadStructTraitsTestPtr proxy =
-      GetGamepadStructTraitsTestProxy();
+  mojom::GamepadStructTraitsTestPtr proxy = GetGamepadStructTraitsTestProxy();
   proxy->PassGamepad(send,
                      base::Bind(&ExpectWebGamepad, send, loop.QuitClosure()));
   loop.Run();
 }
 
 TEST_F(GamepadStructTraitsTest, GamepadPose_HasPosition) {
-  blink::WebGamepad send = GetWebGamepadInstance(GamepadPose_HasPosition);
+  Gamepad send = GetWebGamepadInstance(GamepadPose_HasPosition);
   base::RunLoop loop;
-  device::mojom::GamepadStructTraitsTestPtr proxy =
-      GetGamepadStructTraitsTestProxy();
+  mojom::GamepadStructTraitsTestPtr proxy = GetGamepadStructTraitsTestProxy();
   proxy->PassGamepad(send,
                      base::Bind(&ExpectWebGamepad, send, loop.QuitClosure()));
   loop.Run();
 }
 
 TEST_F(GamepadStructTraitsTest, GamepadPose_Null) {
-  blink::WebGamepad send = GetWebGamepadInstance(GamepadPose_Null);
+  Gamepad send = GetWebGamepadInstance(GamepadPose_Null);
   base::RunLoop loop;
-  device::mojom::GamepadStructTraitsTestPtr proxy =
-      GetGamepadStructTraitsTestProxy();
+  mojom::GamepadStructTraitsTestPtr proxy = GetGamepadStructTraitsTestProxy();
   proxy->PassGamepad(send,
                      base::Bind(&ExpectWebGamepad, send, loop.QuitClosure()));
   loop.Run();
diff --git a/device/gamepad/raw_input_data_fetcher_win.cc b/device/gamepad/raw_input_data_fetcher_win.cc
index 27cc164f..132e93e 100644
--- a/device/gamepad/raw_input_data_fetcher_win.cc
+++ b/device/gamepad/raw_input_data_fetcher_win.cc
@@ -12,8 +12,6 @@
 
 namespace device {
 
-using namespace blink;
-
 namespace {
 
 float NormalizeAxis(long value, long min, long max) {
@@ -160,7 +158,7 @@
     if (!state)
       continue;
 
-    WebGamepad& pad = state->data;
+    Gamepad& pad = state->data;
 
     pad.timestamp = gamepad->report_id;
     pad.buttons_length = gamepad->buttons_length;
@@ -216,7 +214,7 @@
 
         controllers_[device_handle] = gamepad;
 
-        WebGamepad& pad = state->data;
+        Gamepad& pad = state->data;
         pad.connected = true;
 
         std::string vendor = base::StringPrintf("%04x", gamepad->vendor_id);
@@ -225,13 +223,13 @@
         state->axis_mask = 0;
         state->button_mask = 0;
 
-        swprintf(pad.id, WebGamepad::kIdLengthCap,
+        swprintf(pad.id, Gamepad::kIdLengthCap,
                  L"%ls (%lsVendor: %04x Product: %04x)", gamepad->id,
                  state->mapper ? L"STANDARD GAMEPAD " : L"", gamepad->vendor_id,
                  gamepad->product_id);
 
         if (state->mapper)
-          swprintf(pad.mapping, WebGamepad::kMappingLengthCap, L"standard");
+          swprintf(pad.mapping, Gamepad::kMappingLengthCap, L"standard");
         else
           pad.mapping[0] = 0;
       }
@@ -336,7 +334,7 @@
   }
 
   if (!got_product_string)
-    swprintf(gamepad_info->id, WebGamepad::kIdLengthCap, L"Unknown Gamepad");
+    swprintf(gamepad_info->id, Gamepad::kIdLengthCap, L"Unknown Gamepad");
 
   // Query device capabilities.
   result = GetRawInputDeviceInfo(hDevice, RIDI_PREPARSEDDATA, NULL, &size);
@@ -371,10 +369,10 @@
     DCHECK_EQ(HIDP_STATUS_SUCCESS, status);
 
     for (uint32_t i = 0; i < count; ++i) {
-      if (button_caps[i].Range.UsageMin <= WebGamepad::kButtonsLengthCap &&
+      if (button_caps[i].Range.UsageMin <= Gamepad::kButtonsLengthCap &&
           button_caps[i].UsagePage == kButtonUsagePage) {
         uint32_t max_index =
-            std::min(WebGamepad::kButtonsLengthCap,
+            std::min(Gamepad::kButtonsLengthCap,
                      static_cast<size_t>(button_caps[i].Range.UsageMax));
         gamepad_info->buttons_length =
             std::max(gamepad_info->buttons_length, max_index);
@@ -392,7 +390,7 @@
 
   for (UINT i = 0; i < count; i++) {
     uint32_t axis_index = axes_caps[i].Range.UsageMin - kAxisMinimumUsageNumber;
-    if (axis_index < WebGamepad::kAxesLengthCap) {
+    if (axis_index < Gamepad::kAxesLengthCap) {
       gamepad_info->axes[axis_index].caps = axes_caps[i];
       gamepad_info->axes[axis_index].value = 0;
       gamepad_info->axes[axis_index].active = true;
@@ -409,13 +407,13 @@
     uint32_t next_index = 0;
     for (UINT i = 0; i < count; i++) {
       uint32_t usage = axes_caps[i].Range.UsageMin - kAxisMinimumUsageNumber;
-      if (usage >= WebGamepad::kAxesLengthCap &&
+      if (usage >= Gamepad::kAxesLengthCap &&
           axes_caps[i].UsagePage <= kGameControlsUsagePage) {
-        for (; next_index < WebGamepad::kAxesLengthCap; ++next_index) {
+        for (; next_index < Gamepad::kAxesLengthCap; ++next_index) {
           if (!gamepad_info->axes[next_index].active)
             break;
         }
-        if (next_index < WebGamepad::kAxesLengthCap) {
+        if (next_index < Gamepad::kAxesLengthCap) {
           gamepad_info->axes[next_index].caps = axes_caps[i];
           gamepad_info->axes[next_index].value = 0;
           gamepad_info->axes[next_index].active = true;
@@ -426,7 +424,7 @@
         }
       }
 
-      if (next_index >= WebGamepad::kAxesLengthCap)
+      if (next_index >= Gamepad::kAxesLengthCap)
         break;
     }
   }
@@ -468,8 +466,7 @@
       for (uint32_t j = 0; j < buttons_length; j++) {
         int32_t button_index = usages[j].Usage - 1;
         if (usages[j].UsagePage == kButtonUsagePage && button_index >= 0 &&
-            button_index <
-                static_cast<int>(blink::WebGamepad::kButtonsLengthCap)) {
+            button_index < static_cast<int>(Gamepad::kButtonsLengthCap)) {
           gamepad_info->buttons[button_index] = true;
         }
       }
diff --git a/device/gamepad/raw_input_data_fetcher_win.h b/device/gamepad/raw_input_data_fetcher_win.h
index 1c13e15..62ae812 100644
--- a/device/gamepad/raw_input_data_fetcher_win.h
+++ b/device/gamepad/raw_input_data_fetcher_win.h
@@ -24,7 +24,7 @@
 #include "build/build_config.h"
 #include "device/gamepad/gamepad_data_fetcher.h"
 #include "device/gamepad/gamepad_standard_mappings.h"
-#include "third_party/WebKit/public/platform/WebGamepads.h"
+#include "device/gamepad/public/cpp/gamepad.h"
 
 namespace device {
 
@@ -49,13 +49,13 @@
   uint32_t vendor_id;
   uint32_t product_id;
 
-  wchar_t id[blink::WebGamepad::kIdLengthCap];
+  wchar_t id[Gamepad::kIdLengthCap];
 
   uint32_t buttons_length;
-  bool buttons[blink::WebGamepad::kButtonsLengthCap];
+  bool buttons[Gamepad::kButtonsLengthCap];
 
   uint32_t axes_length;
-  RawGamepadAxis axes[blink::WebGamepad::kAxesLengthCap];
+  RawGamepadAxis axes[Gamepad::kAxesLengthCap];
 };
 
 class RawInputDataFetcher : public GamepadDataFetcher,
diff --git a/device/gamepad/xbox_data_fetcher_mac.mm b/device/gamepad/xbox_data_fetcher_mac.mm
index f4a235a..f0057c37 100644
--- a/device/gamepad/xbox_data_fetcher_mac.mm
+++ b/device/gamepad/xbox_data_fetcher_mac.mm
@@ -17,8 +17,6 @@
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
 
-using blink::WebGamepad;
-
 namespace device {
 
 namespace {
@@ -228,11 +226,11 @@
 }
 
 void CopyNSStringAsUTF16LittleEndian(NSString* src,
-                                     blink::WebUChar* dest,
+                                     UChar* dest,
                                      size_t dest_len) {
   NSData* as16 = [src dataUsingEncoding:NSUTF16LittleEndianStringEncoding];
   memset(dest, 0, dest_len);
-  [as16 getBytes:dest length:dest_len - sizeof(blink::WebUChar)];
+  [as16 getBytes:dest length:dest_len - sizeof(UChar)];
 }
 
 }  // namespace
@@ -811,7 +809,7 @@
   if (!state)
     return;  // No available slot for this device
 
-  WebGamepad& pad = state->data;
+  Gamepad& pad = state->data;
 
   for (size_t i = 0; i < 6; i++) {
     pad.buttons[i].pressed = data.buttons[i];
diff --git a/device/vr/BUILD.gn b/device/vr/BUILD.gn
index 552b8c9..97903c48 100644
--- a/device/vr/BUILD.gn
+++ b/device/vr/BUILD.gn
@@ -78,6 +78,7 @@
 
       deps += [
         "//device/gamepad",
+        "//device/gamepad/public/cpp:shared_with_blink",
         "//third_party/WebKit/public:blink_headers",
       ]
       ldflags = [ "-landroid" ]
diff --git a/device/vr/DEPS b/device/vr/DEPS
index c1e426f..eca72cd 100644
--- a/device/vr/DEPS
+++ b/device/vr/DEPS
@@ -1,7 +1,7 @@
 include_rules = [
+  "+device/gamepad/public/cpp/gamepads.h",
   "+gpu/command_buffer/common/mailbox_holder.h",
   "+jni",
-  "+third_party/WebKit/public/platform/WebGamepads.h",
   "+third_party/WebKit/public/platform/modules/vr/vr_service.mojom.h",
   "+third_party/gvr-android-sdk/src",
   "+third_party/openvr/src/headers/openvr.h",
diff --git a/device/vr/android/gvr/gvr_gamepad_data_fetcher.cc b/device/vr/android/gvr/gvr_gamepad_data_fetcher.cc
index a18b6c6..8d0bb87 100644
--- a/device/vr/android/gvr/gvr_gamepad_data_fetcher.cc
+++ b/device/vr/android/gvr/gvr_gamepad_data_fetcher.cc
@@ -6,18 +6,16 @@
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 #include "device/vr/android/gvr/gvr_gamepad_data_provider.h"
 #include "device/vr/vr_types.h"
-#include "third_party/WebKit/public/platform/WebGamepads.h"
 
 namespace device {
 
 namespace {
 
-void CopyToWebUString(blink::WebUChar* dest,
-                      size_t dest_length,
-                      base::string16 src) {
-  static_assert(sizeof(base::string16::value_type) == sizeof(blink::WebUChar),
+void CopyToUString(UChar* dest, size_t dest_length, base::string16 src) {
+  static_assert(sizeof(base::string16::value_type) == sizeof(UChar),
                 "Mismatched string16/WebUChar size.");
 
   const size_t str_to_copy = std::min(src.size(), dest_length - 1);
@@ -27,8 +25,6 @@
 
 }  // namespace
 
-using namespace blink;
-
 GvrGamepadDataFetcher::Factory::Factory(GvrGamepadDataProvider* data_provider,
                                         unsigned int display_id)
     : data_provider_(data_provider), display_id_(display_id) {
@@ -85,22 +81,22 @@
   // TODO(bajones): ensure consistency?
   GvrGamepadData provided_data = gamepad_data_;
 
-  WebGamepad& pad = state->data;
+  Gamepad& pad = state->data;
   if (state->active_state == GAMEPAD_NEWLY_ACTIVE) {
     // This is the first time we've seen this device, so do some one-time
     // initialization
     pad.connected = true;
-    CopyToWebUString(pad.id, WebGamepad::kIdLengthCap,
-                     base::UTF8ToUTF16("Daydream Controller"));
-    CopyToWebUString(pad.mapping, WebGamepad::kMappingLengthCap,
-                     base::UTF8ToUTF16(""));
+    CopyToUString(pad.id, Gamepad::kIdLengthCap,
+                  base::UTF8ToUTF16("Daydream Controller"));
+    CopyToUString(pad.mapping, Gamepad::kMappingLengthCap,
+                  base::UTF8ToUTF16(""));
     pad.buttons_length = 1;
     pad.axes_length = 2;
 
     pad.display_id = display_id_;
 
     pad.hand =
-        provided_data.right_handed ? kGamepadHandRight : kGamepadHandLeft;
+        provided_data.right_handed ? GamepadHand::kRight : GamepadHand::kLeft;
   }
 
   pad.timestamp = provided_data.timestamp;
diff --git a/extensions/browser/extension_function_histogram_value.h b/extensions/browser/extension_function_histogram_value.h
index d8a35fad..34432585 100644
--- a/extensions/browser/extension_function_histogram_value.h
+++ b/extensions/browser/extension_function_histogram_value.h
@@ -300,7 +300,7 @@
   DOWNLOADS_SEARCH,
   FONTSETTINGS_CLEARFONT,
   WINDOWS_UPDATE,
-  BOOKMARKMANAGERPRIVATE_CANOPENNEWWINDOWS,
+  DELETED_BOOKMARKMANAGERPRIVATE_CANOPENNEWWINDOWS,
   SERIAL_FLUSH,
   BROWSERACTION_SETTITLE,
   BOOKMARKMANAGERPRIVATE_CANEDIT,
diff --git a/ios/chrome/browser/sync/ios_chrome_synced_tab_delegate.mm b/ios/chrome/browser/sync/ios_chrome_synced_tab_delegate.mm
index 8e7f12f..e954fb9 100644
--- a/ios/chrome/browser/sync/ios_chrome_synced_tab_delegate.mm
+++ b/ios/chrome/browser/sync/ios_chrome_synced_tab_delegate.mm
@@ -9,6 +9,7 @@
 #include "components/sync_sessions/sync_sessions_client.h"
 #include "components/sync_sessions/synced_window_delegate.h"
 #include "components/sync_sessions/synced_window_delegates_getter.h"
+#include "components/sync_sessions/tab_node_pool.h"
 #include "ios/chrome/browser/sessions/ios_chrome_session_tab_helper.h"
 #include "ios/web/public/favicon_status.h"
 #include "ios/web/public/navigation_item.h"
@@ -36,7 +37,8 @@
 }  // namespace
 
 IOSChromeSyncedTabDelegate::IOSChromeSyncedTabDelegate(web::WebState* web_state)
-    : web_state_(web_state), sync_session_id_(0) {}
+    : web_state_(web_state),
+      sync_session_id_(sync_sessions::TabNodePool::kInvalidTabNodeID) {}
 
 IOSChromeSyncedTabDelegate::~IOSChromeSyncedTabDelegate() {}
 
diff --git a/ppapi/shared_impl/DEPS b/ppapi/shared_impl/DEPS
index 7f786933..d6ff4c0 100644
--- a/ppapi/shared_impl/DEPS
+++ b/ppapi/shared_impl/DEPS
@@ -1,5 +1,6 @@
 include_rules = [
   "+base",
+  "+device/gamepad/public/cpp",
   "+gpu",
   "+media/audio",
   "+media/base",
diff --git a/ppapi/shared_impl/ppb_gamepad_shared.cc b/ppapi/shared_impl/ppb_gamepad_shared.cc
index 4ee0dd9..12b732e 100644
--- a/ppapi/shared_impl/ppb_gamepad_shared.cc
+++ b/ppapi/shared_impl/ppb_gamepad_shared.cc
@@ -8,10 +8,13 @@
 
 #include <algorithm>
 
+#include "device/gamepad/public/cpp/gamepads.h"
+
 namespace ppapi {
 
 const size_t WebKitGamepads::kItemsLengthCap;
 
+// TODO: Remove this function and use ConvertDeviceGamepadData() instead.
 void ConvertWebKitGamepadData(const WebKitGamepads& webkit_data,
                               PP_GamepadsSampleData* output_data) {
   output_data->length = WebKitGamepads::kItemsLengthCap;
@@ -34,4 +37,26 @@
   }
 }
 
+void ConvertDeviceGamepadData(const device::Gamepads& device_data,
+                              PP_GamepadsSampleData* output_data) {
+  output_data->length = device::Gamepads::kItemsLengthCap;
+  for (unsigned i = 0; i < device::Gamepads::kItemsLengthCap; ++i) {
+    PP_GamepadSampleData& output_pad = output_data->items[i];
+    const device::Gamepad& device_pad = device_data.items[i];
+    output_pad.connected = device_pad.connected ? PP_TRUE : PP_FALSE;
+    if (device_pad.connected) {
+      static_assert(sizeof(output_pad.id) == sizeof(device_pad.id),
+                    "id size does not match");
+      memcpy(output_pad.id, device_pad.id, sizeof(output_pad.id));
+      output_pad.timestamp = static_cast<double>(device_pad.timestamp);
+      output_pad.axes_length = device_pad.axes_length;
+      for (unsigned j = 0; j < device_pad.axes_length; ++j)
+        output_pad.axes[j] = static_cast<float>(device_pad.axes[j]);
+      output_pad.buttons_length = device_pad.buttons_length;
+      for (unsigned j = 0; j < device_pad.buttons_length; ++j)
+        output_pad.buttons[j] = static_cast<float>(device_pad.buttons[j].value);
+    }
+  }
+}
+
 }  // namespace ppapi
diff --git a/ppapi/shared_impl/ppb_gamepad_shared.h b/ppapi/shared_impl/ppb_gamepad_shared.h
index df95fab..24f3cb0 100644
--- a/ppapi/shared_impl/ppb_gamepad_shared.h
+++ b/ppapi/shared_impl/ppb_gamepad_shared.h
@@ -12,6 +12,10 @@
 #include "ppapi/c/ppb_gamepad.h"
 #include "ppapi/shared_impl/ppapi_shared_export.h"
 
+namespace device {
+class Gamepads;
+}
+
 namespace ppapi {
 
 // TODO(brettw) when we remove the non-IPC-based gamepad implementation, this
@@ -119,6 +123,10 @@
     const WebKitGamepads& webkit_data,
     PP_GamepadsSampleData* output_data);
 
+PPAPI_SHARED_EXPORT void ConvertDeviceGamepadData(
+    const device::Gamepads& device_data,
+    PP_GamepadsSampleData* output_data);
+
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_PPB_GAMEPAD_SHARED_H_
diff --git a/third_party/WebKit/LayoutTests/SlowTests b/third_party/WebKit/LayoutTests/SlowTests
index 8de123bb..5ff05d4 100644
--- a/third_party/WebKit/LayoutTests/SlowTests
+++ b/third_party/WebKit/LayoutTests/SlowTests
@@ -393,6 +393,3 @@
 # which can be very slow.
 crbug.com/678498 external/wpt/service-workers/service-worker/foreign-fetch-cors.https.html [ Slow ]
 crbug.com/678496 external/wpt/service-workers/service-worker/foreign-fetch-basics.https.html [ Slow ]
-
-# Slow on Debug
-crbug.com/710864 [ Debug ] editing/execCommand/delete-non-editable-range-crash.html [ Slow ]
diff --git a/third_party/WebKit/LayoutTests/TestExpectations b/third_party/WebKit/LayoutTests/TestExpectations
index fdd5d99..9617b96 100644
--- a/third_party/WebKit/LayoutTests/TestExpectations
+++ b/third_party/WebKit/LayoutTests/TestExpectations
@@ -2014,7 +2014,6 @@
 crbug.com/711529 http/tests/streams/piping/multiple-propagation.https.html [ Timeout ]
 
 # ====== New tests from wpt-importer added here ======
-crbug.com/626703 external/wpt/streams/writable-streams/properties.sharedworker.html [ Timeout ]
 crbug.com/626703 external/wpt/XMLHttpRequest/getresponseheader-chunked-trailer.htm [ Failure ]
 crbug.com/626703 external/wpt/XMLHttpRequest/anonymous-mode-unsupported.htm [ Failure ]
 crbug.com/626703 external/wpt/XMLHttpRequest/open-after-setrequestheader.htm [ Failure ]
@@ -2064,15 +2063,11 @@
 crbug.com/626703 external/wpt/streams/readable-streams/pipe-through.sharedworker.html [ Timeout ]
 crbug.com/626703 external/wpt/streams/readable-streams/tee.sharedworker.html [ Timeout ]
 crbug.com/626703 external/wpt/streams/readable-streams/templated.sharedworker.html [ Timeout ]
-crbug.com/626703 external/wpt/streams/writable-streams/aborting.sharedworker.html [ Timeout ]
 crbug.com/626703 external/wpt/streams/writable-streams/bad-strategies.sharedworker.html [ Timeout ]
 crbug.com/626703 external/wpt/streams/writable-streams/bad-underlying-sinks.sharedworker.html [ Timeout ]
 crbug.com/626703 external/wpt/streams/writable-streams/brand-checks.sharedworker.html [ Timeout ]
 crbug.com/626703 external/wpt/streams/writable-streams/byte-length-queuing-strategy.sharedworker.html [ Timeout ]
-crbug.com/626703 external/wpt/streams/writable-streams/close.sharedworker.html [ Timeout ]
-crbug.com/626703 external/wpt/streams/writable-streams/constructor.sharedworker.html [ Timeout ]
 crbug.com/626703 external/wpt/streams/writable-streams/count-queuing-strategy.sharedworker.html [ Timeout ]
-crbug.com/626703 external/wpt/streams/writable-streams/error.sharedworker.html [ Timeout ]
 crbug.com/626703 external/wpt/streams/writable-streams/general.sharedworker.html [ Timeout ]
 crbug.com/626703 external/wpt/streams/writable-streams/reentrant-strategy.sharedworker.html [ Timeout ]
 crbug.com/626703 external/wpt/streams/writable-streams/start.sharedworker.html [ Timeout ]
@@ -2188,7 +2183,6 @@
 crbug.com/626703 external/wpt/html/infrastructure/urls/resolving-urls/query-encoding/windows-1251.html [ Timeout ]
 crbug.com/626703 external/wpt/html/infrastructure/urls/resolving-urls/query-encoding/windows-1252.html [ Timeout ]
 crbug.com/626703 [ Android Mac ] external/wpt/pointerevents/pointerevent_disabled_form_control-manual.html [ Timeout ]
-crbug.com/626703 external/wpt/streams/readable-streams/floating-point-total-queue-size.sharedworker.html [ Timeout ]
 crbug.com/626703 external/wpt/streams/writable-streams/floating-point-total-queue-size.dedicatedworker.html [ Timeout ]
 crbug.com/626703 external/wpt/streams/writable-streams/floating-point-total-queue-size.sharedworker.html [ Timeout ]
 crbug.com/626703 external/wpt/mediacapture-streams/MediaStreamTrack-end-manual.https.html [ Timeout ]
diff --git a/third_party/WebKit/LayoutTests/external/WPT_BASE_MANIFEST.json b/third_party/WebKit/LayoutTests/external/WPT_BASE_MANIFEST.json
index 2499a4e..51c1ff34 100644
--- a/third_party/WebKit/LayoutTests/external/WPT_BASE_MANIFEST.json
+++ b/third_party/WebKit/LayoutTests/external/WPT_BASE_MANIFEST.json
@@ -31,12 +31,240 @@
      {}
     ]
    ],
+   "css/CSS2/floats-clear/floating-replaced-height-008.xht": [
+    [
+     "/css/CSS2/floats-clear/floating-replaced-height-008.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/floats-108.xht": [
+    [
+     "/css/CSS2/floats-clear/floats-108.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/floats-109.xht": [
+    [
+     "/css/CSS2/floats-clear/floats-109.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/floats-110.xht": [
+    [
+     "/css/CSS2/floats-clear/floats-110.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/floats-126.xht": [
+    [
+     "/css/CSS2/floats-clear/floats-126.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/floats-127.xht": [
+    [
+     "/css/CSS2/floats-clear/floats-127.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/floats-128.xht": [
+    [
+     "/css/CSS2/floats-clear/floats-128.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/floats-129.xht": [
+    [
+     "/css/CSS2/floats-clear/floats-129.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/floats-130.xht": [
+    [
+     "/css/CSS2/floats-clear/floats-130.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/floats-131.xht": [
+    [
+     "/css/CSS2/floats-clear/floats-131.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/floats-137.xht": [
+    [
+     "/css/CSS2/floats-clear/floats-137.xht",
+     {}
+    ]
+   ],
    "css/CSS2/linebox/inline-formatting-context-010b.xht": [
     [
      "/css/CSS2/linebox/inline-formatting-context-010b.xht",
      {}
     ]
    ],
+   "css/CSS2/normal-flow/inline-block-002.xht": [
+    [
+     "/css/CSS2/normal-flow/inline-block-002.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/normal-flow/inline-block-003.xht": [
+    [
+     "/css/CSS2/normal-flow/inline-block-003.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/normal-flow/inline-block-004.xht": [
+    [
+     "/css/CSS2/normal-flow/inline-block-004.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/normal-flow/inline-block-005.xht": [
+    [
+     "/css/CSS2/normal-flow/inline-block-005.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/normal-flow/inline-block-replaced-height-008.xht": [
+    [
+     "/css/CSS2/normal-flow/inline-block-replaced-height-008.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/normal-flow/inline-replaced-height-008.xht": [
+    [
+     "/css/CSS2/normal-flow/inline-replaced-height-008.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/normal-flow/inlines-003.xht": [
+    [
+     "/css/CSS2/normal-flow/inlines-003.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/normal-flow/inlines-004.xht": [
+    [
+     "/css/CSS2/normal-flow/inlines-004.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/normal-flow/inlines-005.xht": [
+    [
+     "/css/CSS2/normal-flow/inlines-005.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/normal-flow/inlines-006.xht": [
+    [
+     "/css/CSS2/normal-flow/inlines-006.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/positioning/abspos-inline-001.xht": [
+    [
+     "/css/CSS2/positioning/abspos-inline-001.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/positioning/abspos-inline-002.xht": [
+    [
+     "/css/CSS2/positioning/abspos-inline-002.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/positioning/abspos-inline-003.xht": [
+    [
+     "/css/CSS2/positioning/abspos-inline-003.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/positioning/abspos-inline-004.xht": [
+    [
+     "/css/CSS2/positioning/abspos-inline-004.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/positioning/abspos-inline-005.xht": [
+    [
+     "/css/CSS2/positioning/abspos-inline-005.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/positioning/abspos-inline-006.xht": [
+    [
+     "/css/CSS2/positioning/abspos-inline-006.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/positioning/abspos-paged-001.xht": [
+    [
+     "/css/CSS2/positioning/abspos-paged-001.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/positioning/abspos-paged-002.xht": [
+    [
+     "/css/CSS2/positioning/abspos-paged-002.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/positioning/position-004.xht": [
+    [
+     "/css/CSS2/positioning/position-004.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/positioning/position-fixed-003.xht": [
+    [
+     "/css/CSS2/positioning/position-fixed-003.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/positioning/position-fixed-004.xht": [
+    [
+     "/css/CSS2/positioning/position-fixed-004.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/positioning/position-fixed-005.xht": [
+    [
+     "/css/CSS2/positioning/position-fixed-005.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/positioning/position-relative-020.xht": [
+    [
+     "/css/CSS2/positioning/position-relative-020.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/positioning/position-relative-021.xht": [
+    [
+     "/css/CSS2/positioning/position-relative-021.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/positioning/position-relative-022.xht": [
+    [
+     "/css/CSS2/positioning/position-relative-022.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/positioning/position-relative-034.xht": [
+    [
+     "/css/CSS2/positioning/position-relative-034.xht",
+     {}
+    ]
+   ],
+   "css/CSS2/positioning/position-relative-036.xht": [
+    [
+     "/css/CSS2/positioning/position-relative-036.xht",
+     {}
+    ]
+   ],
    "css/css-flexbox-1/interactive/flexbox_interactive_break-after-column-item.html": [
     [
      "/css/css-flexbox-1/interactive/flexbox_interactive_break-after-column-item.html",
@@ -6681,6 +6909,2166 @@
      {}
     ]
    ],
+   "css/CSS2/floats-clear/adjacent-floats-001.xht": [
+    [
+     "/css/CSS2/floats-clear/adjacent-floats-001.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/adjacent-floats-001-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-001.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-001.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-001-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-002.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-002.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-002-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-003.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-003.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-003-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-004.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-004.xht",
+     [
+      [
+       "/css/CSS2/reference/ref-filled-green-100px-square.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-005.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-005.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-001-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-applies-to-000.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-applies-to-000.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-applies-to-000-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-applies-to-001.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-applies-to-001.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-applies-to-001-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-applies-to-002.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-applies-to-002.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-applies-to-001-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-applies-to-003.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-applies-to-003.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-applies-to-001-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-applies-to-004.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-applies-to-004.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-applies-to-001-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-applies-to-005.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-applies-to-005.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-applies-to-001-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-applies-to-006.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-applies-to-006.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-applies-to-001-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-applies-to-007.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-applies-to-007.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-applies-to-001-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-applies-to-008.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-applies-to-008.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-applies-to-008-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-applies-to-009.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-applies-to-009.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-applies-to-009-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-applies-to-012.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-applies-to-012.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-applies-to-001-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-applies-to-013.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-applies-to-013.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-applies-to-009-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-applies-to-014.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-applies-to-014.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-applies-to-001-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-applies-to-015.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-applies-to-015.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-applies-to-001-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-clearance-calculation-001.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-clearance-calculation-001.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-clearance-calculation-001-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-clearance-calculation-002.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-clearance-calculation-002.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-clearance-calculation-002-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-clearance-calculation-003.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-clearance-calculation-003.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-clearance-calculation-003-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-clearance-calculation-004.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-clearance-calculation-004.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-clearance-calculation-004-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-clearance-calculation-005.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-clearance-calculation-005.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-clearance-calculation-005-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-default-inheritance-001.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-default-inheritance-001.xht",
+     [
+      [
+       "/css/CSS2/reference/ref-filled-green-100px-square.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-float-001.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-float-001.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-float-001-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-float-002.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-float-002.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-float-002-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-float-003.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-float-003.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-float-003-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-float-004.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-float-004.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-float-004-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-float-005.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-float-005.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-float-005-ref.xht",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/CSS2/floats-clear/clear-float-006.xht": [
+    [
+     "/css/CSS2/floats-clear/clear-float-006.xht",
+     [
+      [
+       "/css/CSS2/floats-clear/clear-float-006-ref.xht",
+       "=="
+      ]
+     ],
+     {}
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+  ],
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+  "css/CSS2/positioning/top-offset-003.xht": [
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+  "css/CSS2/positioning/top-offset-percentage-001-ref.xht": [
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+   "4e18ff75863795095389735b96d557a8fbffde44",
+   "reftest"
+  ],
   "css/CSS2/reference/60x60-green.html": [
    "c9d25fc5f68ddf46dbdf1176e719b53a22f915f7",
    "support"
@@ -154054,6 +183271,22 @@
    "0dd816530943f3a6fa3235b1d481f70ca578b6e6",
    "reftest"
   ],
+  "html/rendering/non-replaced-elements/the-page/iframe-body-margin-attributes.html": [
+   "68e9c15f160415a652650331f403dd324cd402e9",
+   "testharness"
+  ],
+  "html/rendering/non-replaced-elements/the-page/iframe-marginwidth-marginheight.html": [
+   "db8b96ffd3b16bc78d937b46860de8c22d857947",
+   "testharness"
+  ],
+  "html/rendering/non-replaced-elements/the-page/support/body-marginwidth-marginheight.html": [
+   "d75fd3830c23860db68fe23589f74a7bdc95be91",
+   "support"
+  ],
+  "html/rendering/non-replaced-elements/the-page/support/body-topmargin-leftmargin.html": [
+   "1c31ddd13c97504f59d1e403f6ab90252fa68e0c",
+   "support"
+  ],
   "html/rendering/non-replaced-elements/the-page/test-body.xhtml": [
    "7a229199399e678847280e6e88e40e5b37bfdd11",
    "support"
@@ -155887,7 +185120,7 @@
    "testharness"
   ],
   "html/semantics/forms/textfieldselection/selection-after-content-change.html": [
-   "c7f9433a664b59f59be933cdf607c158a599dff7",
+   "e256a498b2f958dcc6efde8393a79b61e793642a",
    "testharness"
   ],
   "html/semantics/forms/textfieldselection/selection-not-application-textarea.html": [
diff --git a/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/iframe-body-margin-attributes-expected.txt b/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/iframe-body-margin-attributes-expected.txt
new file mode 100644
index 0000000..eb9ecfe98
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/iframe-body-margin-attributes-expected.txt
@@ -0,0 +1,6 @@
+This is a testharness.js-based test.
+FAIL body marginwidth vs body leftmargin assert_equals: marginTop expected "20px" but got "10px"
+FAIL iframe marginwidth vs child body leftmargin assert_equals: marginTop expected "20px" but got "10px"
+FAIL iframe marginwidth vs child body marginwidth assert_equals: marginTop expected "20px" but got "10px"
+Harness: the test ran to completion.
+
diff --git a/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/iframe-body-margin-attributes.html b/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/iframe-body-margin-attributes.html
new file mode 100644
index 0000000..e1f4fb5
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/iframe-body-margin-attributes.html
@@ -0,0 +1,32 @@
+<!doctype html>
+<title>iframe and body margin attributes</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body marginwidth=20 marginheight=20 topmargin=10 rightmargin=10 bottommargin=10 leftmargin=10>
+<iframe data-desc="iframe marginwidth vs child body leftmargin" src="support/body-topmargin-leftmargin.html" marginwidth=10 marginheight=10></iframe>
+<iframe data-desc="iframe marginwidth vs child body marginwidth" src="support/body-marginwidth-marginheight.html" marginwidth=10 marginheight=10></iframe>
+<script>
+setup({explicit_done: true});
+
+onload = () => {
+  test(() => {
+    const style = getComputedStyle(document.body);
+    assert_style_props(style);
+  }, 'body marginwidth vs body leftmargin');
+
+  [].forEach.call(document.querySelectorAll('iframe'), iframe => {
+    test(() => {
+      const win = iframe.contentWindow;
+      const style = win.getComputedStyle(win.document.body);
+      assert_style_props(style);
+    }, iframe.dataset.desc);
+  });
+  done();
+}
+
+function assert_style_props(style) {
+  for (let prop of ['marginTop', 'marginRight', 'marginBottom', 'marginLeft']) {
+    assert_equals(style[prop], '20px', prop);
+  }
+}
+</script>
diff --git a/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/iframe-marginwidth-marginheight-expected.txt b/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/iframe-marginwidth-marginheight-expected.txt
new file mode 100644
index 0000000..5c9872f7
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/iframe-marginwidth-marginheight-expected.txt
@@ -0,0 +1,4 @@
+This is a testharness.js-based test.
+FAIL iframe marginwidth and marginheight Uncaught Error: assert_equals: Number of attributes on the child document's body expected 0 but got 2
+Harness: the test ran to completion.
+
diff --git a/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/iframe-marginwidth-marginheight.html b/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/iframe-marginwidth-marginheight.html
new file mode 100644
index 0000000..b5b49d1b
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/iframe-marginwidth-marginheight.html
@@ -0,0 +1,11 @@
+<!doctype html>
+<title>iframe marginwidth and marginheight</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<iframe src="/common/blank.html" marginwidth=0 marginheight=0></iframe>
+<script>
+onload = () => {
+  assert_equals(window[0].document.body.attributes.length, 0, "Number of attributes on the child document's body");
+  done();
+}
+</script>
diff --git a/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/support/body-marginwidth-marginheight.html b/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/support/body-marginwidth-marginheight.html
new file mode 100644
index 0000000..5d825e3
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/support/body-marginwidth-marginheight.html
@@ -0,0 +1,2 @@
+<!doctype html>
+<body marginwidth=20 marginheight=20>
diff --git a/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/support/body-topmargin-leftmargin.html b/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/support/body-topmargin-leftmargin.html
new file mode 100644
index 0000000..7ba5e53
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-page/support/body-topmargin-leftmargin.html
@@ -0,0 +1,2 @@
+<!doctype html>
+<body topmargin=20 rightmargin=20 bottommargin=20 leftmargin=20>
diff --git a/third_party/WebKit/LayoutTests/external/wpt/html/semantics/forms/textfieldselection/selection-after-content-change-expected.txt b/third_party/WebKit/LayoutTests/external/wpt/html/semantics/forms/textfieldselection/selection-after-content-change-expected.txt
new file mode 100644
index 0000000..48a72e42
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/html/semantics/forms/textfieldselection/selection-after-content-change-expected.txt
@@ -0,0 +1,16 @@
+This is a testharness.js-based test.
+FAIL input out of document: selection must not change when setting the same value assert_equals: selectionStart must not change expected 1 but got 5
+PASS input out of document: selection must change when setting a different value 
+FAIL input in document: selection must not change when setting the same value assert_equals: selectionStart must not change expected 1 but got 5
+PASS input in document: selection must change when setting a different value 
+FAIL input in document, with focus: selection must not change when setting the same value assert_equals: selectionStart must not change expected 1 but got 5
+PASS input in document, with focus: selection must change when setting a different value 
+PASS textarea out of document: selection must not change when setting the same value 
+PASS textarea out of document: selection must change when setting a different value 
+PASS textarea in document: selection must not change when setting the same value 
+PASS textarea in document: selection must change when setting a different value 
+PASS textarea in document, with focus: selection must not change when setting the same value 
+PASS textarea in document, with focus: selection must change when setting a different value 
+PASS textarea in document: selection must not change when setting the same normalized value 
+Harness: the test ran to completion.
+
diff --git a/third_party/WebKit/LayoutTests/external/wpt/html/semantics/forms/textfieldselection/selection-after-content-change.html b/third_party/WebKit/LayoutTests/external/wpt/html/semantics/forms/textfieldselection/selection-after-content-change.html
index 90ebc28..37f37a8 100644
--- a/third_party/WebKit/LayoutTests/external/wpt/html/semantics/forms/textfieldselection/selection-after-content-change.html
+++ b/third_party/WebKit/LayoutTests/external/wpt/html/semantics/forms/textfieldselection/selection-after-content-change.html
@@ -3,16 +3,115 @@
 <title>Selection indices after content change</title>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
+
+<input id="i1" type="text" value="hello">
+<textarea id="t1">hello</textarea>
+
 <script>
-  test(function() {
-    var input = document.createElement("input");
-    input.focus();
-    input.value = "something something something dark side";
-    input.setSelectionRange(4,20);
-    assert_equals(input.selectionStart, 4);
-    assert_equals(input.selectionEnd, 20);
-    input.value = "It's a trap!";
-    assert_equals(input.selectionStart, input.value.length);
-    assert_equals(input.selectionEnd, input.value.length);
-}, "Selection indices after reseting content");
+"use strict";
+
+// This helper ensures that when the selection direction is reset, it always is reset to the same value consistently
+// (which must be one of either "none" or "forward"). This helps catch bugs like one observed in Chrome, where textareas
+// reset to "none" but inputs reset to "forward".
+let observedResetSelectionDirection
+function assertSelectionDirectionIsReset(element) {
+  if (!observedResetSelectionDirection) {
+    assert_true(element.selectionDirection === "none" || element.selectionDirection === "forward",
+      "selectionDirection must be set to either none or forward");
+    observedResetSelectionDirection = element.selectionDirection;
+  } else {
+    assert_equals(element.selectionDirection, observedResetSelectionDirection,
+      `selectionDirection must be reset to ${observedResetSelectionDirection} (which was previously observed to be ` +
+      `the value after resetting the selection direction)`);
+  }
+}
+
+runTest("input out of document", () => {
+  const input = document.createElement("input");
+  input.value = "hello";
+  return input;
+});
+
+runTest("input in document", () => {
+  return document.querySelector("#i1");
+});
+
+runTest("input in document, with focus", () => {
+  const input = document.querySelector("#i1");
+  input.value = "hello";
+  input.focus();
+  return input;
+});
+
+runTest("textarea out of document", () => {
+  const textarea = document.createElement("textarea");
+  textarea.value = "hello";
+  return textarea;
+});
+
+runTest("textarea in document", () => {
+  return document.querySelector("#t1");
+});
+
+runTest("textarea in document, with focus", () => {
+  const textarea = document.querySelector("#t1");
+  textarea.value = "hello";
+  textarea.focus();
+  return textarea;
+});
+
+function runTest(descriptor, elementFactory) {
+  test(() => {
+    const element = elementFactory();
+    element.setSelectionRange(1, 3, "backward");
+
+    assert_equals(element.selectionStart, 1, "Sanity check: selectionStart was set correctly");
+    assert_equals(element.selectionEnd, 3, "Sanity check: selectionEnd was set correctly");
+    assert_equals(element.selectionDirection, "backward", "Sanity check: selectionDirection was set correctly");
+
+    element.value = "hello";
+
+    assert_equals(element.selectionStart, 1, "selectionStart must not change");
+    assert_equals(element.selectionEnd, 3, "selectionEnd must not change");
+    assert_equals(element.selectionDirection, "backward", "selectionDirection must not change");
+  }, `${descriptor}: selection must not change when setting the same value`);
+
+  test(() => {
+    const element = elementFactory();
+    element.setSelectionRange(1, 3, "backward");
+
+    assert_equals(element.selectionStart, 1, "Sanity check: selectionStart was set correctly");
+    assert_equals(element.selectionEnd, 3, "Sanity check: selectionEnd was set correctly");
+    assert_equals(element.selectionDirection, "backward", "Sanity check: selectionDirection was set correctly");
+
+    element.value = "hello2";
+
+    assert_equals(element.selectionStart, element.value.length, "selectionStart must be reset to the end");
+    assert_equals(element.selectionEnd, element.value.length, "selectionEnd must be reset to the end");
+    assertSelectionDirectionIsReset(element);
+  }, `${descriptor}: selection must change when setting a different value`);
+}
+
+test(() => {
+  const textarea = document.querySelector("#t1");
+  textarea.value = "hell\no";
+  textarea.setSelectionRange(1, 3, "backward");
+
+  assert_equals(textarea.selectionStart, 1, "Sanity check: selectionStart was set correctly");
+  assert_equals(textarea.selectionEnd, 3, "Sanity check: selectionEnd was set correctly");
+  assert_equals(textarea.selectionDirection, "backward", "Sanity check: selectionDirection was set correctly");
+
+  textarea.value = "hell\r\no";
+
+  assert_equals(textarea.selectionStart, 1, "selectionStart must not change when setting to CRLF");
+  assert_equals(textarea.selectionEnd, 3, "selectionEnd must not change when setting to CRLF");
+  assert_equals(textarea.selectionDirection, "backward", "selectionDirection must not change when setting to CRLF");
+
+  textarea.value = "hell\ro";
+
+  assert_equals(textarea.selectionStart, 1, "selectionStart must not change when setting to CR");
+  assert_equals(textarea.selectionEnd, 3, "selectionEnd must not change when setting to CR");
+  assert_equals(textarea.selectionDirection, "backward", "selectionDirection must not change when setting to CR");
+}, "textarea in document: selection must not change when setting the same normalized value");
+
 </script>
diff --git a/third_party/WebKit/LayoutTests/external/wpt/resources/testharness.js b/third_party/WebKit/LayoutTests/external/wpt/resources/testharness.js
index 1a313aab..006d715d 100644
--- a/third_party/WebKit/LayoutTests/external/wpt/resources/testharness.js
+++ b/third_party/WebKit/LayoutTests/external/wpt/resources/testharness.js
@@ -1980,6 +1980,7 @@
             }
         } else if (is_shared_worker(worker)) {
             message_port = worker.port;
+            message_port.start();
         } else {
             message_port = worker;
         }
diff --git a/third_party/WebKit/LayoutTests/external/wpt/streams/readable-streams/floating-point-total-queue-size.sharedworker-expected.txt b/third_party/WebKit/LayoutTests/external/wpt/streams/readable-streams/floating-point-total-queue-size.sharedworker-expected.txt
new file mode 100644
index 0000000..41e78c1b
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/streams/readable-streams/floating-point-total-queue-size.sharedworker-expected.txt
@@ -0,0 +1,7 @@
+This is a testharness.js-based test.
+FAIL Floating point arithmetic must manifest near NUMBER.MAX_SAFE_INTEGER (total ends up positive) assert_equals: [[queueTotalSize]] must clamp to 0 if it becomes negative expected 0 but got 1
+FAIL Floating point arithmetic must manifest near 0 (total ends up positive, but clamped) assert_equals: [[queueTotalSize]] must clamp to 0 if it becomes negative expected 0 but got 1.1102230246251565e-16
+PASS Floating point arithmetic must manifest near 0 (total ends up positive, and not clamped) 
+PASS Floating point arithmetic must manifest near 0 (total ends up zero) 
+Harness: the test ran to completion.
+
diff --git a/third_party/WebKit/LayoutTests/external/wpt/streams/writable-streams/aborting.sharedworker-expected.txt b/third_party/WebKit/LayoutTests/external/wpt/streams/writable-streams/aborting.sharedworker-expected.txt
new file mode 100644
index 0000000..fd7a2e2
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/streams/writable-streams/aborting.sharedworker-expected.txt
@@ -0,0 +1,52 @@
+This is a testharness.js-based test.
+Harness Error. harness_status.status = 1 , harness_status.message = error2
+PASS Aborting a WritableStream before it starts should cause the writer's unsettled ready promise to reject 
+PASS Aborting a WritableStream should cause the writer's fulfilled ready promise to reset to a rejected one 
+PASS abort() on a released writer rejects 
+PASS Aborting a WritableStream immediately prevents future writes 
+PASS Aborting a WritableStream prevents further writes after any that are in progress 
+PASS Fulfillment value of ws.abort() call must be undefined even if the underlying sink returns a non-undefined value 
+PASS WritableStream if sink's abort throws, the promise returned by writer.abort() rejects 
+PASS WritableStream if sink's abort throws, the promise returned by ws.abort() rejects 
+PASS WritableStream if sink's abort throws, for an abort performed during a write, the promise returned by ws.abort() rejects 
+PASS Aborting a WritableStream passes through the given reason 
+PASS Aborting a WritableStream puts it in an errored state, with a TypeError as the stored error 
+PASS Aborting a WritableStream causes any outstanding write() promises to be rejected with a TypeError 
+PASS Closing but then immediately aborting a WritableStream causes the stream to error 
+PASS Closing a WritableStream and aborting it while it closes causes the stream to ignore the abort attempt 
+PASS Aborting a WritableStream after it is closed is a no-op 
+PASS WritableStream should NOT call underlying sink's close if no abort is supplied (historical) 
+PASS returning a thenable from abort() should work 
+PASS .closed should not resolve before fulfilled write() 
+FAIL .closed should not resolve before rejected write(); write() error should not overwrite abort() error promise_test: Unhandled rejection with value: object "error1: error1"
+PASS writes should be satisfied in order when aborting 
+FAIL writes should be satisfied in order after rejected write when aborting promise_test: Unhandled rejection with value: object "error1: error1"
+FAIL close() should reject with TypeError when abort() is first error promise_test: Unhandled rejection with value: object "error1: error1"
+PASS underlying abort() should not be called until underlying write() completes 
+PASS underlying abort() should not be called if underlying close() has started 
+PASS if underlying close() has started and then rejects, the abort() and close() promises should reject with the underlying close rejection reason 
+PASS an abort() that happens during a write() should trigger the underlying abort() even with a close() queued 
+PASS if a writer is created for a stream with a pending abort, its ready should be rejected with a TypeError 
+PASS writer close() promise should resolve before abort() promise 
+PASS writer.ready should reject on controller error without waiting for underlying write 
+FAIL writer.abort() while there is an in-flight write, and then finish the write with rejection promise_test: Unhandled rejection with value: object "error2: error2"
+FAIL writer.abort(), controller.error() while there is an in-flight write, and then finish the write assert_throws: writePromise3 must reject with an error indicating abort function "function () { throw e }" threw object "error2: error2" ("error2") expected object "TypeError" ("TypeError")
+FAIL writer.abort(), controller.error() while there is an in-flight close, and then finish the close promise_test: Unhandled rejection with value: object "error2: error2"
+FAIL controller.error(), writer.abort() while there is an in-flight write, and then finish the write assert_array_equals: writePromise and writer.closed must not be fulfilled/rejected yet even after writer.abort() lengths differ, expected 0 got 1
+FAIL controller.error(), writer.abort() while there is an in-flight close, and then finish the close promise_test: Unhandled rejection with value: object "error2: error2"
+PASS releaseLock() while aborting should reject the original closed promise 
+FAIL releaseLock() during delayed async abort() should reject the writer.closed promise assert_equals: closed promise should not have changed expected object "[object Promise]" but got object "[object Promise]"
+PASS sink abort() should not be called until sink start() is done 
+FAIL if start attempts to error the controller after abort() has been called, then it should lose promise_test: Unhandled rejection with value: object "error1: error1"
+FAIL stream abort() promise should still resolve if sink start() rejects promise_test: Unhandled rejection with value: object "error1: error1"
+PASS writer abort() during sink start() should replace the writer.ready promise synchronously 
+FAIL promises returned from other writer methods should be rejected when writer abort() happens during sink start() assert_array_equals: promises should resolve in the standard order property 1, expected "write1" but got "close"
+FAIL abort() should succeed despite rejection from write promise_test: Unhandled rejection with value: object "error1: error1"
+FAIL abort() should be rejected with the rejection returned from close() assert_throws: abort() should reject with error2 function "function () { throw e }" threw object "error1: error1" ("error1") expected object "error2: error2" ("error2")
+FAIL a rejecting sink.write() should not prevent sink.abort() from being called promise_test: Unhandled rejection with value: object "error1: error1"
+FAIL when start errors after stream abort(), underlying sink abort() should be called anyway promise_test: Unhandled rejection with value: object "error1: error1"
+PASS when calling abort() twice on the same stream, the second call should reject 
+PASS sink abort() should not be called if stream was erroring due to controller.error() before abort() was called 
+PASS sink abort() should not be called if stream was erroring due to bad strategy before abort() was called 
+Harness: the test ran to completion.
+
diff --git a/third_party/WebKit/LayoutTests/external/wpt/streams/writable-streams/close.sharedworker-expected.txt b/third_party/WebKit/LayoutTests/external/wpt/streams/writable-streams/close.sharedworker-expected.txt
new file mode 100644
index 0000000..400571fc
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/streams/writable-streams/close.sharedworker-expected.txt
@@ -0,0 +1,21 @@
+This is a testharness.js-based test.
+PASS fulfillment value of ws.close() call must be undefined even if the underlying sink returns a non-undefined value 
+FAIL when sink calls error asynchronously while sink close is in-flight, the stream should not become errored promise_test: Unhandled rejection with value: object "error1: error1"
+FAIL when sink calls error synchronously while closing, the stream should not become errored promise_test: Unhandled rejection with value: object "Error: error me"
+PASS when the sink throws during close, and the close is requested while a write is still in-flight, the stream should become errored during the close 
+PASS releaseLock on a stream with a pending write in which the stream has been errored 
+PASS releaseLock on a stream with a pending close in which controller.error() was called 
+PASS when close is called on a WritableStream in writable state, ready should return a fulfilled promise 
+PASS when close is called on a WritableStream in waiting state, ready promise should be fulfilled 
+PASS when close is called on a WritableStream in waiting state, ready should be fulfilled immediately even if close takes a long time 
+PASS returning a thenable from close() should work 
+PASS releaseLock() should not change the result of sync close() 
+PASS releaseLock() should not change the result of async close() 
+PASS close() should set state to CLOSED even if writer has detached 
+PASS the promise returned by async abort during close should resolve 
+PASS promises must fulfill/reject in the expected order on closure 
+FAIL promises must fulfill/reject in the expected order on aborted closure assert_array_equals: promises must fulfill/reject in the expected order property 1, expected "abortPromise" but got "closed"
+FAIL promises must fulfill/reject in the expected order on aborted and errored closure assert_throws: writer.closed must reject with a TypeError indicating the stream was aborted function "function () { throw e }" threw object "error1: error1" ("error1") expected object "TypeError" ("TypeError")
+FAIL close() should not reject until no sink methods are in flight assert_false: expected false got true
+Harness: the test ran to completion.
+
diff --git a/third_party/WebKit/LayoutTests/external/wpt/streams/writable-streams/constructor.sharedworker-expected.txt b/third_party/WebKit/LayoutTests/external/wpt/streams/writable-streams/constructor.sharedworker-expected.txt
new file mode 100644
index 0000000..1998efd
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/streams/writable-streams/constructor.sharedworker-expected.txt
@@ -0,0 +1,15 @@
+This is a testharness.js-based test.
+PASS controller argument should be passed to start method 
+PASS controller argument should be passed to write method 
+FAIL controller argument should not be passed to close method assert_array_equals: no arguments should be passed to close lengths differ, expected 0 got 1
+PASS highWaterMark should be reflected to desiredSize 
+PASS WritableStream should be writable and ready should fulfill immediately if the strategy does not apply backpressure 
+PASS WritableStream should be constructible with no arguments 
+PASS WritableStream instances should have standard methods and properties 
+PASS private constructors should not be exported 
+PASS WritableStreamDefaultController constructor should throw unless passed a WritableStream 
+PASS WritableStreamDefaultController constructor should throw when passed an initialised WritableStream 
+PASS WritableStreamDefaultWriter should throw unless passed a WritableStream 
+PASS WritableStreamDefaultWriter constructor should throw when stream argument is locked 
+Harness: the test ran to completion.
+
diff --git a/third_party/WebKit/LayoutTests/external/wpt/streams/writable-streams/error.sharedworker-expected.txt b/third_party/WebKit/LayoutTests/external/wpt/streams/writable-streams/error.sharedworker-expected.txt
new file mode 100644
index 0000000..e3bb1267
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/streams/writable-streams/error.sharedworker-expected.txt
@@ -0,0 +1,8 @@
+This is a testharness.js-based test.
+PASS controller.error() should error the stream 
+PASS controller.error() on erroring stream should not throw 
+FAIL surplus calls to controller.error() should be a no-op Cannot error a errored writable stream
+FAIL controller.error() on errored stream should not throw promise_test: Unhandled rejection with value: object "TypeError: Cannot error a errored writable stream"
+FAIL controller.error() on closed stream should not throw promise_test: Unhandled rejection with value: object "TypeError: Cannot error a closed writable stream"
+Harness: the test ran to completion.
+
diff --git a/third_party/WebKit/LayoutTests/external/wpt/streams/writable-streams/properties.sharedworker-expected.txt b/third_party/WebKit/LayoutTests/external/wpt/streams/writable-streams/properties.sharedworker-expected.txt
new file mode 100644
index 0000000..6fe9cca
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/streams/writable-streams/properties.sharedworker-expected.txt
@@ -0,0 +1,47 @@
+This is a testharness.js-based test.
+PASS WritableStreamDefaultController should not be exported on the global object 
+PASS WritableStreamDefaultWriter should not be exported on the global object 
+PASS WritableStream.prototype.constructor should have standard properties 
+PASS WritableStream.prototype.constructor should be a constructor 
+PASS WritableStream.prototype.locked should have standard properties 
+PASS WritableStream.prototype.locked should be a getter 
+PASS WritableStream.prototype.abort should have standard properties 
+PASS WritableStream.prototype.abort should be a method 
+PASS WritableStream.prototype.getWriter should have standard properties 
+PASS WritableStream.prototype.getWriter should be a method 
+PASS WritableStream.prototype should have exactly the expected properties 
+PASS WritableStreamDefaultController.prototype.constructor should have standard properties 
+PASS WritableStreamDefaultController.prototype.constructor should be a constructor 
+PASS WritableStreamDefaultController.prototype.error should have standard properties 
+PASS WritableStreamDefaultController.prototype.error should be a method 
+PASS WritableStreamDefaultController.prototype should have exactly the expected properties 
+PASS WritableStreamDefaultWriter.prototype.constructor should have standard properties 
+PASS WritableStreamDefaultWriter.prototype.constructor should be a constructor 
+PASS WritableStreamDefaultWriter.prototype.closed should have standard properties 
+PASS WritableStreamDefaultWriter.prototype.closed should be a getter 
+PASS WritableStreamDefaultWriter.prototype.desiredSize should have standard properties 
+PASS WritableStreamDefaultWriter.prototype.desiredSize should be a getter 
+PASS WritableStreamDefaultWriter.prototype.ready should have standard properties 
+PASS WritableStreamDefaultWriter.prototype.ready should be a getter 
+PASS WritableStreamDefaultWriter.prototype.abort should have standard properties 
+PASS WritableStreamDefaultWriter.prototype.abort should be a method 
+PASS WritableStreamDefaultWriter.prototype.close should have standard properties 
+PASS WritableStreamDefaultWriter.prototype.close should be a method 
+PASS WritableStreamDefaultWriter.prototype.releaseLock should have standard properties 
+PASS WritableStreamDefaultWriter.prototype.releaseLock should be a method 
+PASS WritableStreamDefaultWriter.prototype.write should have standard properties 
+PASS WritableStreamDefaultWriter.prototype.write should be a method 
+PASS WritableStreamDefaultWriter.prototype should have exactly the expected properties 
+PASS sink method start should be called with the right number of arguments 
+PASS sink method start should be called even when it's located on the prototype chain 
+PASS sink method write should be called with the right number of arguments 
+PASS sink method write should be called even when it's located on the prototype chain 
+PASS unexpected properties should not be accessed when calling sink method write 
+FAIL sink method close should be called with the right number of arguments assert_equals: close should be called with 0 arguments expected 0 but got 1
+PASS sink method close should be called even when it's located on the prototype chain 
+PASS unexpected properties should not be accessed when calling sink method close 
+PASS sink method abort should be called with the right number of arguments 
+PASS sink method abort should be called even when it's located on the prototype chain 
+PASS unexpected properties should not be accessed when calling sink method abort 
+Harness: the test ran to completion.
+
diff --git a/third_party/WebKit/LayoutTests/fast/dom/custom/svg-use-shadow-tree-expected.txt b/third_party/WebKit/LayoutTests/fast/dom/custom/svg-use-shadow-tree-expected.txt
index 44b1be1..ea0d3ce 100644
--- a/third_party/WebKit/LayoutTests/fast/dom/custom/svg-use-shadow-tree-expected.txt
+++ b/third_party/WebKit/LayoutTests/fast/dom/custom/svg-use-shadow-tree-expected.txt
@@ -1,7 +1,7 @@
-CONSOLE ERROR: line 2534: Uncaught Error: assert_false: Should not call createdCallback in UA ShadowRoot. expected false got true
-CONSOLE ERROR: line 2534: Uncaught Error: assert_false: Should not call attachedCallback in UA ShadowRoot. expected false got true
-CONSOLE ERROR: line 2534: Uncaught Error: assert_false: Should not call createdCallback in UA ShadowRoot. expected false got true
-CONSOLE ERROR: line 2534: Uncaught Error: assert_false: Should not call attachedCallback in UA ShadowRoot. expected false got true
+CONSOLE ERROR: line 2535: Uncaught Error: assert_false: Should not call createdCallback in UA ShadowRoot. expected false got true
+CONSOLE ERROR: line 2535: Uncaught Error: assert_false: Should not call attachedCallback in UA ShadowRoot. expected false got true
+CONSOLE ERROR: line 2535: Uncaught Error: assert_false: Should not call createdCallback in UA ShadowRoot. expected false got true
+CONSOLE ERROR: line 2535: Uncaught Error: assert_false: Should not call attachedCallback in UA ShadowRoot. expected false got true
 This is a testharness.js-based test.
 Harness Error. harness_status.status = 1 , harness_status.message = Uncaught Error: assert_false: Should not call attachedCallback in UA ShadowRoot. expected false got true
 PASS SVG <use> shadow trees should not be exposed through custom elements. 
diff --git a/third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-do-not-bind-dirty-sourcecode.html b/third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-do-not-bind-dirty-sourcecode.html
index 3d800090..59aa4d7 100644
--- a/third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-do-not-bind-dirty-sourcecode.html
+++ b/third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-do-not-bind-dirty-sourcecode.html
@@ -10,6 +10,7 @@
 
 function test()
 {
+    Runtime.experiments.enableForTest('persistence2');
     var testMapping = InspectorTest.initializeTestMapping();
     var fs = new InspectorTest.TestFileSystem("file:///var/www");
     InspectorTest.addFooJSFile(fs);
diff --git a/third_party/WebKit/LayoutTests/http/tests/webaudio/autoplay-crossorigin-expected.txt b/third_party/WebKit/LayoutTests/http/tests/webaudio/autoplay-crossorigin-expected.txt
index 2a225ee..d6b55d0 100644
--- a/third_party/WebKit/LayoutTests/http/tests/webaudio/autoplay-crossorigin-expected.txt
+++ b/third_party/WebKit/LayoutTests/http/tests/webaudio/autoplay-crossorigin-expected.txt
@@ -1,7 +1,7 @@
 CONSOLE WARNING: line 13: An AudioContext in a cross origin iframe must be created or resumed from a user gesture to enable audio output.
 CONSOLE WARNING: line 23: An AudioContext in a cross origin iframe must be created or resumed from a user gesture to enable audio output.
 CONSOLE WARNING: line 36: An AudioContext in a cross origin iframe must be created or resumed from a user gesture to enable audio output.
-CONSOLE ERROR: line 2534: Uncaught Error: assert_equals: stateAfterClick expected "running" but got "suspended"
+CONSOLE ERROR: line 2535: Uncaught Error: assert_equals: stateAfterClick expected "running" but got "suspended"
 This is a testharness.js-based test.
 Harness Error. harness_status.status = 1 , harness_status.message = Uncaught Error: assert_equals: stateAfterClick expected "running" but got "suspended"
 PASS Verify that autoplaying Web Audio from a cross origin iframe is blocked by mediaPlaybackRequiresUserGesture 
diff --git a/third_party/WebKit/LayoutTests/inspector/quick-open/command-menu-expected.txt b/third_party/WebKit/LayoutTests/inspector/quick-open/command-menu-expected.txt
index 10208fc..812da80 100644
--- a/third_party/WebKit/LayoutTests/inspector/quick-open/command-menu-expected.txt
+++ b/third_party/WebKit/LayoutTests/inspector/quick-open/command-menu-expected.txt
@@ -10,6 +10,7 @@
 Has category: Mobile
 Has category: Network
 Has category: Panel
+Has category: Settings
 Has category: Sources
 
 Switching to console panel
diff --git a/third_party/WebKit/LayoutTests/resources/testharness.js b/third_party/WebKit/LayoutTests/resources/testharness.js
index 1a313aab..006d715d 100644
--- a/third_party/WebKit/LayoutTests/resources/testharness.js
+++ b/third_party/WebKit/LayoutTests/resources/testharness.js
@@ -1980,6 +1980,7 @@
             }
         } else if (is_shared_worker(worker)) {
             message_port = worker.port;
+            message_port.start();
         } else {
             message_port = worker;
         }
diff --git a/third_party/WebKit/Source/core/dom/AncestorList.h b/third_party/WebKit/Source/core/dom/AncestorList.h
new file mode 100644
index 0000000..1eb020e
--- /dev/null
+++ b/third_party/WebKit/Source/core/dom/AncestorList.h
@@ -0,0 +1,22 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef AncestorList_h
+#define AncestorList_h
+
+#include "platform/weborigin/KURL.h"
+#include "platform/weborigin/KURLHash.h"
+#include "platform/wtf/HashSet.h"
+
+namespace blink {
+
+// Maps to "ancestor list" concept referenced in multiple module script
+// algorithms.
+// Example:
+// https://html.spec.whatwg.org/#internal-module-script-graph-fetching-procedure
+using AncestorList = HashSet<KURL>;
+
+}  // namespace blink
+
+#endif
diff --git a/third_party/WebKit/Source/core/dom/BUILD.gn b/third_party/WebKit/Source/core/dom/BUILD.gn
index 496dab61..01139383 100644
--- a/third_party/WebKit/Source/core/dom/BUILD.gn
+++ b/third_party/WebKit/Source/core/dom/BUILD.gn
@@ -12,6 +12,7 @@
     "AXObjectCache.h",
     "AccessibleNode.cpp",
     "AccessibleNode.h",
+    "AncestorList.h",
     "AnimationWorkletProxyClient.h",
     "Attr.cpp",
     "Attr.h",
diff --git a/third_party/WebKit/Source/core/dom/Modulator.h b/third_party/WebKit/Source/core/dom/Modulator.h
index f6f34ec..e3a00c5 100644
--- a/third_party/WebKit/Source/core/dom/Modulator.h
+++ b/third_party/WebKit/Source/core/dom/Modulator.h
@@ -8,6 +8,7 @@
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "bindings/core/v8/V8PerContextData.h"
 #include "core/CoreExport.h"
+#include "core/dom/AncestorList.h"
 #include "platform/heap/Handle.h"
 #include "platform/loader/fetch/AccessControlStatus.h"
 #include "platform/weborigin/KURL.h"
@@ -29,11 +30,18 @@
 // A SingleModuleClient is notified when single module script node (node as in a
 // module tree graph) load is complete and its corresponding entry is created in
 // module map.
-class SingleModuleClient : public GarbageCollectedMixin {
+class CORE_EXPORT SingleModuleClient : public GarbageCollectedMixin {
  public:
   virtual void NotifyModuleLoadFinished(ModuleScript*) = 0;
 };
 
+// A ModuleTreeClient is notified when a module script and its whole descendent
+// tree load is complete.
+class CORE_EXPORT ModuleTreeClient : public GarbageCollectedMixin {
+ public:
+  virtual void NotifyModuleTreeLoadFinished(ModuleScript*) = 0;
+};
+
 // spec: "top-level module fetch flag"
 // https://html.spec.whatwg.org/multipage/webappapis.html#fetching-scripts-is-top-level
 enum class ModuleGraphLevel { kTopLevelModuleFetch, kDependentModuleFetch };
@@ -62,6 +70,23 @@
   virtual ReferrerPolicy GetReferrerPolicy() = 0;
   virtual SecurityOrigin* GetSecurityOrigin() = 0;
 
+  // https://html.spec.whatwg.org/multipage/webappapis.html#fetch-a-module-script-tree
+  virtual void FetchTree(const ModuleScriptFetchRequest&,
+                         ModuleTreeClient*) = 0;
+
+  // https://html.spec.whatwg.org/#internal-module-script-graph-fetching-procedure
+  virtual void FetchTreeInternal(const ModuleScriptFetchRequest&,
+                                 const AncestorList&,
+                                 ModuleGraphLevel,
+                                 ModuleTreeClient*) = 0;
+
+  // Asynchronously retrieve a module script from the module map, or fetch it
+  // and put it in the map if it's not there already.
+  // https://html.spec.whatwg.org/#fetch-a-single-module-script
+  virtual void FetchSingle(const ModuleScriptFetchRequest&,
+                           ModuleGraphLevel,
+                           SingleModuleClient*) = 0;
+
   // Synchronously retrieves a single module script from existing module map
   // entry.
   virtual ModuleScript* GetFetchedModuleScript(const KURL&) = 0;
diff --git a/third_party/WebKit/Source/core/frame/BUILD.gn b/third_party/WebKit/Source/core/frame/BUILD.gn
index c723c11..4156f57d 100644
--- a/third_party/WebKit/Source/core/frame/BUILD.gn
+++ b/third_party/WebKit/Source/core/frame/BUILD.gn
@@ -41,6 +41,7 @@
     "FrameConsole.h",
     "FrameLifecycle.cpp",
     "FrameLifecycle.h",
+    "FrameOrPlugin.h",
     "FrameOwner.h",
     "FrameSerializer.cpp",
     "FrameSerializer.h",
diff --git a/third_party/WebKit/Source/core/frame/FrameOrPlugin.h b/third_party/WebKit/Source/core/frame/FrameOrPlugin.h
new file mode 100644
index 0000000..426cd53
--- /dev/null
+++ b/third_party/WebKit/Source/core/frame/FrameOrPlugin.h
@@ -0,0 +1,32 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef FrameOrPlugin_h
+#define FrameOrPlugin_h
+
+#include "core/CoreExport.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class CullRect;
+class GraphicsContext;
+class IntRect;
+
+// FrameOrPlugin is a pure virtual class which is implemented by FrameView,
+// RemoteFrameView, and PluginView.
+class CORE_EXPORT FrameOrPlugin : public GarbageCollectedMixin {
+ public:
+  virtual ~FrameOrPlugin() {}
+
+  virtual void SetFrameRect(const IntRect&) = 0;
+  virtual const IntRect& FrameRect() const = 0;
+  virtual void Paint(GraphicsContext&, const CullRect&) const = 0;
+  virtual void Show() = 0;
+  virtual void Hide() = 0;
+  virtual void Dispose() = 0;
+};
+
+}  // namespace blink
+#endif  // FrameOrPlugin_h
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index f0ebc36..89193ab 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -1505,9 +1505,8 @@
     if (GetLayoutViewItem().IsNull())
       break;
 
-    if (FrameViewBase* frame_view_base = part->PluginOrFrame()) {
-      if (frame_view_base->IsFrameView()) {
-        FrameView* frame_view = ToFrameView(frame_view_base);
+    if (part->GetFrameOrPlugin()) {
+      if (FrameView* frame_view = part->ChildFrameView()) {
         bool did_need_layout = frame_view->NeedsLayout();
         part->UpdateGeometry();
         if (!did_need_layout && !frame_view->ShouldThrottleRendering())
@@ -4767,8 +4766,6 @@
         plugin->SetParentVisible(true);
     }
   }
-
-  FrameViewBase::Show();
 }
 
 void FrameView::Hide() {
@@ -4794,8 +4791,6 @@
       SetNeedsPaintPropertyUpdate();
     }
   }
-
-  FrameViewBase::Hide();
 }
 
 int FrameView::ViewportWidth() const {
diff --git a/third_party/WebKit/Source/core/frame/FrameView.h b/third_party/WebKit/Source/core/frame/FrameView.h
index 53df8155..6ee56bb0 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.h
+++ b/third_party/WebKit/Source/core/frame/FrameView.h
@@ -29,6 +29,7 @@
 #include <memory>
 #include "core/CoreExport.h"
 #include "core/dom/DocumentLifecycle.h"
+#include "core/frame/FrameOrPlugin.h"
 #include "core/frame/FrameViewAutoSizeInfo.h"
 #include "core/frame/LayoutSubtreeRootList.h"
 #include "core/frame/RootFrameViewport.h"
@@ -71,6 +72,7 @@
 class ElementVisibilityObserver;
 class Frame;
 class FloatSize;
+class IntRect;
 class JSONArray;
 class JSONObject;
 class LayoutItem;
@@ -101,6 +103,7 @@
 
 class CORE_EXPORT FrameView final
     : public FrameViewBase,
+      public FrameOrPlugin,
       public PaintInvalidationCapableScrollableArea {
   USING_GARBAGE_COLLECTED_MIXIN(FrameView);
 
@@ -114,8 +117,12 @@
 
   ~FrameView() override;
 
-  void InvalidateRect(const IntRect&) override;
+  void Invalidate() { InvalidateRect(IntRect(0, 0, Width(), Height())); }
+  void InvalidateRect(const IntRect&);
   void SetFrameRect(const IntRect&) override;
+  const IntRect& FrameRect() const override {
+    return FrameViewBase::FrameRect();
+  }
 
   LocalFrame& GetFrame() const {
     ASSERT(frame_);
diff --git a/third_party/WebKit/Source/core/frame/RemoteFrameView.cpp b/third_party/WebKit/Source/core/frame/RemoteFrameView.cpp
index 5255fd0..dd78431 100644
--- a/third_party/WebKit/Source/core/frame/RemoteFrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/RemoteFrameView.cpp
@@ -115,16 +115,12 @@
 void RemoteFrameView::Hide() {
   SetSelfVisible(false);
 
-  FrameViewBase::Hide();
-
   remote_frame_->Client()->VisibilityChanged(false);
 }
 
 void RemoteFrameView::Show() {
   SetSelfVisible(true);
 
-  FrameViewBase::Show();
-
   remote_frame_->Client()->VisibilityChanged(true);
 }
 
diff --git a/third_party/WebKit/Source/core/frame/RemoteFrameView.h b/third_party/WebKit/Source/core/frame/RemoteFrameView.h
index 3a1f93d5..886ec9a3 100644
--- a/third_party/WebKit/Source/core/frame/RemoteFrameView.h
+++ b/third_party/WebKit/Source/core/frame/RemoteFrameView.h
@@ -5,15 +5,20 @@
 #ifndef RemoteFrameView_h
 #define RemoteFrameView_h
 
+#include "core/frame/FrameOrPlugin.h"
 #include "platform/FrameViewBase.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
+class CullRect;
+class GraphicsContext;
 class RemoteFrame;
 
-class RemoteFrameView final : public FrameViewBase {
+class RemoteFrameView final : public FrameViewBase, public FrameOrPlugin {
+  USING_GARBAGE_COLLECTED_MIXIN(RemoteFrameView);
+
  public:
   static RemoteFrameView* Create(RemoteFrame*);
 
@@ -30,8 +35,12 @@
   void Dispose() override;
   // Override to notify remote frame that its viewport size has changed.
   void FrameRectsChanged() override;
-  void InvalidateRect(const IntRect&) override;
+  void InvalidateRect(const IntRect&);
   void SetFrameRect(const IntRect&) override;
+  const IntRect& FrameRect() const override {
+    return FrameViewBase::FrameRect();
+  }
+  void Paint(GraphicsContext&, const CullRect&) const override {}
   void Hide() override;
   void Show() override;
   void SetParentVisible(bool) override;
diff --git a/third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.cpp b/third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.cpp
index 90d7742..f7cde74 100644
--- a/third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.cpp
@@ -34,6 +34,7 @@
 #include "core/loader/FrameLoader.h"
 #include "core/page/Page.h"
 #include "core/plugins/PluginView.h"
+#include "platform/heap/HeapAllocator.h"
 #include "platform/weborigin/SecurityOrigin.h"
 
 namespace blink {
@@ -54,9 +55,10 @@
   return set;
 }
 
-static FrameViewBaseSet& WidgetsPendingDispose() {
-  DEFINE_STATIC_LOCAL(FrameViewBaseSet, set, (new FrameViewBaseSet));
-  return set;
+using FrameOrPluginList = HeapVector<Member<FrameOrPlugin>>;
+static FrameOrPluginList& FrameOrPluginsPendingDispose() {
+  DEFINE_STATIC_LOCAL(FrameOrPluginList, list, (new FrameOrPluginList));
+  return list;
 }
 
 SubframeLoadingDisabler::SubtreeRootSet&
@@ -100,10 +102,10 @@
   }
 
   {
-    FrameViewBaseSet set;
-    WidgetsPendingDispose().Swap(set);
-    for (const auto& frame_view_base : set) {
-      frame_view_base->Dispose();
+    FrameOrPluginList list;
+    FrameOrPluginsPendingDispose().Swap(list);
+    for (const auto& frame_or_plugin : list) {
+      frame_or_plugin->Dispose();
     }
   }
 }
@@ -115,7 +117,7 @@
   --g_update_suspend_count;
 }
 
-// Unlike moveWidgetToParentSoon, this will not call dispose the Widget.
+// Unlike moveWidgetToParentSoon, this will not call dispose.
 void TemporarilyRemoveWidgetFromParentSoon(FrameViewBase* frame_view_base) {
   if (g_update_suspend_count) {
     WidgetsPendingTemporaryRemovalFromParent().insert(frame_view_base);
@@ -215,12 +217,13 @@
   return content_frame_ && HTMLElement::IsKeyboardFocusable();
 }
 
-void HTMLFrameOwnerElement::DisposeWidgetSoon(FrameViewBase* frame_view_base) {
+void HTMLFrameOwnerElement::DisposeFrameOrPluginSoon(
+    FrameOrPlugin* frame_or_plugin) {
   if (g_update_suspend_count) {
-    WidgetsPendingDispose().insert(frame_view_base);
+    FrameOrPluginsPendingDispose().push_back(frame_or_plugin);
     return;
   }
-  frame_view_base->Dispose();
+  frame_or_plugin->Dispose();
 }
 
 void HTMLFrameOwnerElement::FrameOwnerPropertiesChanged() {
diff --git a/third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.h b/third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.h
index 2bda3b5..2cd3ff21 100644
--- a/third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.h
@@ -34,6 +34,7 @@
 
 class ExceptionState;
 class Frame;
+class FrameOrPlugin;
 class FrameViewBase;
 class LayoutPart;
 
@@ -105,7 +106,7 @@
                               bool replace_current_item);
   bool IsKeyboardFocusable() const override;
 
-  void DisposeWidgetSoon(FrameViewBase*);
+  void DisposeFrameOrPluginSoon(FrameOrPlugin*);
   void FrameOwnerPropertiesChanged();
 
  private:
diff --git a/third_party/WebKit/Source/core/html/HTMLPlugInElement.cpp b/third_party/WebKit/Source/core/html/HTMLPlugInElement.cpp
index 43fe90a..3665ea9f 100644
--- a/third_party/WebKit/Source/core/html/HTMLPlugInElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLPlugInElement.cpp
@@ -104,7 +104,7 @@
   // Remove and dispose the old plugin if we had one.
   if (plugin_) {
     GetDocument().View()->RemovePlugin(plugin_);
-    DisposeWidgetSoon(plugin_);
+    DisposeFrameOrPluginSoon(plugin_);
   }
   plugin_ = plugin;
 
@@ -150,7 +150,7 @@
     return;
   if (persisted_plugin_) {
     persisted_plugin_->Hide();
-    DisposeWidgetSoon(persisted_plugin_.Release());
+    DisposeFrameOrPluginSoon(persisted_plugin_.Release());
   }
   persisted_plugin_ = plugin;
 }
diff --git a/third_party/WebKit/Source/core/layout/LayoutEmbeddedObject.cpp b/third_party/WebKit/Source/core/layout/LayoutEmbeddedObject.cpp
index e19d346..54cc890 100644
--- a/third_party/WebKit/Source/core/layout/LayoutEmbeddedObject.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutEmbeddedObject.cpp
@@ -138,8 +138,7 @@
 
   UpdateLayerTransformAfterLayout();
 
-  FrameViewBase* frame_view_base = this->PluginOrFrame();
-  if (!frame_view_base && GetFrameView())
+  if (!GetFrameOrPlugin() && GetFrameView())
     GetFrameView()->AddPartToUpdate(*this);
 
   ClearNeedsLayout();
diff --git a/third_party/WebKit/Source/core/layout/LayoutPart.cpp b/third_party/WebKit/Source/core/layout/LayoutPart.cpp
index 4beb5b0..5d63160 100644
--- a/third_party/WebKit/Source/core/layout/LayoutPart.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutPart.cpp
@@ -25,8 +25,10 @@
 #include "core/layout/LayoutPart.h"
 
 #include "core/dom/AXObjectCache.h"
+#include "core/frame/FrameOrPlugin.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/RemoteFrameView.h"
 #include "core/html/HTMLFrameElementBase.h"
 #include "core/html/HTMLPlugInElement.h"
 #include "core/layout/HitTestResult.h"
@@ -108,14 +110,21 @@
                                            : nullptr;
 }
 
-FrameViewBase* LayoutPart::PluginOrFrame() const {
-  FrameViewBase* result = nullptr;
+FrameOrPlugin* LayoutPart::GetFrameOrPlugin() const {
   Node* node = GetNode();
-  if (node && node->IsFrameOwnerElement())
-    result = ToHTMLFrameOwnerElement(node)->OwnedWidget();
-  if (!result)
-    result = Plugin();
-  return result;
+  if (node && node->IsFrameOwnerElement()) {
+    FrameViewBase* frame_view_base =
+        ToHTMLFrameOwnerElement(node)->OwnedWidget();
+    if (frame_view_base) {
+      if (frame_view_base->IsFrameView())
+        return ToFrameView(frame_view_base);
+      if (frame_view_base->IsRemoteFrameView())
+        return ToRemoteFrameView(frame_view_base);
+      // Must be either FrameView or RemoteFrameView.
+      NOTREACHED();
+    }
+  }
+  return Plugin();
 }
 
 PaintLayerType LayoutPart::LayerTypeRequired() const {
@@ -259,18 +268,18 @@
 void LayoutPart::StyleDidChange(StyleDifference diff,
                                 const ComputedStyle* old_style) {
   LayoutReplaced::StyleDidChange(diff, old_style);
-  FrameViewBase* frame_view_base = this->PluginOrFrame();
-  if (!frame_view_base)
+  FrameOrPlugin* frame_or_plugin = GetFrameOrPlugin();
+  if (!frame_or_plugin)
     return;
 
   // If the iframe has custom scrollbars, recalculate their style.
-  if (frame_view_base->IsFrameView())
-    ToFrameView(frame_view_base)->RecalculateCustomScrollbarStyle();
+  if (FrameView* frame_view = ChildFrameView())
+    frame_view->RecalculateCustomScrollbarStyle();
 
   if (Style()->Visibility() != EVisibility::kVisible) {
-    frame_view_base->Hide();
+    frame_or_plugin->Hide();
   } else {
-    frame_view_base->Show();
+    frame_or_plugin->Show();
   }
 }
 
@@ -312,20 +321,20 @@
 }
 
 void LayoutPart::UpdateOnWidgetChange() {
-  FrameViewBase* frame_view_base = this->PluginOrFrame();
-  if (!frame_view_base)
+  FrameOrPlugin* frame_or_plugin = GetFrameOrPlugin();
+  if (!frame_or_plugin)
     return;
 
   if (!Style())
     return;
 
   if (!NeedsLayout())
-    UpdateGeometryInternal(*frame_view_base);
+    UpdateGeometryInternal(*frame_or_plugin);
 
   if (Style()->Visibility() != EVisibility::kVisible) {
-    frame_view_base->Hide();
+    frame_or_plugin->Hide();
   } else {
-    frame_view_base->Show();
+    frame_or_plugin->Show();
     // FIXME: Why do we issue a full paint invalidation in this case, but not
     // the other?
     SetShouldDoFullPaintInvalidation();
@@ -333,40 +342,38 @@
 }
 
 void LayoutPart::UpdateGeometry() {
-  FrameViewBase* frame_view_base = this->PluginOrFrame();
-  if (!frame_view_base ||
-      !GetNode())  // Check the node in case destroy() has been called.
+  FrameOrPlugin* frame_or_plugin = GetFrameOrPlugin();
+  if (!frame_or_plugin)
     return;
 
   LayoutRect new_frame = ReplacedContentRect();
   DCHECK(new_frame.Size() == RoundedIntSize(new_frame.Size()));
   bool bounds_will_change =
-      LayoutSize(frame_view_base->FrameRect().Size()) != new_frame.Size();
-
-  FrameView* frame_view =
-      frame_view_base->IsFrameView() ? ToFrameView(frame_view_base) : nullptr;
+      LayoutSize(frame_or_plugin->FrameRect().Size()) != new_frame.Size();
 
   // If frame bounds are changing mark the view for layout. Also check the
   // frame's page to make sure that the frame isn't in the process of being
   // destroyed. If iframe scrollbars needs reconstruction from native to custom
   // scrollbar, then also we need to layout the frameview.
+  FrameView* frame_view = ChildFrameView();
   if (frame_view && frame_view->GetFrame().GetPage() &&
       (bounds_will_change || frame_view->NeedsScrollbarReconstruction()))
     frame_view->SetNeedsLayout();
 
-  UpdateGeometryInternal(*frame_view_base);
+  UpdateGeometryInternal(*frame_or_plugin);
 
   // If view needs layout, either because bounds have changed or possibly
   // indicating content size is wrong, we have to do a layout to set the right
-  // FrameViewBase size.
+  // FrameView size.
   if (frame_view && frame_view->NeedsLayout() &&
       frame_view->GetFrame().GetPage())
     frame_view->UpdateLayout();
 
-  frame_view_base->GeometryMayHaveChanged();
+  if (PluginView* plugin = Plugin())
+    plugin->GeometryMayHaveChanged();
 }
 
-void LayoutPart::UpdateGeometryInternal(FrameViewBase& frame_view_base) {
+void LayoutPart::UpdateGeometryInternal(FrameOrPlugin& frame_or_plugin) {
   // Ignore transform here, as we only care about the sub-pixel accumulation.
   // TODO(trchen): What about multicol? Need a LayoutBox function to query
   // sub-pixel accumulation.
@@ -378,7 +385,7 @@
                      PixelSnappedIntRect(absolute_replaced_rect).Size());
   // Normally the location of the frame rect is ignored by the painter, but
   // currently it is still used by a family of coordinate conversion function in
-  // FrameViewBase/FrameView. This is incorrect because coordinate conversion
+  // FrameView. This is incorrect because coordinate conversion
   // needs to take transform and into account. A few callers still use the
   // family of conversion function, including but not exhaustive:
   // FrameView::updateViewportIntersectionIfNeeded()
@@ -391,7 +398,7 @@
 
   // Why is the protector needed?
   RefPtr<LayoutPart> protector(this);
-  frame_view_base.SetFrameRect(frame_rect);
+  frame_or_plugin.SetFrameRect(frame_rect);
 }
 
 void LayoutPart::InvalidatePaintOfSubtreesIfNeeded(
diff --git a/third_party/WebKit/Source/core/layout/LayoutPart.h b/third_party/WebKit/Source/core/layout/LayoutPart.h
index 0a42bcde..f34be6d 100644
--- a/third_party/WebKit/Source/core/layout/LayoutPart.h
+++ b/third_party/WebKit/Source/core/layout/LayoutPart.h
@@ -25,11 +25,12 @@
 
 #include "core/CoreExport.h"
 #include "core/layout/LayoutReplaced.h"
-#include "core/plugins/PluginView.h"
-#include "platform/FrameViewBase.h"
 
 namespace blink {
 
+class FrameOrPlugin;
+class PluginView;
+
 // LayoutObject for frames via LayoutFrame and LayoutIFrame, and plugins via
 // LayoutEmbeddedObject.
 class CORE_EXPORT LayoutPart : public LayoutReplaced {
@@ -55,7 +56,7 @@
   // the FrameView associated with the root Document Frame.
   FrameView* ChildFrameView() const;
   PluginView* Plugin() const;
-  FrameViewBase* PluginOrFrame() const;
+  FrameOrPlugin* GetFrameOrPlugin() const;
 
   LayoutRect ReplacedContentRect() const final;
 
@@ -80,7 +81,7 @@
       const PaintInvalidationState&) override;
 
  private:
-  void UpdateGeometryInternal(FrameViewBase&);
+  void UpdateGeometryInternal(FrameOrPlugin&);
   CompositingReasons AdditionalCompositingReasons() const override;
 
   void WillBeDestroyed() final;
diff --git a/third_party/WebKit/Source/core/paint/PartPainter.cpp b/third_party/WebKit/Source/core/paint/PartPainter.cpp
index 3f0cb335..5ecacd1 100644
--- a/third_party/WebKit/Source/core/paint/PartPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/PartPainter.cpp
@@ -4,6 +4,7 @@
 
 #include "core/paint/PartPainter.h"
 
+#include "core/frame/FrameOrPlugin.h"
 #include "core/layout/LayoutPart.h"
 #include "core/paint/BoxPainter.h"
 #include "core/paint/LayoutObjectDrawingRecorder.h"
@@ -69,7 +70,7 @@
   if (paint_info.phase != kPaintPhaseForeground)
     return;
 
-  if (layout_part_.PluginOrFrame()) {
+  if (layout_part_.GetFrameOrPlugin()) {
     // TODO(schenney) crbug.com/93805 Speculative release assert to verify that
     // the crashes we see in FrameViewBase painting are due to a destroyed
     // LayoutPart object.
@@ -119,25 +120,24 @@
                                 const LayoutPoint& paint_offset) {
   LayoutPoint adjusted_paint_offset = paint_offset + layout_part_.Location();
 
-  FrameViewBase* frame_view_base = layout_part_.PluginOrFrame();
-  CHECK(frame_view_base);
+  FrameOrPlugin* frame_or_plugin = layout_part_.GetFrameOrPlugin();
+  CHECK(frame_or_plugin);
 
   IntPoint paint_location(RoundedIntPoint(
       adjusted_paint_offset + layout_part_.ReplacedContentRect().Location()));
 
-  // FrameViewBases don't support painting with a paint offset, but instead
-  // offset themselves using the frame rect location. To paint FrameViewBases at
+  // Views don't support painting with a paint offset, but instead
+  // offset themselves using the frame rect location. To paint Views at
   // our desired location, we need to apply paint offset as a transform, with
   // the frame rect neutralized.
-  IntSize frame_view_base_paint_offset =
-      paint_location - frame_view_base->FrameRect().Location();
+  IntSize view_paint_offset =
+      paint_location - frame_or_plugin->FrameRect().Location();
   TransformRecorder transform(
       paint_info.context, layout_part_,
-      AffineTransform::Translation(frame_view_base_paint_offset.Width(),
-                                   frame_view_base_paint_offset.Height()));
-  CullRect adjusted_cull_rect(paint_info.GetCullRect(),
-                              -frame_view_base_paint_offset);
-  frame_view_base->Paint(paint_info.context, adjusted_cull_rect);
+      AffineTransform::Translation(view_paint_offset.Width(),
+                                   view_paint_offset.Height()));
+  CullRect adjusted_cull_rect(paint_info.GetCullRect(), -view_paint_offset);
+  frame_or_plugin->Paint(paint_info.context, adjusted_cull_rect);
 }
 
 }  // namespace blink
diff --git a/third_party/WebKit/Source/core/plugins/PluginView.h b/third_party/WebKit/Source/core/plugins/PluginView.h
index 5def9f9..e5ee0b3 100644
--- a/third_party/WebKit/Source/core/plugins/PluginView.h
+++ b/third_party/WebKit/Source/core/plugins/PluginView.h
@@ -29,24 +29,36 @@
 #define PluginView_h
 
 #include "core/CoreExport.h"
-#include "platform/FrameViewBase.h"
+#include "core/frame/FrameOrPlugin.h"
+#include "platform/geometry/IntRect.h"
 #include "platform/scroll/ScrollTypes.h"
 #include "platform/wtf/text/WTFString.h"
 #include "public/platform/WebFocusType.h"
 #include "v8/include/v8.h"
 
 namespace blink {
-class WebLayer;
-}
 
-namespace blink {
-
+class Event;
+class FrameView;
 class ResourceResponse;
+class WebLayer;
 
-class CORE_EXPORT PluginView : public FrameViewBase {
+// TODO(joelhockey): Remove this class.
+// The only implementation of this class is web/WebPluginContainerImpl.
+// It can be used directly.
+class CORE_EXPORT PluginView : public FrameOrPlugin {
  public:
-  bool IsPluginView() const final { return true; }
-  virtual void SetFocused(bool, WebFocusType) {}
+  virtual ~PluginView() {}
+
+  virtual void SetParent(FrameView*) = 0;
+  virtual FrameView* Parent() const = 0;
+  virtual void SetParentVisible(bool) = 0;
+  virtual void SetFocused(bool, WebFocusType) = 0;
+  virtual void FrameRectsChanged() = 0;
+  virtual void GeometryMayHaveChanged() = 0;
+  virtual void HandleEvent(Event*) = 0;
+  virtual void EventListenersRemoved() = 0;
+  virtual bool IsPluginContainer() const { return false; }
 
   virtual WebLayer* PlatformLayer() const { return 0; }
   virtual v8::Local<v8::Object> ScriptableObject(v8::Isolate*) {
@@ -62,17 +74,8 @@
 
   virtual void UpdateAllLifecyclePhases() {}
   virtual void InvalidatePaintIfNeeded() {}
-
- protected:
-  PluginView() : FrameViewBase() {}
 };
 
-DEFINE_TYPE_CASTS(PluginView,
-                  FrameViewBase,
-                  frameViewBase,
-                  frameViewBase->IsPluginView(),
-                  frameViewBase.IsPluginView());
-
 }  // namespace blink
 
 #endif  // PluginView_h
diff --git a/third_party/WebKit/Source/core/style/NinePieceImage.cpp b/third_party/WebKit/Source/core/style/NinePieceImage.cpp
index c9bd3de..a185d94 100644
--- a/third_party/WebKit/Source/core/style/NinePieceImage.cpp
+++ b/third_party/WebKit/Source/core/style/NinePieceImage.cpp
@@ -69,16 +69,6 @@
              Length(0, kFixed),
              Length(0, kFixed)) {}
 
-NinePieceImageData::NinePieceImageData(const NinePieceImageData& other)
-    : RefCounted<NinePieceImageData>(),
-      fill(other.fill),
-      horizontal_rule(other.horizontal_rule),
-      vertical_rule(other.vertical_rule),
-      image(other.image),
-      image_slices(other.image_slices),
-      border_slices(other.border_slices),
-      outset(other.outset) {}
-
 bool NinePieceImageData::operator==(const NinePieceImageData& other) const {
   return DataEquivalent(image, other.image) &&
          image_slices == other.image_slices && fill == other.fill &&
diff --git a/third_party/WebKit/Source/core/style/NinePieceImage.h b/third_party/WebKit/Source/core/style/NinePieceImage.h
index c2ca7819..0e876f3 100644
--- a/third_party/WebKit/Source/core/style/NinePieceImage.h
+++ b/third_party/WebKit/Source/core/style/NinePieceImage.h
@@ -43,7 +43,8 @@
   kRepeatImageRule
 };
 
-class CORE_EXPORT NinePieceImageData : public RefCounted<NinePieceImageData> {
+class CORE_EXPORT NinePieceImageData
+    : public RefCountedCopyable<NinePieceImageData> {
  public:
   static PassRefPtr<NinePieceImageData> Create() {
     return AdoptRef(new NinePieceImageData);
@@ -65,7 +66,7 @@
 
  private:
   NinePieceImageData();
-  NinePieceImageData(const NinePieceImageData&);
+  NinePieceImageData(const NinePieceImageData&) = default;
 };
 
 class CORE_EXPORT NinePieceImage {
diff --git a/third_party/WebKit/Source/core/testing/DummyModulator.cpp b/third_party/WebKit/Source/core/testing/DummyModulator.cpp
index 80f5d08c..3fbc977 100644
--- a/third_party/WebKit/Source/core/testing/DummyModulator.cpp
+++ b/third_party/WebKit/Source/core/testing/DummyModulator.cpp
@@ -36,6 +36,24 @@
   return nullptr;
 };
 
+void DummyModulator::FetchTree(const ModuleScriptFetchRequest&,
+                               ModuleTreeClient*) {
+  NOTREACHED();
+}
+
+void DummyModulator::FetchTreeInternal(const ModuleScriptFetchRequest&,
+                                       const AncestorList&,
+                                       ModuleGraphLevel,
+                                       ModuleTreeClient*) {
+  NOTREACHED();
+};
+
+void DummyModulator::FetchSingle(const ModuleScriptFetchRequest&,
+                                 ModuleGraphLevel,
+                                 SingleModuleClient*) {
+  NOTREACHED();
+}
+
 ModuleScript* DummyModulator::GetFetchedModuleScript(const KURL&) {
   NOTREACHED();
   return nullptr;
diff --git a/third_party/WebKit/Source/core/testing/DummyModulator.h b/third_party/WebKit/Source/core/testing/DummyModulator.h
index 4e7d749..efd617a 100644
--- a/third_party/WebKit/Source/core/testing/DummyModulator.h
+++ b/third_party/WebKit/Source/core/testing/DummyModulator.h
@@ -36,6 +36,14 @@
   ReferrerPolicy GetReferrerPolicy() override;
   SecurityOrigin* GetSecurityOrigin() override;
 
+  void FetchTree(const ModuleScriptFetchRequest&, ModuleTreeClient*) override;
+  void FetchTreeInternal(const ModuleScriptFetchRequest&,
+                         const AncestorList&,
+                         ModuleGraphLevel,
+                         ModuleTreeClient*) override;
+  void FetchSingle(const ModuleScriptFetchRequest&,
+                   ModuleGraphLevel,
+                   SingleModuleClient*) override;
   ModuleScript* GetFetchedModuleScript(const KURL&) override;
   void FetchNewSingleModule(const ModuleScriptFetchRequest&,
                             ModuleGraphLevel,
diff --git a/third_party/WebKit/Source/core/testing/WorkerInternals.cpp b/third_party/WebKit/Source/core/testing/WorkerInternals.cpp
index 42ee5394..afc509ca9 100644
--- a/third_party/WebKit/Source/core/testing/WorkerInternals.cpp
+++ b/third_party/WebKit/Source/core/testing/WorkerInternals.cpp
@@ -4,6 +4,7 @@
 
 #include "core/testing/WorkerInternals.h"
 
+#include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/frame/Deprecation.h"
@@ -21,13 +22,25 @@
 }
 
 void WorkerInternals::countFeature(ScriptState* script_state,
-                                   uint32_t feature) {
+                                   uint32_t feature,
+                                   ExceptionState& exception_state) {
+  if (UseCounter::kNumberOfFeatures <= feature) {
+    exception_state.ThrowTypeError(
+        "The given feature does not exist in UseCounter::Feature.");
+    return;
+  }
   UseCounter::Count(ExecutionContext::From(script_state),
                     static_cast<UseCounter::Feature>(feature));
 }
 
 void WorkerInternals::countDeprecation(ScriptState* script_state,
-                                       uint32_t feature) {
+                                       uint32_t feature,
+                                       ExceptionState& exception_state) {
+  if (UseCounter::kNumberOfFeatures <= feature) {
+    exception_state.ThrowTypeError(
+        "The given feature does not exist in UseCounter::Feature.");
+    return;
+  }
   Deprecation::CountDeprecation(ExecutionContext::From(script_state),
                                 static_cast<UseCounter::Feature>(feature));
 }
diff --git a/third_party/WebKit/Source/core/testing/WorkerInternals.h b/third_party/WebKit/Source/core/testing/WorkerInternals.h
index 185d4b8d..aa69b70 100644
--- a/third_party/WebKit/Source/core/testing/WorkerInternals.h
+++ b/third_party/WebKit/Source/core/testing/WorkerInternals.h
@@ -10,6 +10,7 @@
 
 namespace blink {
 
+class ExceptionState;
 class OriginTrialsTest;
 class ScriptState;
 
@@ -22,8 +23,8 @@
   virtual ~WorkerInternals();
 
   OriginTrialsTest* originTrialsTest() const;
-  void countFeature(ScriptState*, uint32_t feature);
-  void countDeprecation(ScriptState*, uint32_t feature);
+  void countFeature(ScriptState*, uint32_t feature, ExceptionState&);
+  void countDeprecation(ScriptState*, uint32_t feature, ExceptionState&);
 
   void collectGarbage(ScriptState*);
 
diff --git a/third_party/WebKit/Source/core/testing/WorkerInternals.idl b/third_party/WebKit/Source/core/testing/WorkerInternals.idl
index a49c02e..4f372e9 100644
--- a/third_party/WebKit/Source/core/testing/WorkerInternals.idl
+++ b/third_party/WebKit/Source/core/testing/WorkerInternals.idl
@@ -7,8 +7,8 @@
 
     // Records |feature| in worker's use counter. |feature| must be one of the
     // values from the UseCounter::Feature enum.
-    [CallWith=ScriptState] void countFeature(unsigned long feature);
-    [CallWith=ScriptState] void countDeprecation(unsigned long feature);
+    [CallWith=ScriptState, RaisesException] void countFeature(unsigned long feature);
+    [CallWith=ScriptState, RaisesException] void countDeprecation(unsigned long feature);
 
     [CallWith=ScriptState] void collectGarbage();
 };
diff --git a/third_party/WebKit/Source/core/workers/BUILD.gn b/third_party/WebKit/Source/core/workers/BUILD.gn
index 89d3a7de..d273a5c 100644
--- a/third_party/WebKit/Source/core/workers/BUILD.gn
+++ b/third_party/WebKit/Source/core/workers/BUILD.gn
@@ -22,6 +22,8 @@
     "InProcessWorkerMessagingProxy.h",
     "InProcessWorkerObjectProxy.cpp",
     "InProcessWorkerObjectProxy.h",
+    "MainThreadWorklet.cpp",
+    "MainThreadWorklet.h",
     "MainThreadWorkletGlobalScope.cpp",
     "MainThreadWorkletGlobalScope.h",
     "ParentFrameTaskRunners.cpp",
@@ -37,6 +39,8 @@
     "ThreadedMessagingProxyBase.h",
     "ThreadedObjectProxyBase.cpp",
     "ThreadedObjectProxyBase.h",
+    "ThreadedWorklet.cpp",
+    "ThreadedWorklet.h",
     "ThreadedWorkletGlobalScope.cpp",
     "ThreadedWorkletGlobalScope.h",
     "ThreadedWorkletMessagingProxy.cpp",
diff --git a/third_party/WebKit/Source/core/workers/MainThreadWorklet.cpp b/third_party/WebKit/Source/core/workers/MainThreadWorklet.cpp
new file mode 100644
index 0000000..d58013c
--- /dev/null
+++ b/third_party/WebKit/Source/core/workers/MainThreadWorklet.cpp
@@ -0,0 +1,78 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/workers/MainThreadWorklet.h"
+
+#include "bindings/core/v8/ScriptSourceCode.h"
+#include "bindings/core/v8/V8Binding.h"
+#include "core/dom/DOMException.h"
+#include "core/dom/Document.h"
+#include "core/dom/ExceptionCode.h"
+#include "core/frame/LocalFrame.h"
+#include "core/workers/WorkletGlobalScopeProxy.h"
+#include "platform/wtf/WTF.h"
+
+namespace blink {
+
+MainThreadWorklet::MainThreadWorklet(LocalFrame* frame) : Worklet(frame) {}
+
+ScriptPromise MainThreadWorklet::import(ScriptState* script_state,
+                                        const String& url) {
+  DCHECK(IsMainThread());
+  if (!GetExecutionContext()) {
+    return ScriptPromise::RejectWithDOMException(
+        script_state, DOMException::Create(kInvalidStateError,
+                                           "This frame is already detached"));
+  }
+
+  KURL script_url = GetExecutionContext()->CompleteURL(url);
+  if (!script_url.IsValid()) {
+    return ScriptPromise::RejectWithDOMException(
+        script_state, DOMException::Create(
+                          kSyntaxError, "'" + url + "' is not a valid URL."));
+  }
+
+  if (!IsInitialized())
+    Initialize();
+
+  ScriptPromiseResolver* resolver = ScriptPromiseResolver::Create(script_state);
+  ScriptPromise promise = resolver->Promise();
+
+  WorkletScriptLoader* script_loader =
+      WorkletScriptLoader::Create(frame_->GetDocument()->Fetcher(), this);
+  loader_to_resolver_map_.Set(script_loader, resolver);
+  script_loader->FetchScript(script_url);
+  return promise;
+}
+
+void MainThreadWorklet::NotifyWorkletScriptLoadingFinished(
+    WorkletScriptLoader* script_loader,
+    const ScriptSourceCode& source_code) {
+  DCHECK(IsMainThread());
+  ScriptPromiseResolver* resolver = loader_to_resolver_map_.at(script_loader);
+  loader_to_resolver_map_.erase(script_loader);
+
+  if (!script_loader->WasScriptLoadSuccessful()) {
+    resolver->Reject(DOMException::Create(kNetworkError));
+    return;
+  }
+
+  GetWorkletGlobalScopeProxy()->EvaluateScript(source_code);
+  resolver->Resolve();
+}
+
+void MainThreadWorklet::ContextDestroyed(ExecutionContext* execution_context) {
+  DCHECK(IsMainThread());
+  for (const auto& script_loader : loader_to_resolver_map_.Keys())
+    script_loader->Cancel();
+  loader_to_resolver_map_.Clear();
+  Worklet::ContextDestroyed(execution_context);
+}
+
+DEFINE_TRACE(MainThreadWorklet) {
+  visitor->Trace(loader_to_resolver_map_);
+  Worklet::Trace(visitor);
+}
+
+}  // namespace blink
diff --git a/third_party/WebKit/Source/core/workers/MainThreadWorklet.h b/third_party/WebKit/Source/core/workers/MainThreadWorklet.h
new file mode 100644
index 0000000..858d1e9
--- /dev/null
+++ b/third_party/WebKit/Source/core/workers/MainThreadWorklet.h
@@ -0,0 +1,53 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MainThreadWorklet_h
+#define MainThreadWorklet_h
+
+#include "core/workers/Worklet.h"
+
+#include "bindings/core/v8/ScriptPromiseResolver.h"
+#include "core/CoreExport.h"
+#include "core/loader/WorkletScriptLoader.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class LocalFrame;
+
+// A MainThreadWorklet is a worklet that runs only on the main thread.
+// TODO(nhiroki): This is a temporary class to support module loading for main
+// thread worklets. This and ThreadedWorklet will be merged into the base
+// Worklet class once threaded worklets are ready to use module loading.
+class CORE_EXPORT MainThreadWorklet : public Worklet,
+                                      public WorkletScriptLoader::Client {
+  USING_GARBAGE_COLLECTED_MIXIN(MainThreadWorklet);
+  WTF_MAKE_NONCOPYABLE(MainThreadWorklet);
+
+ public:
+  virtual ~MainThreadWorklet() = default;
+
+  // Worklet
+  ScriptPromise import(ScriptState*, const String& url) final;
+
+  // WorkletScriptLoader::Client
+  void NotifyWorkletScriptLoadingFinished(WorkletScriptLoader*,
+                                          const ScriptSourceCode&) final;
+
+  // ContextLifecycleObserver
+  void ContextDestroyed(ExecutionContext*) final;
+
+  DECLARE_VIRTUAL_TRACE();
+
+ protected:
+  explicit MainThreadWorklet(LocalFrame*);
+
+ private:
+  HeapHashMap<Member<WorkletScriptLoader>, Member<ScriptPromiseResolver>>
+      loader_to_resolver_map_;
+};
+
+}  // namespace blink
+
+#endif  // MainThreadWorklet_h
diff --git a/third_party/WebKit/Source/core/workers/ThreadedWorklet.cpp b/third_party/WebKit/Source/core/workers/ThreadedWorklet.cpp
new file mode 100644
index 0000000..d60cded
--- /dev/null
+++ b/third_party/WebKit/Source/core/workers/ThreadedWorklet.cpp
@@ -0,0 +1,78 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/workers/ThreadedWorklet.h"
+
+#include "bindings/core/v8/ScriptSourceCode.h"
+#include "bindings/core/v8/V8Binding.h"
+#include "core/dom/DOMException.h"
+#include "core/dom/Document.h"
+#include "core/dom/ExceptionCode.h"
+#include "core/frame/LocalFrame.h"
+#include "core/workers/WorkletGlobalScopeProxy.h"
+#include "platform/wtf/WTF.h"
+
+namespace blink {
+
+ThreadedWorklet::ThreadedWorklet(LocalFrame* frame) : Worklet(frame) {}
+
+ScriptPromise ThreadedWorklet::import(ScriptState* script_state,
+                                      const String& url) {
+  DCHECK(IsMainThread());
+  if (!GetExecutionContext()) {
+    return ScriptPromise::RejectWithDOMException(
+        script_state, DOMException::Create(kInvalidStateError,
+                                           "This frame is already detached"));
+  }
+
+  KURL script_url = GetExecutionContext()->CompleteURL(url);
+  if (!script_url.IsValid()) {
+    return ScriptPromise::RejectWithDOMException(
+        script_state, DOMException::Create(
+                          kSyntaxError, "'" + url + "' is not a valid URL."));
+  }
+
+  if (!IsInitialized())
+    Initialize();
+
+  ScriptPromiseResolver* resolver = ScriptPromiseResolver::Create(script_state);
+  ScriptPromise promise = resolver->Promise();
+
+  WorkletScriptLoader* script_loader =
+      WorkletScriptLoader::Create(frame_->GetDocument()->Fetcher(), this);
+  loader_to_resolver_map_.Set(script_loader, resolver);
+  script_loader->FetchScript(script_url);
+  return promise;
+}
+
+void ThreadedWorklet::NotifyWorkletScriptLoadingFinished(
+    WorkletScriptLoader* script_loader,
+    const ScriptSourceCode& source_code) {
+  DCHECK(IsMainThread());
+  ScriptPromiseResolver* resolver = loader_to_resolver_map_.at(script_loader);
+  loader_to_resolver_map_.erase(script_loader);
+
+  if (!script_loader->WasScriptLoadSuccessful()) {
+    resolver->Reject(DOMException::Create(kNetworkError));
+    return;
+  }
+
+  GetWorkletGlobalScopeProxy()->EvaluateScript(source_code);
+  resolver->Resolve();
+}
+
+void ThreadedWorklet::ContextDestroyed(ExecutionContext* execution_context) {
+  DCHECK(IsMainThread());
+  for (const auto& script_loader : loader_to_resolver_map_.Keys())
+    script_loader->Cancel();
+  loader_to_resolver_map_.Clear();
+  Worklet::ContextDestroyed(execution_context);
+}
+
+DEFINE_TRACE(ThreadedWorklet) {
+  visitor->Trace(loader_to_resolver_map_);
+  Worklet::Trace(visitor);
+}
+
+}  // namespace blink
diff --git a/third_party/WebKit/Source/core/workers/ThreadedWorklet.h b/third_party/WebKit/Source/core/workers/ThreadedWorklet.h
new file mode 100644
index 0000000..24155c8
--- /dev/null
+++ b/third_party/WebKit/Source/core/workers/ThreadedWorklet.h
@@ -0,0 +1,54 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ThreadedWorklet_h
+#define ThreadedWorklet_h
+
+#include "core/workers/Worklet.h"
+
+#include "bindings/core/v8/ScriptPromiseResolver.h"
+#include "core/CoreExport.h"
+#include "core/loader/WorkletScriptLoader.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class LocalFrame;
+
+// A ThreadedWorklet is a worklet that runs off the main thread.
+// TODO(nhiroki): This is a temporary class to keep classic script loading for
+// threaded worklets while module loading is being implemented for main thread
+// worklets. This and MainThreadWorklet will be merged into the base Worklet
+// class once threaded worklets are also ready to use module loading.
+class CORE_EXPORT ThreadedWorklet : public Worklet,
+                                    public WorkletScriptLoader::Client {
+  USING_GARBAGE_COLLECTED_MIXIN(ThreadedWorklet);
+  WTF_MAKE_NONCOPYABLE(ThreadedWorklet);
+
+ public:
+  virtual ~ThreadedWorklet() = default;
+
+  // Worklet
+  ScriptPromise import(ScriptState*, const String& url) final;
+
+  // WorkletScriptLoader::Client
+  void NotifyWorkletScriptLoadingFinished(WorkletScriptLoader*,
+                                          const ScriptSourceCode&) final;
+
+  // ContextLifecycleObserver
+  void ContextDestroyed(ExecutionContext*) final;
+
+  DECLARE_VIRTUAL_TRACE();
+
+ protected:
+  explicit ThreadedWorklet(LocalFrame*);
+
+ private:
+  HeapHashMap<Member<WorkletScriptLoader>, Member<ScriptPromiseResolver>>
+      loader_to_resolver_map_;
+};
+
+}  // namespace blink
+
+#endif  // ThreadedWorklet_h
diff --git a/third_party/WebKit/Source/core/workers/Worklet.cpp b/third_party/WebKit/Source/core/workers/Worklet.cpp
index a5f9e2a9..1e6c274 100644
--- a/third_party/WebKit/Source/core/workers/Worklet.cpp
+++ b/third_party/WebKit/Source/core/workers/Worklet.cpp
@@ -4,77 +4,27 @@
 
 #include "core/workers/Worklet.h"
 
-#include "bindings/core/v8/ScriptSourceCode.h"
-#include "bindings/core/v8/V8Binding.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
-#include "core/dom/ExceptionCode.h"
 #include "core/frame/LocalFrame.h"
 #include "core/workers/WorkletGlobalScopeProxy.h"
-#include "platform/wtf/WTF.h"
 
 namespace blink {
 
 Worklet::Worklet(LocalFrame* frame)
-    : ContextLifecycleObserver(frame->GetDocument()), frame_(frame) {}
-
-ScriptPromise Worklet::import(ScriptState* script_state, const String& url) {
+    : ContextLifecycleObserver(frame->GetDocument()), frame_(frame) {
   DCHECK(IsMainThread());
-  if (!GetExecutionContext()) {
-    return ScriptPromise::RejectWithDOMException(
-        script_state, DOMException::Create(kInvalidStateError,
-                                           "This frame is already detached"));
-  }
-
-  KURL script_url = GetExecutionContext()->CompleteURL(url);
-  if (!script_url.IsValid()) {
-    return ScriptPromise::RejectWithDOMException(
-        script_state, DOMException::Create(
-                          kSyntaxError, "'" + url + "' is not a valid URL."));
-  }
-
-  if (!IsInitialized())
-    Initialize();
-
-  ScriptPromiseResolver* resolver = ScriptPromiseResolver::Create(script_state);
-  ScriptPromise promise = resolver->Promise();
-
-  WorkletScriptLoader* script_loader =
-      WorkletScriptLoader::Create(frame_->GetDocument()->Fetcher(), this);
-  loader_and_resolvers_.Set(script_loader, resolver);
-  script_loader->FetchScript(script_url);
-  return promise;
-}
-
-void Worklet::NotifyWorkletScriptLoadingFinished(
-    WorkletScriptLoader* script_loader,
-    const ScriptSourceCode& source_code) {
-  DCHECK(IsMainThread());
-  ScriptPromiseResolver* resolver = loader_and_resolvers_.at(script_loader);
-  loader_and_resolvers_.erase(script_loader);
-
-  if (!script_loader->WasScriptLoadSuccessful()) {
-    resolver->Reject(DOMException::Create(kNetworkError));
-    return;
-  }
-
-  GetWorkletGlobalScopeProxy()->EvaluateScript(source_code);
-  resolver->Resolve();
 }
 
 void Worklet::ContextDestroyed(ExecutionContext*) {
   DCHECK(IsMainThread());
   if (IsInitialized())
     GetWorkletGlobalScopeProxy()->TerminateWorkletGlobalScope();
-  for (const auto& script_loader : loader_and_resolvers_.Keys())
-    script_loader->Cancel();
-  loader_and_resolvers_.Clear();
   frame_ = nullptr;
 }
 
 DEFINE_TRACE(Worklet) {
   visitor->Trace(frame_);
-  visitor->Trace(loader_and_resolvers_);
   ContextLifecycleObserver::Trace(visitor);
 }
 
diff --git a/third_party/WebKit/Source/core/workers/Worklet.h b/third_party/WebKit/Source/core/workers/Worklet.h
index 6d44e30..f482229f 100644
--- a/third_party/WebKit/Source/core/workers/Worklet.h
+++ b/third_party/WebKit/Source/core/workers/Worklet.h
@@ -6,21 +6,21 @@
 #define Worklet_h
 
 #include "bindings/core/v8/ScriptPromise.h"
-#include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "core/dom/ContextLifecycleObserver.h"
-#include "core/loader/WorkletScriptLoader.h"
 #include "platform/heap/Handle.h"
-#include "platform/loader/fetch/ResourceFetcher.h"
 
 namespace blink {
 
 class LocalFrame;
 class WorkletGlobalScopeProxy;
 
+// This is the base implementation of Worklet interface defined in the spec:
+// https://drafts.css-houdini.org/worklets/#worklet
+// Although some worklets run off the main thread, this must be created and
+// destroyed on the main thread.
 class CORE_EXPORT Worklet : public GarbageCollectedFinalized<Worklet>,
-                            public WorkletScriptLoader::Client,
                             public ScriptWrappable,
                             public ContextLifecycleObserver {
   DEFINE_WRAPPERTYPEINFO();
@@ -33,17 +33,15 @@
   virtual void Initialize() {}
   virtual bool IsInitialized() const { return true; }
 
+  // Worklet.idl
+  // import() imports ES6 module scripts.
+  virtual ScriptPromise import(ScriptState*, const String& url) = 0;
+
+  // Returns a proxy to WorkletGlobalScope on the context thread.
   virtual WorkletGlobalScopeProxy* GetWorkletGlobalScopeProxy() const = 0;
 
-  // Worklet
-  ScriptPromise import(ScriptState*, const String& url);
-
-  // WorkletScriptLoader::Client
-  void NotifyWorkletScriptLoadingFinished(WorkletScriptLoader*,
-                                          const ScriptSourceCode&) final;
-
   // ContextLifecycleObserver
-  void ContextDestroyed(ExecutionContext*) final;
+  virtual void ContextDestroyed(ExecutionContext*);
 
   DECLARE_VIRTUAL_TRACE();
 
@@ -51,10 +49,7 @@
   // The Worklet inherits the url and userAgent from the frame->document().
   explicit Worklet(LocalFrame*);
 
- private:
   Member<LocalFrame> frame_;
-  HeapHashMap<Member<WorkletScriptLoader>, Member<ScriptPromiseResolver>>
-      loader_and_resolvers_;
 };
 
 }  // namespace blink
diff --git a/third_party/WebKit/Source/devtools/front_end/elements/module.json b/third_party/WebKit/Source/devtools/front_end/elements/module.json
index 11b7c4d..684632f 100644
--- a/third_party/WebKit/Source/devtools/front_end/elements/module.json
+++ b/third_party/WebKit/Source/devtools/front_end/elements/module.json
@@ -219,6 +219,7 @@
         {
             "type": "@UI.ViewLocationResolver",
             "name": "elements-sidebar",
+            "category": "Elements",
             "className": "Elements.ElementsPanel"
         },
         {
diff --git a/third_party/WebKit/Source/devtools/front_end/main/module.json b/third_party/WebKit/Source/devtools/front_end/main/module.json
index 61d3623..9e5a909 100644
--- a/third_party/WebKit/Source/devtools/front_end/main/module.json
+++ b/third_party/WebKit/Source/devtools/front_end/main/module.json
@@ -413,6 +413,13 @@
         {
             "type": "@UI.ViewLocationResolver",
             "name": "drawer-view",
+            "category": "Drawer",
+            "className": "UI.InspectorView"
+        },
+        {
+            "type": "@UI.ViewLocationResolver",
+            "name": "panel",
+            "category": "Panel",
             "className": "UI.InspectorView"
         },
         {
diff --git a/third_party/WebKit/Source/devtools/front_end/quick_open/CommandMenu.js b/third_party/WebKit/Source/devtools/front_end/quick_open/CommandMenu.js
index 0ca09d3..90b98ea 100644
--- a/third_party/WebKit/Source/devtools/front_end/quick_open/CommandMenu.js
+++ b/third_party/WebKit/Source/devtools/front_end/quick_open/CommandMenu.js
@@ -59,35 +59,30 @@
 
   /**
    * @param {!Runtime.Extension} extension
+   * @param {string} category
    * @return {!QuickOpen.CommandMenu.Command}
    */
-  static createRevealPanelCommand(extension) {
-    var panelId = extension.descriptor()['id'];
-    var executeHandler = UI.viewManager.showView.bind(UI.viewManager, panelId);
+  static createRevealViewCommand(extension, category) {
+    var viewId = extension.descriptor()['id'];
+    var executeHandler = UI.viewManager.showView.bind(UI.viewManager, viewId);
     var tags = extension.descriptor()['tags'] || '';
     return QuickOpen.CommandMenu.createCommand(
-        Common.UIString('Panel'), tags, Common.UIString('Show %s', extension.title()), '', executeHandler);
-  }
-
-  /**
-   * @param {!Runtime.Extension} extension
-   * @return {!QuickOpen.CommandMenu.Command}
-   */
-  static createRevealDrawerCommand(extension) {
-    var drawerId = extension.descriptor()['id'];
-    var executeHandler = UI.viewManager.showView.bind(UI.viewManager, drawerId);
-    var tags = extension.descriptor()['tags'] || '';
-    return QuickOpen.CommandMenu.createCommand(
-        Common.UIString('Drawer'), tags, Common.UIString('Show %s', extension.title()), '', executeHandler);
+        category, tags, Common.UIString('Show %s', extension.title()), '', executeHandler);
   }
 
   _loadCommands() {
+    var locations = new Map();
+    self.runtime.extensions(UI.ViewLocationResolver).forEach(extension => {
+      var category = extension.descriptor()['category'];
+      var name = extension.descriptor()['name'];
+      if (category && name)
+        locations.set(name, category);
+    });
     var viewExtensions = self.runtime.extensions('view');
     for (var extension of viewExtensions) {
-      if (extension.descriptor()['location'] === 'panel')
-        this._commands.push(QuickOpen.CommandMenu.createRevealPanelCommand(extension));
-      else if (extension.descriptor()['location'] === 'drawer-view')
-        this._commands.push(QuickOpen.CommandMenu.createRevealDrawerCommand(extension));
+      var category = locations.get(extension.descriptor()['location']);
+      if (category)
+        this._commands.push(QuickOpen.CommandMenu.createRevealViewCommand(extension, category));
     }
 
     // Populate whitelisted settings.
diff --git a/third_party/WebKit/Source/devtools/front_end/settings/module.json b/third_party/WebKit/Source/devtools/front_end/settings/module.json
index 50d0233..f73e1ba 100644
--- a/third_party/WebKit/Source/devtools/front_end/settings/module.json
+++ b/third_party/WebKit/Source/devtools/front_end/settings/module.json
@@ -79,6 +79,7 @@
         {
             "type": "@UI.ViewLocationResolver",
             "name": "settings-view",
+            "category": "Settings",
             "className": "Settings.SettingsScreen"
         }
     ],
diff --git a/third_party/WebKit/Source/devtools/front_end/sources/JavaScriptSourceFrame.js b/third_party/WebKit/Source/devtools/front_end/sources/JavaScriptSourceFrame.js
index de2ac73..86fd83ac 100644
--- a/third_party/WebKit/Source/devtools/front_end/sources/JavaScriptSourceFrame.js
+++ b/third_party/WebKit/Source/devtools/front_end/sources/JavaScriptSourceFrame.js
@@ -1253,7 +1253,7 @@
     if (this._prettyPrintInfobar)
       return;
 
-    if (!TextUtils.isMinified(/** @type {string} */ (this._debuggerSourceCode.content())))
+    if (!TextUtils.isMinified(/** @type {string} */ (this.uiSourceCode().content())))
       return;
 
     this._prettyPrintInfobar = UI.Infobar.create(
diff --git a/third_party/WebKit/Source/devtools/front_end/sources/module.json b/third_party/WebKit/Source/devtools/front_end/sources/module.json
index 0795eb1..8a9d43c 100644
--- a/third_party/WebKit/Source/devtools/front_end/sources/module.json
+++ b/third_party/WebKit/Source/devtools/front_end/sources/module.json
@@ -503,6 +503,7 @@
         {
             "type": "@UI.ViewLocationResolver",
             "name": "sources-sidebar",
+            "category": "Sources",
             "className": "Sources.SourcesPanel"
         },
         {
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/InspectorView.js b/third_party/WebKit/Source/devtools/front_end/ui/InspectorView.js
index 077d6c9a..fc8cf5f 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/InspectorView.js
+++ b/third_party/WebKit/Source/devtools/front_end/ui/InspectorView.js
@@ -111,7 +111,11 @@
    * @return {?UI.ViewLocation}
    */
   resolveLocation(locationName) {
-    return this._drawerTabbedLocation;
+    if (locationName === 'drawer-view')
+      return this._drawerTabbedLocation;
+    if (locationName === 'panel')
+      return this._tabbedLocation;
+    return null;
   }
 
   createToolbars() {
diff --git a/third_party/WebKit/Source/modules/compositorworker/AnimationWorklet.cpp b/third_party/WebKit/Source/modules/compositorworker/AnimationWorklet.cpp
index dded2c3..6f85765 100644
--- a/third_party/WebKit/Source/modules/compositorworker/AnimationWorklet.cpp
+++ b/third_party/WebKit/Source/modules/compositorworker/AnimationWorklet.cpp
@@ -20,7 +20,7 @@
 }
 
 AnimationWorklet::AnimationWorklet(LocalFrame* frame)
-    : Worklet(frame), worklet_messaging_proxy_(nullptr) {}
+    : ThreadedWorklet(frame), worklet_messaging_proxy_(nullptr) {}
 
 AnimationWorklet::~AnimationWorklet() {
   if (worklet_messaging_proxy_)
@@ -52,7 +52,7 @@
 }
 
 DEFINE_TRACE(AnimationWorklet) {
-  Worklet::Trace(visitor);
+  ThreadedWorklet::Trace(visitor);
 }
 
 }  // namespace blink
diff --git a/third_party/WebKit/Source/modules/compositorworker/AnimationWorklet.h b/third_party/WebKit/Source/modules/compositorworker/AnimationWorklet.h
index b83e567b..7fb42f4 100644
--- a/third_party/WebKit/Source/modules/compositorworker/AnimationWorklet.h
+++ b/third_party/WebKit/Source/modules/compositorworker/AnimationWorklet.h
@@ -5,7 +5,7 @@
 #ifndef AnimationWorklet_h
 #define AnimationWorklet_h
 
-#include "core/workers/Worklet.h"
+#include "core/workers/ThreadedWorklet.h"
 #include "modules/ModulesExport.h"
 #include "platform/heap/Handle.h"
 
@@ -15,7 +15,7 @@
 class ThreadedWorkletMessagingProxy;
 class WorkletGlobalScopeProxy;
 
-class MODULES_EXPORT AnimationWorklet final : public Worklet {
+class MODULES_EXPORT AnimationWorklet final : public ThreadedWorklet {
   WTF_MAKE_NONCOPYABLE(AnimationWorklet);
 
  public:
diff --git a/third_party/WebKit/Source/modules/csspaint/PaintWorklet.cpp b/third_party/WebKit/Source/modules/csspaint/PaintWorklet.cpp
index 71c5f98..56cb710 100644
--- a/third_party/WebKit/Source/modules/csspaint/PaintWorklet.cpp
+++ b/third_party/WebKit/Source/modules/csspaint/PaintWorklet.cpp
@@ -17,7 +17,7 @@
 }
 
 PaintWorklet::PaintWorklet(LocalFrame* frame)
-    : Worklet(frame),
+    : MainThreadWorklet(frame),
       paint_worklet_global_scope_(PaintWorkletGlobalScope::Create(
           frame,
           frame->GetDocument()->Url(),
@@ -42,7 +42,7 @@
 
 DEFINE_TRACE(PaintWorklet) {
   visitor->Trace(paint_worklet_global_scope_);
-  Worklet::Trace(visitor);
+  MainThreadWorklet::Trace(visitor);
 }
 
 }  // namespace blink
diff --git a/third_party/WebKit/Source/modules/csspaint/PaintWorklet.h b/third_party/WebKit/Source/modules/csspaint/PaintWorklet.h
index 31cc827..762df33 100644
--- a/third_party/WebKit/Source/modules/csspaint/PaintWorklet.h
+++ b/third_party/WebKit/Source/modules/csspaint/PaintWorklet.h
@@ -5,7 +5,7 @@
 #ifndef PaintWorklet_h
 #define PaintWorklet_h
 
-#include "core/workers/Worklet.h"
+#include "core/workers/MainThreadWorklet.h"
 #include "modules/ModulesExport.h"
 #include "modules/csspaint/PaintWorkletGlobalScope.h"
 #include "platform/heap/Handle.h"
@@ -15,7 +15,7 @@
 class CSSPaintDefinition;
 class CSSPaintImageGeneratorImpl;
 
-class MODULES_EXPORT PaintWorklet final : public Worklet {
+class MODULES_EXPORT PaintWorklet final : public MainThreadWorklet {
   WTF_MAKE_NONCOPYABLE(PaintWorklet);
 
  public:
diff --git a/third_party/WebKit/Source/modules/gamepad/BUILD.gn b/third_party/WebKit/Source/modules/gamepad/BUILD.gn
index 4062bd6..027b327d 100644
--- a/third_party/WebKit/Source/modules/gamepad/BUILD.gn
+++ b/third_party/WebKit/Source/modules/gamepad/BUILD.gn
@@ -21,4 +21,8 @@
     "NavigatorGamepad.cpp",
     "NavigatorGamepad.h",
   ]
+
+  deps = [
+    "//device/gamepad/public/cpp:shared_with_blink",
+  ]
 }
diff --git a/third_party/WebKit/Source/modules/gamepad/DEPS b/third_party/WebKit/Source/modules/gamepad/DEPS
index c54ef3e..c1ba0f0 100644
--- a/third_party/WebKit/Source/modules/gamepad/DEPS
+++ b/third_party/WebKit/Source/modules/gamepad/DEPS
@@ -1,4 +1,9 @@
 include_rules = [
+    # NOTE: These files are POD structs used to interpret shared memory across
+    # the Device Gamepad implementation and the Blink client.
+    "+device/gamepad/public/cpp/gamepad.h",
+    "+device/gamepad/public/cpp/gamepads.h",
+
     "-modules",
     "+modules/EventModules.h",
     "+modules/ModulesExport.h",
diff --git a/third_party/WebKit/Source/modules/gamepad/Gamepad.cpp b/third_party/WebKit/Source/modules/gamepad/Gamepad.cpp
index f7772a9..efaba77b 100644
--- a/third_party/WebKit/Source/modules/gamepad/Gamepad.cpp
+++ b/third_party/WebKit/Source/modules/gamepad/Gamepad.cpp
@@ -37,7 +37,7 @@
     std::copy(data, data + count, axes_.begin());
 }
 
-void Gamepad::SetButtons(unsigned count, const WebGamepadButton* data) {
+void Gamepad::SetButtons(unsigned count, const device::GamepadButton* data) {
   if (buttons_.size() != count) {
     buttons_.Resize(count);
     for (unsigned i = 0; i < count; ++i)
@@ -51,7 +51,7 @@
   }
 }
 
-void Gamepad::SetPose(const WebGamepadPose& pose) {
+void Gamepad::SetPose(const device::GamepadPose& pose) {
   if (!pose.not_null) {
     if (pose_)
       pose_ = nullptr;
@@ -64,15 +64,15 @@
   pose_->SetPose(pose);
 }
 
-void Gamepad::SetHand(const WebGamepadHand& hand) {
+void Gamepad::SetHand(const device::GamepadHand& hand) {
   switch (hand) {
-    case kGamepadHandNone:
+    case device::GamepadHand::kNone:
       hand_ = "";
       break;
-    case kGamepadHandLeft:
+    case device::GamepadHand::kLeft:
       hand_ = "left";
       break;
-    case kGamepadHandRight:
+    case device::GamepadHand::kRight:
       hand_ = "right";
       break;
     default:
diff --git a/third_party/WebKit/Source/modules/gamepad/Gamepad.h b/third_party/WebKit/Source/modules/gamepad/Gamepad.h
index 623d06e..0b18959 100644
--- a/third_party/WebKit/Source/modules/gamepad/Gamepad.h
+++ b/third_party/WebKit/Source/modules/gamepad/Gamepad.h
@@ -27,12 +27,12 @@
 #define Gamepad_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
+#include "device/gamepad/public/cpp/gamepad.h"
 #include "modules/gamepad/GamepadButton.h"
 #include "modules/gamepad/GamepadPose.h"
 #include "platform/heap/Handle.h"
 #include "platform/wtf/Vector.h"
 #include "platform/wtf/text/WTFString.h"
-#include "public/platform/WebGamepad.h"
 
 namespace blink {
 
@@ -65,13 +65,13 @@
   void SetAxes(unsigned count, const double* data);
 
   const GamepadButtonVector& buttons() const { return buttons_; }
-  void SetButtons(unsigned count, const WebGamepadButton* data);
+  void SetButtons(unsigned count, const device::GamepadButton* data);
 
   GamepadPose* pose() const { return pose_; }
-  void SetPose(const WebGamepadPose&);
+  void SetPose(const device::GamepadPose&);
 
   const String& hand() const { return hand_; }
-  void SetHand(const WebGamepadHand&);
+  void SetHand(const device::GamepadHand&);
 
   unsigned displayId() const { return display_id_; }
   void SetDisplayId(unsigned val) { display_id_ = val; }
diff --git a/third_party/WebKit/Source/modules/gamepad/GamepadDispatcher.cpp b/third_party/WebKit/Source/modules/gamepad/GamepadDispatcher.cpp
index 43e00db..c888a09 100644
--- a/third_party/WebKit/Source/modules/gamepad/GamepadDispatcher.cpp
+++ b/third_party/WebKit/Source/modules/gamepad/GamepadDispatcher.cpp
@@ -15,7 +15,7 @@
   return gamepad_dispatcher;
 }
 
-void GamepadDispatcher::SampleGamepads(WebGamepads& gamepads) {
+void GamepadDispatcher::SampleGamepads(device::Gamepads& gamepads) {
   Platform::Current()->SampleGamepads(gamepads);
 }
 
@@ -28,21 +28,21 @@
 }
 
 void GamepadDispatcher::DidConnectGamepad(unsigned index,
-                                          const WebGamepad& gamepad) {
+                                          const device::Gamepad& gamepad) {
   DispatchDidConnectOrDisconnectGamepad(index, gamepad, true);
 }
 
 void GamepadDispatcher::DidDisconnectGamepad(unsigned index,
-                                             const WebGamepad& gamepad) {
+                                             const device::Gamepad& gamepad) {
   DispatchDidConnectOrDisconnectGamepad(index, gamepad, false);
 }
 
 void GamepadDispatcher::DispatchDidConnectOrDisconnectGamepad(
     unsigned index,
-    const WebGamepad& gamepad,
+    const device::Gamepad& gamepad,
     bool connected) {
-  ASSERT(index < WebGamepads::kItemsLengthCap);
-  ASSERT(connected == gamepad.connected);
+  DCHECK(index < device::Gamepads::kItemsLengthCap);
+  DCHECK_EQ(connected, gamepad.connected);
 
   latest_change_.pad = gamepad;
   latest_change_.index = index;
diff --git a/third_party/WebKit/Source/modules/gamepad/GamepadDispatcher.h b/third_party/WebKit/Source/modules/gamepad/GamepadDispatcher.h
index df09160..3311e1d 100644
--- a/third_party/WebKit/Source/modules/gamepad/GamepadDispatcher.h
+++ b/third_party/WebKit/Source/modules/gamepad/GamepadDispatcher.h
@@ -6,14 +6,12 @@
 #define GamepadDispatcher_h
 
 #include "core/frame/PlatformEventDispatcher.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 #include "platform/heap/Handle.h"
-#include "public/platform/WebGamepad.h"
 #include "public/platform/WebGamepadListener.h"
 
 namespace blink {
 
-class WebGamepads;
-
 class GamepadDispatcher final
     : public GarbageCollectedFinalized<GamepadDispatcher>,
       public PlatformEventDispatcher,
@@ -24,11 +22,11 @@
   static GamepadDispatcher& Instance();
   ~GamepadDispatcher() override;
 
-  void SampleGamepads(WebGamepads&);
+  void SampleGamepads(device::Gamepads&);
 
   struct ConnectionChange {
     DISALLOW_NEW();
-    WebGamepad pad;
+    device::Gamepad pad;
     unsigned index;
   };
 
@@ -42,15 +40,15 @@
   GamepadDispatcher();
 
   // WebGamepadListener
-  void DidConnectGamepad(unsigned index, const WebGamepad&) override;
-  void DidDisconnectGamepad(unsigned index, const WebGamepad&) override;
+  void DidConnectGamepad(unsigned index, const device::Gamepad&) override;
+  void DidDisconnectGamepad(unsigned index, const device::Gamepad&) override;
 
   // PlatformEventDispatcher
   void StartListening() override;
   void StopListening() override;
 
   void DispatchDidConnectOrDisconnectGamepad(unsigned index,
-                                             const WebGamepad&,
+                                             const device::Gamepad&,
                                              bool connected);
 
   ConnectionChange latest_change_;
diff --git a/third_party/WebKit/Source/modules/gamepad/GamepadList.cpp b/third_party/WebKit/Source/modules/gamepad/GamepadList.cpp
index 732b60a4..5e35828 100644
--- a/third_party/WebKit/Source/modules/gamepad/GamepadList.cpp
+++ b/third_party/WebKit/Source/modules/gamepad/GamepadList.cpp
@@ -30,7 +30,7 @@
 GamepadList::GamepadList() {}
 
 void GamepadList::Set(unsigned index, Gamepad* gamepad) {
-  if (index >= WebGamepads::kItemsLengthCap)
+  if (index >= device::Gamepads::kItemsLengthCap)
     return;
   items_[index] = gamepad;
 }
@@ -40,7 +40,7 @@
 }
 
 DEFINE_TRACE(GamepadList) {
-  for (unsigned index = 0; index < WebGamepads::kItemsLengthCap; index++) {
+  for (unsigned index = 0; index < device::Gamepads::kItemsLengthCap; index++) {
     visitor->Trace(items_[index]);
   }
 }
diff --git a/third_party/WebKit/Source/modules/gamepad/GamepadList.h b/third_party/WebKit/Source/modules/gamepad/GamepadList.h
index df484683..31e4f7e2 100644
--- a/third_party/WebKit/Source/modules/gamepad/GamepadList.h
+++ b/third_party/WebKit/Source/modules/gamepad/GamepadList.h
@@ -27,9 +27,9 @@
 #define GamepadList_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 #include "modules/gamepad/Gamepad.h"
 #include "platform/heap/Handle.h"
-#include "public/platform/WebGamepads.h"
 
 namespace blink {
 
@@ -42,13 +42,13 @@
 
   void Set(unsigned index, Gamepad*);
   Gamepad* item(unsigned index);
-  unsigned length() const { return WebGamepads::kItemsLengthCap; }
+  unsigned length() const { return device::Gamepads::kItemsLengthCap; }
 
   DECLARE_TRACE();
 
  private:
   GamepadList();
-  Member<Gamepad> items_[WebGamepads::kItemsLengthCap];
+  Member<Gamepad> items_[device::Gamepads::kItemsLengthCap];
 };
 
 }  // namespace blink
diff --git a/third_party/WebKit/Source/modules/gamepad/GamepadPose.cpp b/third_party/WebKit/Source/modules/gamepad/GamepadPose.cpp
index 1be92d52..f8c211d 100644
--- a/third_party/WebKit/Source/modules/gamepad/GamepadPose.cpp
+++ b/third_party/WebKit/Source/modules/gamepad/GamepadPose.cpp
@@ -8,7 +8,7 @@
 
 namespace {
 
-DOMFloat32Array* VecToFloat32Array(const WebGamepadVector& vec) {
+DOMFloat32Array* VecToFloat32Array(const device::GamepadVector& vec) {
   if (vec.not_null) {
     DOMFloat32Array* out = DOMFloat32Array::Create(3);
     out->Data()[0] = vec.x;
@@ -19,7 +19,7 @@
   return nullptr;
 }
 
-DOMFloat32Array* QuatToFloat32Array(const WebGamepadQuaternion& quat) {
+DOMFloat32Array* QuatToFloat32Array(const device::GamepadQuaternion& quat) {
   if (quat.not_null) {
     DOMFloat32Array* out = DOMFloat32Array::Create(4);
     out->Data()[0] = quat.x;
@@ -35,7 +35,7 @@
 
 GamepadPose::GamepadPose() {}
 
-void GamepadPose::SetPose(const WebGamepadPose& state) {
+void GamepadPose::SetPose(const device::GamepadPose& state) {
   if (state.not_null) {
     has_orientation_ = state.has_orientation;
     has_position_ = state.has_position;
diff --git a/third_party/WebKit/Source/modules/gamepad/GamepadPose.h b/third_party/WebKit/Source/modules/gamepad/GamepadPose.h
index e40b4d0..9f48783c 100644
--- a/third_party/WebKit/Source/modules/gamepad/GamepadPose.h
+++ b/third_party/WebKit/Source/modules/gamepad/GamepadPose.h
@@ -7,9 +7,9 @@
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/dom/DOMTypedArray.h"
+#include "device/gamepad/public/cpp/gamepad.h"
 #include "platform/heap/Handle.h"
 #include "platform/wtf/Forward.h"
-#include "public/platform/WebGamepad.h"
 
 namespace blink {
 
@@ -30,7 +30,7 @@
   DOMFloat32Array* angularAcceleration() const { return angular_acceleration_; }
   DOMFloat32Array* linearAcceleration() const { return linear_acceleration_; }
 
-  void SetPose(const WebGamepadPose& state);
+  void SetPose(const device::GamepadPose& state);
 
   DECLARE_VIRTUAL_TRACE();
 
diff --git a/third_party/WebKit/Source/modules/gamepad/NavigatorGamepad.cpp b/third_party/WebKit/Source/modules/gamepad/NavigatorGamepad.cpp
index abcd9e8..023b2d42 100644
--- a/third_party/WebKit/Source/modules/gamepad/NavigatorGamepad.cpp
+++ b/third_party/WebKit/Source/modules/gamepad/NavigatorGamepad.cpp
@@ -29,6 +29,7 @@
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Navigator.h"
 #include "core/page/Page.h"
+#include "device/gamepad/public/cpp/gamepad.h"
 #include "modules/gamepad/GamepadDispatcher.h"
 #include "modules/gamepad/GamepadEvent.h"
 #include "modules/gamepad/GamepadList.h"
@@ -38,27 +39,27 @@
 template <typename T>
 static void SampleGamepad(unsigned index,
                           T& gamepad,
-                          const WebGamepad& web_gamepad) {
-  gamepad.SetId(web_gamepad.id);
+                          const device::Gamepad& device_gamepad) {
+  gamepad.SetId(device_gamepad.id);
   gamepad.SetIndex(index);
-  gamepad.SetConnected(web_gamepad.connected);
-  gamepad.SetTimestamp(web_gamepad.timestamp);
-  gamepad.SetMapping(web_gamepad.mapping);
-  gamepad.SetAxes(web_gamepad.axes_length, web_gamepad.axes);
-  gamepad.SetButtons(web_gamepad.buttons_length, web_gamepad.buttons);
-  gamepad.SetPose(web_gamepad.pose);
-  gamepad.SetHand(web_gamepad.hand);
-  gamepad.SetDisplayId(web_gamepad.display_id);
+  gamepad.SetConnected(device_gamepad.connected);
+  gamepad.SetTimestamp(device_gamepad.timestamp);
+  gamepad.SetMapping(device_gamepad.mapping);
+  gamepad.SetAxes(device_gamepad.axes_length, device_gamepad.axes);
+  gamepad.SetButtons(device_gamepad.buttons_length, device_gamepad.buttons);
+  gamepad.SetPose(device_gamepad.pose);
+  gamepad.SetHand(device_gamepad.hand);
+  gamepad.SetDisplayId(device_gamepad.display_id);
 }
 
 template <typename GamepadType, typename ListType>
 static void SampleGamepads(ListType* into) {
-  WebGamepads gamepads;
+  device::Gamepads gamepads;
 
   GamepadDispatcher::Instance().SampleGamepads(gamepads);
 
-  for (unsigned i = 0; i < WebGamepads::kItemsLengthCap; ++i) {
-    WebGamepad& web_gamepad = gamepads.items[i];
+  for (unsigned i = 0; i < device::Gamepads::kItemsLengthCap; ++i) {
+    device::Gamepad& web_gamepad = gamepads.items[i];
     if (web_gamepad.connected) {
       GamepadType* gamepad = into->item(i);
       if (!gamepad)
@@ -254,7 +255,7 @@
   GamepadList* new_gamepads = gamepads_.Get();
   DCHECK(new_gamepads);
 
-  for (unsigned i = 0; i < WebGamepads::kItemsLengthCap; ++i) {
+  for (unsigned i = 0; i < device::Gamepads::kItemsLengthCap; ++i) {
     Gamepad* old_gamepad = old_gamepads ? old_gamepads->item(i) : 0;
     Gamepad* new_gamepad = new_gamepads->item(i);
     bool old_was_connected = old_gamepad && old_gamepad->connected();
diff --git a/third_party/WebKit/Source/modules/gamepad/NavigatorGamepad.h b/third_party/WebKit/Source/modules/gamepad/NavigatorGamepad.h
index fece750..cd4e2eac 100644
--- a/third_party/WebKit/Source/modules/gamepad/NavigatorGamepad.h
+++ b/third_party/WebKit/Source/modules/gamepad/NavigatorGamepad.h
@@ -30,11 +30,11 @@
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/Navigator.h"
 #include "core/frame/PlatformEventController.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 #include "modules/ModulesExport.h"
 #include "platform/AsyncMethodRunner.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
-#include "public/platform/WebGamepads.h"
 
 namespace blink {
 
@@ -62,7 +62,7 @@
   DECLARE_VIRTUAL_TRACE();
 
   void DidConnectOrDisconnectGamepad(unsigned index,
-                                     const WebGamepad&,
+                                     const device::Gamepad&,
                                      bool connected);
 
  private:
diff --git a/third_party/WebKit/Source/modules/webaudio/AudioWorklet.cpp b/third_party/WebKit/Source/modules/webaudio/AudioWorklet.cpp
index 0d8ade7..39e341d1 100644
--- a/third_party/WebKit/Source/modules/webaudio/AudioWorklet.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/AudioWorklet.cpp
@@ -17,7 +17,7 @@
 }
 
 AudioWorklet::AudioWorklet(LocalFrame* frame)
-    : Worklet(frame), worklet_messaging_proxy_(nullptr) {}
+    : ThreadedWorklet(frame), worklet_messaging_proxy_(nullptr) {}
 
 AudioWorklet::~AudioWorklet() {
   if (worklet_messaging_proxy_)
@@ -45,7 +45,7 @@
 }
 
 DEFINE_TRACE(AudioWorklet) {
-  Worklet::Trace(visitor);
+  ThreadedWorklet::Trace(visitor);
 }
 
 }  // namespace blink
diff --git a/third_party/WebKit/Source/modules/webaudio/AudioWorklet.h b/third_party/WebKit/Source/modules/webaudio/AudioWorklet.h
index 8aee6a10..71ddc90f 100644
--- a/third_party/WebKit/Source/modules/webaudio/AudioWorklet.h
+++ b/third_party/WebKit/Source/modules/webaudio/AudioWorklet.h
@@ -5,7 +5,7 @@
 #ifndef AudioWorklet_h
 #define AudioWorklet_h
 
-#include "core/workers/Worklet.h"
+#include "core/workers/ThreadedWorklet.h"
 #include "modules/ModulesExport.h"
 #include "platform/heap/Handle.h"
 
@@ -15,7 +15,7 @@
 class ThreadedWorkletMessagingProxy;
 class WorkletGlobalScopeProxy;
 
-class MODULES_EXPORT AudioWorklet final : public Worklet {
+class MODULES_EXPORT AudioWorklet final : public ThreadedWorklet {
   WTF_MAKE_NONCOPYABLE(AudioWorklet);
 
  public:
diff --git a/third_party/WebKit/Source/platform/FrameViewBase.h b/third_party/WebKit/Source/platform/FrameViewBase.h
index b80aaa1..58ac1d9 100644
--- a/third_party/WebKit/Source/platform/FrameViewBase.h
+++ b/third_party/WebKit/Source/platform/FrameViewBase.h
@@ -36,9 +36,7 @@
 
 namespace blink {
 
-class CullRect;
 class Event;
-class GraphicsContext;
 
 // The FrameViewBase class serves as a base class for FrameView, Scrollbar, and
 // PluginView.
@@ -63,17 +61,10 @@
     frame_rect_ = frame_rect;
   }
   const IntRect& FrameRect() const { return frame_rect_; }
-  IntRect BoundsRect() const { return IntRect(0, 0, Width(), Height()); }
 
   void Resize(int w, int h) { SetFrameRect(IntRect(X(), Y(), w, h)); }
   void Resize(const IntSize& s) { SetFrameRect(IntRect(Location(), s)); }
 
-  virtual void Paint(GraphicsContext&, const CullRect&) const {}
-  void Invalidate() { InvalidateRect(BoundsRect()); }
-  virtual void InvalidateRect(const IntRect&) = 0;
-
-  virtual void Show() {}
-  virtual void Hide() {}
   bool IsSelfVisible() const {
     return self_visible_;
   }  // Whether or not we have been explicitly marked as visible or not.
diff --git a/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5 b/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5
index d4e77ffd..18cde98 100644
--- a/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5
+++ b/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5
@@ -177,7 +177,7 @@
     },
     {
       name: "ContextMenu",
-      status: "test",
+      status: "experimental",
     },
     {
       name: "CorsRFC1918",
diff --git a/third_party/WebKit/Source/platform/loader/fetch/FetchUtils.cpp b/third_party/WebKit/Source/platform/loader/fetch/FetchUtils.cpp
index a4d5e4c..f9bc710 100644
--- a/third_party/WebKit/Source/platform/loader/fetch/FetchUtils.cpp
+++ b/third_party/WebKit/Source/platform/loader/fetch/FetchUtils.cpp
@@ -95,16 +95,16 @@
   // Treat inspector headers as a simple headers, since they are added by blink
   // when the inspector is open.
 
-  if (DeprecatedEqualIgnoringCase(name, "accept") ||
-      DeprecatedEqualIgnoringCase(name, "accept-language") ||
-      DeprecatedEqualIgnoringCase(name, "content-language") ||
-      DeprecatedEqualIgnoringCase(
+  if (EqualIgnoringASCIICase(name, "accept") ||
+      EqualIgnoringASCIICase(name, "accept-language") ||
+      EqualIgnoringASCIICase(name, "content-language") ||
+      EqualIgnoringASCIICase(
           name, HTTPNames::X_DevTools_Emulate_Network_Conditions_Client_Id) ||
-      DeprecatedEqualIgnoringCase(name, HTTPNames::X_DevTools_Request_Id) ||
-      DeprecatedEqualIgnoringCase(name, "save-data"))
+      EqualIgnoringASCIICase(name, HTTPNames::X_DevTools_Request_Id) ||
+      EqualIgnoringASCIICase(name, "save-data"))
     return true;
 
-  if (DeprecatedEqualIgnoringCase(name, "content-type"))
+  if (EqualIgnoringASCIICase(name, "content-type"))
     return IsSimpleContentType(value);
 
   return false;
@@ -112,10 +112,10 @@
 
 bool FetchUtils::IsSimpleContentType(const AtomicString& media_type) {
   AtomicString mime_type = ExtractMIMETypeFromMediaType(media_type);
-  return DeprecatedEqualIgnoringCase(mime_type,
-                                     "application/x-www-form-urlencoded") ||
-         DeprecatedEqualIgnoringCase(mime_type, "multipart/form-data") ||
-         DeprecatedEqualIgnoringCase(mime_type, "text/plain");
+  return EqualIgnoringASCIICase(mime_type,
+                                "application/x-www-form-urlencoded") ||
+         EqualIgnoringASCIICase(mime_type, "multipart/form-data") ||
+         EqualIgnoringASCIICase(mime_type, "text/plain");
 }
 
 bool FetchUtils::IsSimpleRequest(const String& method,
@@ -137,9 +137,9 @@
   // http://fetch.spec.whatwg.org/#forbidden-method
   // "A forbidden method is a method that is a byte case-insensitive match"
   //  for one of `CONNECT`, `TRACE`, and `TRACK`."
-  return DeprecatedEqualIgnoringCase(method, "TRACE") ||
-         DeprecatedEqualIgnoringCase(method, "TRACK") ||
-         DeprecatedEqualIgnoringCase(method, "CONNECT");
+  return EqualIgnoringASCIICase(method, "TRACE") ||
+         EqualIgnoringASCIICase(method, "TRACK") ||
+         EqualIgnoringASCIICase(method, "CONNECT");
 }
 
 bool FetchUtils::IsForbiddenHeaderName(const String& name) {
@@ -161,8 +161,8 @@
   // "A forbidden response header name is a header name that is one of:
   // `Set-Cookie`, `Set-Cookie2`"
 
-  return DeprecatedEqualIgnoringCase(name, "set-cookie") ||
-         DeprecatedEqualIgnoringCase(name, "set-cookie2");
+  return EqualIgnoringASCIICase(name, "set-cookie") ||
+         EqualIgnoringASCIICase(name, "set-cookie2");
 }
 
 bool FetchUtils::IsSimpleOrForbiddenRequest(const String& method,
@@ -189,7 +189,7 @@
   };
 
   for (const auto& known : kMethods) {
-    if (DeprecatedEqualIgnoringCase(method, known)) {
+    if (EqualIgnoringASCIICase(method, known)) {
       // Don't bother allocating a new string if it's already all
       // uppercase.
       return method == known ? method : known;
diff --git a/third_party/WebKit/Source/platform/scroll/Scrollbar.cpp b/third_party/WebKit/Source/platform/scroll/Scrollbar.cpp
index e794e1bc..c5a1386 100644
--- a/third_party/WebKit/Source/platform/scroll/Scrollbar.cpp
+++ b/third_party/WebKit/Source/platform/scroll/Scrollbar.cpp
@@ -158,8 +158,7 @@
   if (!cull_rect.IntersectsCullRect(FrameRect()))
     return;
 
-  if (!GetTheme().Paint(*this, context, cull_rect))
-    FrameViewBase::Paint(context, cull_rect);
+  GetTheme().Paint(*this, context, cull_rect);
 }
 
 void Scrollbar::AutoscrollTimerFired(TimerBase*) {
diff --git a/third_party/WebKit/Source/platform/scroll/Scrollbar.h b/third_party/WebKit/Source/platform/scroll/Scrollbar.h
index d74393e..0d492ef1 100644
--- a/third_party/WebKit/Source/platform/scroll/Scrollbar.h
+++ b/third_party/WebKit/Source/platform/scroll/Scrollbar.h
@@ -36,6 +36,7 @@
 
 namespace blink {
 
+class CullRect;
 class GraphicsContext;
 class HostWindow;
 class IntRect;
@@ -129,7 +130,7 @@
   void SetProportion(int visible_size, int total_size);
   void SetPressedPos(int p) { pressed_pos_ = p; }
 
-  void Paint(GraphicsContext&, const CullRect&) const final;
+  void Paint(GraphicsContext&, const CullRect&) const;
 
   bool IsOverlayScrollbar() const override;
   bool ShouldParticipateInHitTesting();
diff --git a/third_party/WebKit/Source/web/WebPluginContainerImpl.cpp b/third_party/WebKit/Source/web/WebPluginContainerImpl.cpp
index c5c5029..fcc8889 100644
--- a/third_party/WebKit/Source/web/WebPluginContainerImpl.cpp
+++ b/third_party/WebKit/Source/web/WebPluginContainerImpl.cpp
@@ -112,8 +112,13 @@
 
 // Public methods --------------------------------------------------------------
 
-void WebPluginContainerImpl::SetFrameRect(const IntRect& frame_rect) {
-  FrameViewBase::SetFrameRect(frame_rect);
+void WebPluginContainerImpl::SetParent(FrameView* parent) {
+  DCHECK(!parent || !parent_);
+  if (!parent || !parent->IsVisible())
+    SetParentVisible(false);
+  parent_ = parent;
+  if (parent && parent->IsVisible())
+    SetParentVisible(true);
 }
 
 void WebPluginContainerImpl::UpdateAllLifecyclePhases() {
@@ -125,19 +130,19 @@
 
 void WebPluginContainerImpl::Paint(GraphicsContext& context,
                                    const CullRect& cull_rect) const {
-  if (!Parent())
+  if (!parent_)
     return;
 
   // Don't paint anything if the plugin doesn't intersect.
-  if (!cull_rect.IntersectsCullRect(FrameRect()))
+  if (!cull_rect.IntersectsCullRect(frame_rect_))
     return;
 
   if (RuntimeEnabledFeatures::slimmingPaintV2Enabled() && web_layer_) {
     // With Slimming Paint v2, composited plugins should have their layers
     // inserted rather than invoking WebPlugin::paint.
     RecordForeignLayer(context, *element_->GetLayoutObject(),
-                       DisplayItem::kForeignLayerPlugin, web_layer_, Location(),
-                       Size());
+                       DisplayItem::kForeignLayerPlugin, web_layer_,
+                       frame_rect_.Location(), frame_rect_.Size());
     return;
   }
 
@@ -150,25 +155,22 @@
       cull_rect.rect_);
   context.Save();
 
-  DCHECK(Parent()->IsFrameView());
-  FrameView* view = ToFrameView(Parent());
-
   // The plugin is positioned in the root frame's coordinates, so it needs to
   // be painted in them too.
-  IntPoint origin = view->ContentsToRootFrame(IntPoint(0, 0));
+  IntPoint origin = parent_->ContentsToRootFrame(IntPoint(0, 0));
   context.Translate(static_cast<float>(-origin.X()),
                     static_cast<float>(-origin.Y()));
 
   WebCanvas* canvas = context.Canvas();
 
-  IntRect window_rect = view->ContentsToRootFrame(cull_rect.rect_);
+  IntRect window_rect = parent_->ContentsToRootFrame(cull_rect.rect_);
   web_plugin_->Paint(canvas, window_rect);
 
   context.Restore();
 }
 
 void WebPluginContainerImpl::InvalidateRect(const IntRect& rect) {
-  if (!Parent())
+  if (!parent_)
     return;
 
   LayoutBox* layout_object = ToLayoutBox(element_->GetLayoutObject());
@@ -190,17 +192,13 @@
 }
 
 void WebPluginContainerImpl::Show() {
-  SetSelfVisible(true);
+  self_visible_ = true;
   web_plugin_->UpdateVisibility(true);
-
-  FrameViewBase::Show();
 }
 
 void WebPluginContainerImpl::Hide() {
-  SetSelfVisible(false);
+  self_visible_ = false;
   web_plugin_->UpdateVisibility(false);
-
-  FrameViewBase::Hide();
 }
 
 void WebPluginContainerImpl::HandleEvent(Event* event) {
@@ -229,12 +227,10 @@
 }
 
 void WebPluginContainerImpl::FrameRectsChanged() {
-  FrameViewBase::FrameRectsChanged();
   ReportGeometry();
 }
 
 void WebPluginContainerImpl::GeometryMayHaveChanged() {
-  FrameViewBase::GeometryMayHaveChanged();
   ReportGeometry();
 }
 
@@ -251,15 +247,15 @@
   // is ignored. This function is called when the plugin eventually gets a
   // parent.
 
-  if (IsParentVisible() == parent_visible)
+  if (parent_visible_ == parent_visible)
     return;  // No change.
 
-  FrameViewBase::SetParentVisible(parent_visible);
-  if (!IsSelfVisible())
+  parent_visible_ = parent_visible;
+  if (!self_visible_)
     return;  // This widget has explicitely been marked as not visible.
 
   if (web_plugin_)
-    web_plugin_->UpdateVisibility(IsVisible());
+    web_plugin_->UpdateVisibility(parent_visible_ && self_visible_);
 }
 
 void WebPluginContainerImpl::SetPlugin(WebPlugin* plugin) {
@@ -413,7 +409,7 @@
 }
 
 void WebPluginContainerImpl::Invalidate() {
-  FrameViewBase::Invalidate();
+  InvalidateRect(IntRect(0, 0, frame_rect_.Width(), frame_rect_.Height()));
 }
 
 void WebPluginContainerImpl::InvalidateRect(const WebRect& rect) {
@@ -431,14 +427,14 @@
 
 void WebPluginContainerImpl::ReportGeometry() {
   // We cannot compute geometry without a parent or layoutObject.
-  if (!Parent() || !element_ || !element_->GetLayoutObject() || !web_plugin_)
+  if (!parent_ || !element_ || !element_->GetLayoutObject() || !web_plugin_)
     return;
 
   IntRect window_rect, clip_rect, unobscured_rect;
   Vector<IntRect> cut_out_rects;
   CalculateGeometry(window_rect, clip_rect, unobscured_rect, cut_out_rects);
   web_plugin_->UpdateGeometry(window_rect, clip_rect, unobscured_rect,
-                              cut_out_rects, IsVisible());
+                              cut_out_rects, self_visible_);
 }
 
 v8::Local<v8::Object> WebPluginContainerImpl::V8ObjectForElement() {
@@ -519,7 +515,8 @@
   if (!frame)
     return false;
 
-  IntRect document_rect(X() + rect.x, Y() + rect.y, rect.width, rect.height);
+  IntRect document_rect(frame_rect_.X() + rect.x, frame_rect_.Y() + rect.y,
+                        rect.width, rect.height);
   // hitTestResultAtPoint() takes a padding rectangle.
   // FIXME: We'll be off by 1 when the width or height is even.
   LayoutPoint center = document_rect.Center();
@@ -574,7 +571,7 @@
   if (Page* page = element_->GetDocument().GetPage()) {
     if (ScrollingCoordinator* scrolling_coordinator =
             page->GetScrollingCoordinator()) {
-      if (Parent() && Parent()->IsFrameView())
+      if (parent_)
         scrolling_coordinator->NotifyGeometryChanged();
     }
   }
@@ -582,23 +579,21 @@
 
 WebPoint WebPluginContainerImpl::RootFrameToLocalPoint(
     const WebPoint& point_in_root_frame) {
-  FrameView* view = ToFrameView(Parent());
-  if (!view)
+  if (!parent_)
     return point_in_root_frame;
-  WebPoint point_in_content = view->RootFrameToContents(point_in_root_frame);
+  WebPoint point_in_content = parent_->RootFrameToContents(point_in_root_frame);
   return RoundedIntPoint(element_->GetLayoutObject()->AbsoluteToLocal(
       FloatPoint(point_in_content), kUseTransforms));
 }
 
 WebPoint WebPluginContainerImpl::LocalToRootFramePoint(
     const WebPoint& point_in_local) {
-  FrameView* view = ToFrameView(Parent());
-  if (!view)
+  if (!parent_)
     return point_in_local;
   IntPoint absolute_point =
       RoundedIntPoint(element_->GetLayoutObject()->LocalToAbsolute(
           FloatPoint(point_in_local), kUseTransforms));
-  return view->ContentsToRootFrame(absolute_point);
+  return parent_->ContentsToRootFrame(absolute_point);
 }
 
 void WebPluginContainerImpl::DidReceiveResponse(
@@ -672,6 +667,8 @@
       web_layer_(nullptr),
       touch_event_request_type_(kTouchEventRequestTypeNone),
       wants_wheel_events_(false),
+      self_visible_(false),
+      parent_visible_(false),
       is_disposed_(false) {}
 
 WebPluginContainerImpl::~WebPluginContainerImpl() {
@@ -698,22 +695,21 @@
 }
 
 DEFINE_TRACE(WebPluginContainerImpl) {
+  visitor->Trace(parent_);
   visitor->Trace(element_);
   ContextClient::Trace(visitor);
   PluginView::Trace(visitor);
 }
 
 void WebPluginContainerImpl::HandleMouseEvent(MouseEvent* event) {
-  DCHECK(Parent()->IsFrameView());
-
   // We cache the parent FrameView here as the plugin widget could be deleted
   // in the call to HandleEvent. See http://b/issue?id=1362948
-  FrameView* parent_view = ToFrameView(Parent());
+  FrameView* parent_view = parent_;
 
   // TODO(dtapuska): Move WebMouseEventBuilder into the anonymous namespace
   // in this class.
   WebMouseEventBuilder transformed_event(
-      ToFrameView(Parent()), LayoutItem(element_->GetLayoutObject()), *event);
+      parent_, LayoutItem(element_->GetLayoutObject()), *event);
   if (transformed_event.GetType() == WebInputEvent::kUndefined)
     return;
 
@@ -758,8 +754,9 @@
   WebDragOperationsMask drag_operation_mask =
       static_cast<WebDragOperationsMask>(data_transfer->SourceOperation());
   WebPoint drag_screen_location(event->screenX(), event->screenY());
-  WebPoint drag_location(event->AbsoluteLocation().X() - Location().X(),
-                         event->AbsoluteLocation().Y() - Location().Y());
+  WebPoint drag_location(
+      event->AbsoluteLocation().X() - frame_rect_.Location().X(),
+      event->AbsoluteLocation().Y() - frame_rect_.Location().Y());
 
   web_plugin_->HandleDragStatusUpdate(drag_status, drag_data,
                                       drag_operation_mask, drag_location,
@@ -769,10 +766,9 @@
 void WebPluginContainerImpl::HandleWheelEvent(WheelEvent* event) {
   WebFloatPoint absolute_location = event->NativeEvent().PositionInRootFrame();
 
-  FrameView* view = ToFrameView(Parent());
   // Translate the root frame position to content coordinates.
-  if (view) {
-    absolute_location = view->RootFrameToContents(absolute_location);
+  if (parent_) {
+    absolute_location = parent_->RootFrameToContents(absolute_location);
   }
 
   IntPoint local_point =
@@ -838,14 +834,12 @@
       WebTouchEvent transformed_event =
           event->NativeEvent()->FlattenTransform();
 
-      FrameView* view = ToFrameView(Parent());
-
       for (unsigned i = 0; i < transformed_event.touches_length; ++i) {
         WebFloatPoint absolute_location = transformed_event.touches[i].position;
 
         // Translate the root frame position to content coordinates.
-        if (view) {
-          absolute_location = view->RootFrameToContents(absolute_location);
+        if (parent_) {
+          absolute_location = parent_->RootFrameToContents(absolute_location);
         }
 
         IntPoint local_point =
@@ -898,7 +892,7 @@
 
 void WebPluginContainerImpl::SynthesizeMouseEventIfPossible(TouchEvent* event) {
   WebMouseEventBuilder web_event(
-      ToFrameView(Parent()), LayoutItem(element_->GetLayoutObject()), *event);
+      parent_, LayoutItem(element_->GetLayoutObject()), *event);
   if (web_event.GetType() == WebInputEvent::kUndefined)
     return;
 
@@ -909,7 +903,7 @@
 }
 
 void WebPluginContainerImpl::FocusPlugin() {
-  LocalFrame& containing_frame = ToFrameView(Parent())->GetFrame();
+  LocalFrame& containing_frame = parent_->GetFrame();
   if (Page* current_page = containing_frame.GetPage())
     current_page->GetFocusController().SetFocusedElement(element_,
                                                          &containing_frame);
@@ -951,7 +945,7 @@
 
   LayoutBox* box = ToLayoutBox(owner_element->GetLayoutObject());
 
-  // Note: frameRect() for this plugin is equal to contentBoxRect, mapped to the
+  // Note: FrameRect() for this plugin is equal to contentBoxRect, mapped to the
   // containing view space, and rounded off.
   // See LayoutPart.cpp::updateGeometryInternal. To remove the lossy
   // effect of rounding off, use contentBoxRect directly.
@@ -960,13 +954,13 @@
 
   // The frameRect is already in absolute space of the local frame to the
   // plugin.
-  window_rect = FrameRect();
+  window_rect = frame_rect_;
   // Map up to the root frame.
   LayoutRect layout_window_rect =
       LayoutRect(element_->GetDocument()
                      .View()
                      ->GetLayoutViewItem()
-                     .LocalToAbsoluteQuad(FloatQuad(FloatRect(FrameRect())),
+                     .LocalToAbsoluteQuad(FloatQuad(FloatRect(frame_rect_)),
                                           kTraverseDocumentBoundaries)
                      .BoundingBox());
   // Finally, adjust for scrolling of the root frame, which the above does not
@@ -1010,10 +1004,10 @@
     ComputeClipRectsForPlugin(element_, window_rect, clip_rect,
                               unobscured_rect);
   }
-  GetPluginOcclusions(element_, this->Parent(), FrameRect(), cut_out_rects);
+  GetPluginOcclusions(element_, parent_, frame_rect_, cut_out_rects);
   // Convert to the plugin position.
   for (size_t i = 0; i < cut_out_rects.size(); i++)
-    cut_out_rects[i].Move(-FrameRect().X(), -FrameRect().Y());
+    cut_out_rects[i].Move(-frame_rect_.X(), -frame_rect_.Y());
 }
 
 }  // namespace blink
diff --git a/third_party/WebKit/Source/web/WebPluginContainerImpl.h b/third_party/WebKit/Source/web/WebPluginContainerImpl.h
index 1e01c54..34d3abd 100644
--- a/third_party/WebKit/Source/web/WebPluginContainerImpl.h
+++ b/third_party/WebKit/Source/web/WebPluginContainerImpl.h
@@ -34,7 +34,7 @@
 
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/plugins/PluginView.h"
-#include "platform/FrameViewBase.h"
+#include "platform/heap/Handle.h"
 #include "platform/wtf/Compiler.h"
 #include "platform/wtf/PassRefPtr.h"
 #include "platform/wtf/Vector.h"
@@ -59,7 +59,8 @@
 struct WebPrintPresetOptions;
 
 class WEB_EXPORT WebPluginContainerImpl final
-    : public PluginView,
+    : public GarbageCollectedFinalized<WebPluginContainerImpl>,
+      public PluginView,
       NON_EXPORTED_BASE(public WebPluginContainer),
       public ContextClient {
   USING_GARBAGE_COLLECTED_MIXIN(WebPluginContainerImpl);
@@ -70,8 +71,12 @@
                                         WebPlugin* web_plugin) {
     return new WebPluginContainerImpl(element, web_plugin);
   }
+  ~WebPluginContainerImpl() override;
 
   // PluginView methods
+  void SetParent(FrameView*) override;
+  FrameView* Parent() const override { return parent_; };
+  void SetParentVisible(bool) override;
   WebLayer* PlatformLayer() const override;
   v8::Local<v8::Object> ScriptableObject(v8::Isolate*) override;
   bool SupportsKeyboardFocus() const override;
@@ -80,21 +85,23 @@
   bool WantsWheelEvents() override;
   void UpdateAllLifecyclePhases() override;
   void InvalidatePaintIfNeeded() override { IssuePaintInvalidations(); }
-
-  // FrameViewBase methods
-  void SetFrameRect(const IntRect&) override;
-  void Paint(GraphicsContext&, const CullRect&) const override;
-  void InvalidateRect(const IntRect&) override;
+  void InvalidateRect(const IntRect&);
   void SetFocused(bool, WebFocusType) override;
-  void Show() override;
-  void Hide() override;
   void HandleEvent(Event*) override;
   void FrameRectsChanged() override;
-  void SetParentVisible(bool) override;
   void GeometryMayHaveChanged() override;
   bool IsPluginContainer() const override { return true; }
   void EventListenersRemoved() override;
 
+  // FrameOrPlugin methods
+  void SetFrameRect(const IntRect& frame_rect) override {
+    frame_rect_ = frame_rect;
+  }
+  const IntRect& FrameRect() const override { return frame_rect_; }
+  void Paint(GraphicsContext&, const CullRect&) const override;
+  void Show() override;
+  void Hide() override;
+
   // WebPluginContainer methods
   WebElement GetElement() override;
   WebDocument GetDocument() override;
@@ -182,7 +189,6 @@
       IntRect& unclipped_int_local_rect) const;
 
   WebPluginContainerImpl(HTMLPlugInElement*, WebPlugin*);
-  ~WebPluginContainerImpl() override;
 
   void HandleMouseEvent(MouseEvent*);
   void HandleDragEvent(MouseEvent*);
@@ -206,24 +212,24 @@
 
   friend class WebPluginContainerTest;
 
+  Member<FrameView> parent_;
   Member<HTMLPlugInElement> element_;
   WebPlugin* web_plugin_;
-
   WebLayer* web_layer_;
-
+  IntRect frame_rect_;
   IntRect pending_invalidation_rect_;
-
   TouchEventRequestType touch_event_request_type_;
   bool wants_wheel_events_;
-
+  bool self_visible_;
+  bool parent_visible_;
   bool is_disposed_;
 };
 
 DEFINE_TYPE_CASTS(WebPluginContainerImpl,
-                  FrameViewBase,
-                  frameViewBase,
-                  frameViewBase->IsPluginContainer(),
-                  frameViewBase.IsPluginContainer());
+                  PluginView,
+                  plugin,
+                  plugin->IsPluginContainer(),
+                  plugin.IsPluginContainer());
 // Unlike FrameViewBase, we need not worry about object type for container.
 // WebPluginContainerImpl is the only subclass of WebPluginContainer.
 DEFINE_TYPE_CASTS(WebPluginContainerImpl,
diff --git a/third_party/WebKit/public/BUILD.gn b/third_party/WebKit/public/BUILD.gn
index 6766533a..fbc3128 100644
--- a/third_party/WebKit/public/BUILD.gn
+++ b/third_party/WebKit/public/BUILD.gn
@@ -190,9 +190,7 @@
     "platform/WebFocusType.h",
     "platform/WebFont.h",
     "platform/WebFontDescription.h",
-    "platform/WebGamepad.h",
     "platform/WebGamepadListener.h",
-    "platform/WebGamepads.h",
     "platform/WebGestureCurve.h",
     "platform/WebGestureCurveTarget.h",
     "platform/WebGestureDevice.h",
diff --git a/third_party/WebKit/public/platform/Platform.h b/third_party/WebKit/public/platform/Platform.h
index eab1ca5..28b05e6 100644
--- a/third_party/WebKit/public/platform/Platform.h
+++ b/third_party/WebKit/public/platform/Platform.h
@@ -43,7 +43,6 @@
 #include "WebDeviceLightListener.h"
 #include "WebFeaturePolicy.h"
 #include "WebGamepadListener.h"
-#include "WebGamepads.h"
 #include "WebGestureDevice.h"
 #include "WebLocalizedString.h"
 #include "WebMessagePortChannel.h"
@@ -60,6 +59,10 @@
 #include "cc/surfaces/frame_sink_id.h"
 #include "mojo/public/cpp/system/message_pipe.h"
 
+namespace device {
+class Gamepads;
+}
+
 namespace gpu {
 class GpuMemoryBufferManager;
 }
@@ -280,7 +283,7 @@
 
   // Gamepad -------------------------------------------------------------
 
-  virtual void SampleGamepads(WebGamepads& into) {}
+  virtual void SampleGamepads(device::Gamepads& into) {}
 
   // History -------------------------------------------------------------
 
diff --git a/third_party/WebKit/public/platform/WebGamepad.h b/third_party/WebKit/public/platform/WebGamepad.h
deleted file mode 100644
index 72f1d67..0000000
--- a/third_party/WebKit/public/platform/WebGamepad.h
+++ /dev/null
@@ -1,137 +0,0 @@
-// Copyright (C) 2011, Google Inc. All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are met:
-//
-// 1. Redistributions of source code must retain the above copyright
-//    notice, this list of conditions and the following disclaimer.
-// 2. Redistributions in binary form must reproduce the above copyright
-//    notice, this list of conditions and the following disclaimer in the
-//    documentation and/or other materials provided with the distribution.
-//
-// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
-// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-// ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
-// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
-// DAMAGE.
-
-#ifndef WebGamepad_h
-#define WebGamepad_h
-
-#include "WebCommon.h"
-
-namespace blink {
-
-#pragma pack(push, 4)
-
-class WebGamepadButton {
- public:
-  WebGamepadButton() : pressed(false), touched(false), value(0.) {}
-  WebGamepadButton(bool pressed, bool touched, double value)
-      : pressed(pressed), touched(touched), value(value) {}
-  bool pressed;
-  bool touched;
-  double value;
-};
-
-class WebGamepadVector {
- public:
-  WebGamepadVector() : not_null(false) {}
-
-  bool not_null;
-  float x, y, z;
-};
-
-class WebGamepadQuaternion {
- public:
-  WebGamepadQuaternion() : not_null(false) {}
-
-  bool not_null;
-  float x, y, z, w;
-};
-
-class WebGamepadPose {
- public:
-  WebGamepadPose() : not_null(false) {}
-
-  bool not_null;
-
-  bool has_orientation;
-  bool has_position;
-
-  WebGamepadQuaternion orientation;
-  WebGamepadVector position;
-  WebGamepadVector angular_velocity;
-  WebGamepadVector linear_velocity;
-  WebGamepadVector angular_acceleration;
-  WebGamepadVector linear_acceleration;
-};
-
-enum WebGamepadHand {
-  kGamepadHandNone = 0,
-  kGamepadHandLeft = 1,
-  kGamepadHandRight = 2
-};
-
-// This structure is intentionally POD and fixed size so that it can be shared
-// memory between hardware polling threads and the rest of the browser. See
-// also WebGamepads.h.
-class WebGamepad {
- public:
-  static const size_t kIdLengthCap = 128;
-  static const size_t kMappingLengthCap = 16;
-  static const size_t kAxesLengthCap = 16;
-  static const size_t kButtonsLengthCap = 32;
-
-  WebGamepad()
-      : connected(false),
-        timestamp(0),
-        axes_length(0),
-        buttons_length(0),
-        display_id(0) {
-    id[0] = 0;
-    mapping[0] = 0;
-  }
-
-  // Is there a gamepad connected at this index?
-  bool connected;
-
-  // Device identifier (based on manufacturer, model, etc.).
-  WebUChar id[kIdLengthCap];
-
-  // Monotonically increasing value referring to when the data were last
-  // updated.
-  unsigned long long timestamp;
-
-  // Number of valid entries in the axes array.
-  unsigned axes_length;
-
-  // Normalized values representing axes, in the range [-1..1].
-  double axes[kAxesLengthCap];
-
-  // Number of valid entries in the buttons array.
-  unsigned buttons_length;
-
-  // Button states
-  WebGamepadButton buttons[kButtonsLengthCap];
-
-  // Mapping type (for example "standard")
-  WebUChar mapping[kMappingLengthCap];
-
-  WebGamepadPose pose;
-
-  WebGamepadHand hand;
-
-  unsigned display_id;
-};
-
-#pragma pack(pop)
-}
-
-#endif  // WebGamepad_h
diff --git a/third_party/WebKit/public/platform/WebGamepadListener.h b/third_party/WebKit/public/platform/WebGamepadListener.h
index f2fbffc..75016fa8 100644
--- a/third_party/WebKit/public/platform/WebGamepadListener.h
+++ b/third_party/WebKit/public/platform/WebGamepadListener.h
@@ -7,14 +7,16 @@
 
 #include "WebPlatformEventListener.h"
 
-namespace blink {
+namespace device {
+class Gamepad;
+}
 
-class WebGamepad;
+namespace blink {
 
 class WebGamepadListener : public WebPlatformEventListener {
  public:
-  virtual void DidConnectGamepad(unsigned index, const WebGamepad&) = 0;
-  virtual void DidDisconnectGamepad(unsigned index, const WebGamepad&) = 0;
+  virtual void DidConnectGamepad(unsigned index, const device::Gamepad&) = 0;
+  virtual void DidDisconnectGamepad(unsigned index, const device::Gamepad&) = 0;
 
  protected:
   virtual ~WebGamepadListener() {}
diff --git a/third_party/WebKit/public/platform/WebGamepads.h b/third_party/WebKit/public/platform/WebGamepads.h
deleted file mode 100644
index 75d8942..0000000
--- a/third_party/WebKit/public/platform/WebGamepads.h
+++ /dev/null
@@ -1,47 +0,0 @@
-// Copyright (C) 2011, Google Inc. All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are met:
-//
-// 1. Redistributions of source code must retain the above copyright
-//    notice, this list of conditions and the following disclaimer.
-// 2. Redistributions in binary form must reproduce the above copyright
-//    notice, this list of conditions and the following disclaimer in the
-//    documentation and/or other materials provided with the distribution.
-//
-// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
-// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-// ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
-// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
-// DAMAGE.
-
-#ifndef WebGamepads_h
-#define WebGamepads_h
-
-#include "WebGamepad.h"
-
-#pragma pack(push, 4)
-
-namespace blink {
-
-// This structure is intentionally POD and fixed size so that it can be stored
-// in shared memory between hardware polling threads and the rest of the
-// browser.
-class WebGamepads {
- public:
-  static const size_t kItemsLengthCap = 4;
-
-  // Gamepad data for N separate gamepad devices.
-  WebGamepad items[kItemsLengthCap];
-};
-
-#pragma pack(pop)
-}
-
-#endif  // WebGamepads_h
diff --git a/third_party/closure_compiler/externs/bookmark_manager_private.js b/third_party/closure_compiler/externs/bookmark_manager_private.js
index e59da2b7a..d62688cc 100644
--- a/third_party/closure_compiler/externs/bookmark_manager_private.js
+++ b/third_party/closure_compiler/externs/bookmark_manager_private.js
@@ -111,12 +111,6 @@
 chrome.bookmarkManagerPrivate.canEdit = function(callback) {};
 
 /**
- * Whether bookmarks can be opened in new windows
- * @param {Function} callback
- */
-chrome.bookmarkManagerPrivate.canOpenNewWindows = function(callback) {};
-
-/**
  * Recursively removes list of bookmarks nodes.
  * @param {Array} idList An array of string-valued ids
  * @param {Function=} callback
diff --git a/tools/android/eclipse/.classpath b/tools/android/eclipse/.classpath
index f3f4661..91700431 100644
--- a/tools/android/eclipse/.classpath
+++ b/tools/android/eclipse/.classpath
@@ -56,6 +56,7 @@
     <classpathentry kind="src" path="components/location/android/java/src"/>
     <classpathentry kind="src" path="components/navigation_interception/android/java/src"/>
     <classpathentry kind="src" path="components/ntp_tiles/android/java/src"/>
+    <classpathentry kind="src" path="components/offline_items_collection/core/android/java/src"/>
     <classpathentry kind="src" path="components/payments/content/android/java/src"/>
     <classpathentry kind="src" path="components/policy/android/java/src"/>
     <classpathentry kind="src" path="components/precache/android/java/src"/>
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index d88b5df2..bbe30331 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -81712,6 +81712,14 @@
   </summary>
 </histogram>
 
+<histogram name="WinJumplist.DeleteDirectoryContentDuration" units="ms">
+  <owner>chengx@chromium.org</owner>
+  <summary>
+    Time spent in DeleteDirectoryContentAndLogResults(). This method is to
+    delete the icon files in JumpListIcons folder.
+  </summary>
+</histogram>
+
 <histogram name="WinJumplist.DeleteStatusJumpListIcons"
     enum="JumplisticonsDeleteCategory">
   <owner>chengx@chromium.org</owner>
@@ -92101,7 +92109,7 @@
   <int value="239" label="DOWNLOADS_SEARCH"/>
   <int value="240" label="FONTSETTINGS_CLEARFONT"/>
   <int value="241" label="WINDOWS_UPDATE"/>
-  <int value="242" label="BOOKMARKMANAGERPRIVATE_CANOPENNEWWINDOWS"/>
+  <int value="242" label="DELETED_BOOKMARKMANAGERPRIVATE_CANOPENNEWWINDOWS"/>
   <int value="243" label="SERIAL_FLUSH"/>
   <int value="244" label="BROWSERACTION_SETTITLE"/>
   <int value="245" label="BOOKMARKMANAGERPRIVATE_CANEDIT"/>
@@ -103733,6 +103741,7 @@
   <int value="16" label="UpdateMediaSinks"/>
   <int value="17" label="SearchSinks"/>
   <int value="18" label="ProvideSinks"/>
+  <int value="19" label="CreateMediaRouteController"/>
 </enum>
 
 <enum name="MediaRouteProviderWakeup" type="int">
diff --git a/ui/arc/notification/arc_custom_notification_item.cc b/ui/arc/notification/arc_custom_notification_item.cc
index e0b0417..521145d 100644
--- a/ui/arc/notification/arc_custom_notification_item.cc
+++ b/ui/arc/notification/arc_custom_notification_item.cc
@@ -102,6 +102,7 @@
 
   pinned_ = rich_data.pinned;
   expand_state_ = data->expand_state;
+  shown_contents_ = data->shown_contents;
 
   if (!data->snapshot_image || data->snapshot_image->isNull()) {
     snapshot_ = gfx::ImageSkia();
diff --git a/ui/arc/notification/arc_custom_notification_item.h b/ui/arc/notification/arc_custom_notification_item.h
index 3a671b9..f4ed4567 100644
--- a/ui/arc/notification/arc_custom_notification_item.h
+++ b/ui/arc/notification/arc_custom_notification_item.h
@@ -53,11 +53,16 @@
   mojom::ArcNotificationExpandState expand_state() const {
     return expand_state_;
   }
+  mojom::ArcNotificationShownContents shown_contents() const {
+    return shown_contents_;
+  }
 
  private:
   bool pinned_ = false;
   mojom::ArcNotificationExpandState expand_state_ =
       mojom::ArcNotificationExpandState::FIXED_SIZE;
+  mojom::ArcNotificationShownContents shown_contents_ =
+      mojom::ArcNotificationShownContents::CONTENTS_SHOWN;
   gfx::ImageSkia snapshot_;
   int window_ref_count_ = 0;
 
diff --git a/ui/arc/notification/arc_custom_notification_view.cc b/ui/arc/notification/arc_custom_notification_view.cc
index 8afd6fb..671ead9 100644
--- a/ui/arc/notification/arc_custom_notification_view.cc
+++ b/ui/arc/notification/arc_custom_notification_view.cc
@@ -13,12 +13,15 @@
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/events/event_handler.h"
+#include "ui/gfx/animation/linear_animation.h"
+#include "ui/gfx/animation/tween.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/transform.h"
 #include "ui/message_center/message_center_style.h"
 #include "ui/message_center/views/custom_notification_view.h"
 #include "ui/message_center/views/toast_contents_view.h"
 #include "ui/strings/grit/ui_strings.h"
+#include "ui/views/background.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/layout/box_layout.h"
 #include "ui/views/painter.h"
@@ -28,6 +31,22 @@
 
 namespace arc {
 
+namespace {
+
+// This value should be the same as the duration of reveal animation of
+// the settings view of an Android notification.
+constexpr int kBackgroundColorChangeDuration = 360;
+
+SkColor GetControlButtonBackgroundColor(
+    const mojom::ArcNotificationShownContents& shown_contents) {
+  if (shown_contents == mojom::ArcNotificationShownContents::CONTENTS_SHOWN)
+    return message_center::kControlButtonBackgroundColor;
+  else
+    return SK_ColorTRANSPARENT;
+}
+
+}  // namespace
+
 class ArcCustomNotificationView::EventForwarder : public ui::EventHandler {
  public:
   explicit EventForwarder(ArcCustomNotificationView* owner) : owner_(owner) {}
@@ -189,7 +208,12 @@
 
 ArcCustomNotificationView::ControlButton::ControlButton(
     ArcCustomNotificationView* owner)
-    : message_center::PaddedButton(owner), owner_(owner) {}
+    : message_center::PaddedButton(owner), owner_(owner) {
+  if (!owner_->item_) {
+    set_background(views::Background::CreateSolidBackground(
+        GetControlButtonBackgroundColor(owner_->item_->shown_contents())));
+  }
+}
 
 void ArcCustomNotificationView::ControlButton::OnFocus() {
   message_center::PaddedButton::OnFocus();
@@ -240,6 +264,7 @@
 
 void ArcCustomNotificationView::CreateCloseButton() {
   DCHECK(control_buttons_view_);
+  DCHECK(item_);
 
   close_button_ = base::MakeUnique<ControlButton>(this);
   close_button_->SetImage(views::CustomButton::STATE_NORMAL,
@@ -254,6 +279,7 @@
 
 void ArcCustomNotificationView::CreateSettingsButton() {
   DCHECK(control_buttons_view_);
+  DCHECK(item_);
 
   settings_button_ = new ControlButton(this);
   settings_button_->SetImage(views::CustomButton::STATE_NORMAL,
@@ -280,7 +306,8 @@
 
   if (item_ && item_->IsOpeningSettingsSupported())
     CreateSettingsButton();
-  CreateCloseButton();
+  if (item_ && !item_->pinned())
+    CreateCloseButton();
 
   views::Widget::InitParams params(views::Widget::InitParams::TYPE_CONTROL);
   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
@@ -413,6 +440,28 @@
     UpdatePinnedState();
 }
 
+void ArcCustomNotificationView::StartControlButtonsColorAnimation() {
+  if (control_button_color_animation_)
+    control_button_color_animation_->End();
+  control_button_color_animation_.reset(new gfx::LinearAnimation(this));
+  control_button_color_animation_->SetDuration(kBackgroundColorChangeDuration);
+  control_button_color_animation_->Start();
+}
+
+bool ArcCustomNotificationView::ShouldUpdateControlButtonsColor() const {
+  DCHECK(item_);
+
+  if (settings_button_ &&
+      settings_button_->background()->get_color() !=
+          GetControlButtonBackgroundColor(item_->shown_contents()))
+    return true;
+  if (close_button_ &&
+      close_button_->background()->get_color() !=
+          GetControlButtonBackgroundColor(item_->shown_contents()))
+    return true;
+  return false;
+}
+
 void ArcCustomNotificationView::ViewHierarchyChanged(
     const views::View::ViewHierarchyChangedDetails& details) {
   views::Widget* widget = GetWidget();
@@ -620,6 +669,8 @@
 void ArcCustomNotificationView::OnItemUpdated() {
   UpdatePinnedState();
   UpdateSnapshot();
+  if (ShouldUpdateControlButtonsColor())
+    StartControlButtonsColorAnimation();
 }
 
 void ArcCustomNotificationView::OnNotificationSurfaceAdded(
@@ -638,4 +689,36 @@
   SetSurface(nullptr);
 }
 
+void ArcCustomNotificationView::AnimationEnded(
+    const gfx::Animation* animation) {
+  DCHECK_EQ(animation, control_button_color_animation_.get());
+  control_button_color_animation_.reset();
+}
+
+void ArcCustomNotificationView::AnimationProgressed(
+    const gfx::Animation* animation) {
+  DCHECK_EQ(animation, control_button_color_animation_.get());
+
+  if (item_) {
+    const SkColor target =
+        GetControlButtonBackgroundColor(item_->shown_contents());
+    const SkColor start =
+        target == message_center::kControlButtonBackgroundColor
+            ? SK_ColorTRANSPARENT
+            : message_center::kControlButtonBackgroundColor;
+    const SkColor current_color = gfx::Tween::ColorValueBetween(
+        animation->GetCurrentValue(), start, target);
+    if (settings_button_) {
+      settings_button_->set_background(
+          views::Background::CreateSolidBackground(current_color));
+      settings_button_->SchedulePaint();
+    }
+    if (close_button_) {
+      close_button_->set_background(
+          views::Background::CreateSolidBackground(current_color));
+      close_button_->SchedulePaint();
+    }
+  }
+}
+
 }  // namespace arc
diff --git a/ui/arc/notification/arc_custom_notification_view.h b/ui/arc/notification/arc_custom_notification_view.h
index 2ecb192..0e58d7e 100644
--- a/ui/arc/notification/arc_custom_notification_view.h
+++ b/ui/arc/notification/arc_custom_notification_view.h
@@ -12,6 +12,7 @@
 #include "ui/arc/notification/arc_custom_notification_item.h"
 #include "ui/arc/notification/arc_notification_surface_manager.h"
 #include "ui/aura/window_observer.h"
+#include "ui/gfx/animation/animation_delegate.h"
 #include "ui/message_center/views/custom_notification_content_view_delegate.h"
 #include "ui/message_center/views/padded_button.h"
 #include "ui/views/controls/button/button.h"
@@ -21,6 +22,10 @@
 class NotificationSurface;
 }
 
+namespace gfx {
+class LinearAnimation;
+}
+
 namespace views {
 class FocusTraversable;
 class Widget;
@@ -33,7 +38,8 @@
       public views::ButtonListener,
       public aura::WindowObserver,
       public ArcCustomNotificationItem::Observer,
-      public ArcNotificationSurfaceManager::Observer {
+      public ArcNotificationSurfaceManager::Observer,
+      public gfx::AnimationDelegate {
  public:
   explicit ArcCustomNotificationView(ArcCustomNotificationItem* item);
   ~ArcCustomNotificationView() override;
@@ -72,6 +78,8 @@
   void UpdateSnapshot();
   void AttachSurface();
   void ActivateToast();
+  void StartControlButtonsColorAnimation();
+  bool ShouldUpdateControlButtonsColor() const;
 
   // views::NativeViewHost
   void ViewHierarchyChanged(
@@ -104,6 +112,10 @@
   void OnNotificationSurfaceAdded(exo::NotificationSurface* surface) override;
   void OnNotificationSurfaceRemoved(exo::NotificationSurface* surface) override;
 
+  // AnimationDelegate
+  void AnimationEnded(const gfx::Animation* animation) override;
+  void AnimationProgressed(const gfx::Animation* animation) override;
+
   ArcCustomNotificationItem* item_ = nullptr;
   exo::NotificationSurface* surface_ = nullptr;
 
@@ -133,6 +145,8 @@
   // Protects from call loops between Layout and OnWindowBoundsChanged.
   bool in_layout_ = false;
 
+  std::unique_ptr<gfx::LinearAnimation> control_button_color_animation_;
+
   DISALLOW_COPY_AND_ASSIGN(ArcCustomNotificationView);
 };
 
diff --git a/ui/message_center/message_center_style.h b/ui/message_center/message_center_style.h
index e3e245a..289903d 100644
--- a/ui/message_center/message_center_style.h
+++ b/ui/message_center/message_center_style.h
@@ -96,6 +96,9 @@
 const SkColor kSmallImageMaskForegroundColor = SK_ColorWHITE;
 // Background of small icon image.
 const SkColor kSmallImageMaskBackgroundColor = SkColorSetRGB(0xa3, 0xa3, 0xa3);
+// Background of the close button and the settings button
+const SkColor kControlButtonBackgroundColor =
+    SkColorSetA(SK_ColorWHITE, 0.9 * 0xff);
 
 // Limits.
 
diff --git a/ui/message_center/views/padded_button.cc b/ui/message_center/views/padded_button.cc
index 4c73a90f..08e3e6f 100644
--- a/ui/message_center/views/padded_button.cc
+++ b/ui/message_center/views/padded_button.cc
@@ -22,8 +22,8 @@
   SetFocusPainter(views::Painter::CreateSolidFocusPainter(
       kFocusBorderColor,
       gfx::Insets(1, 2, 2, 2)));
-  set_background(views::Background::CreateSolidBackground(
-      SkColorSetA(SK_ColorWHITE, 0.9 * 0xff)));
+  set_background(
+      views::Background::CreateSolidBackground(kControlButtonBackgroundColor));
   SetBorder(views::CreateEmptyBorder(gfx::Insets(kControlButtonBorderSize)));
   set_animate_on_state_change(false);
 
diff --git a/ui/snapshot/snapshot.cc b/ui/snapshot/snapshot.cc
index aaee01f1..6e5188c2 100644
--- a/ui/snapshot/snapshot.cc
+++ b/ui/snapshot/snapshot.cc
@@ -7,22 +7,40 @@
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/task_runner_util.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/gfx/codec/png_codec.h"
 #include "ui/gfx/image/image.h"
+#include "ui/gfx/image/image_skia.h"
+#include "ui/gfx/image/image_util.h"
 
 namespace ui {
 
 namespace {
 
-scoped_refptr<base::RefCountedMemory> EncodeImage(const gfx::Image& image) {
-  return image.As1xPNGBytes();
+scoped_refptr<base::RefCountedMemory> EncodeImageAsPNG(
+    const gfx::Image& image) {
+  std::vector<uint8_t> result;
+  DCHECK(!image.AsImageSkia().GetRepresentation(1.0f).is_null());
+  gfx::PNGCodec::FastEncodeBGRASkBitmap(image.AsBitmap(), true, &result);
+  return new base::RefCountedBytes(result);
 }
 
-void EncodeImageAndSchedulePNGCallback(
+scoped_refptr<base::RefCountedMemory> EncodeImageAsJPEG(
+    const gfx::Image& image) {
+  std::vector<uint8_t> result;
+  DCHECK(!image.AsImageSkia().GetRepresentation(1.0f).is_null());
+  gfx::JPEG1xEncodedDataFromImage(image, 100, &result);
+  return new base::RefCountedBytes(result);
+}
+
+void EncodeImageAndScheduleCallback(
+    scoped_refptr<base::RefCountedMemory> (*encode_func)(const gfx::Image&),
     scoped_refptr<base::TaskRunner> background_task_runner,
-    const GrabWindowSnapshotAsyncPNGCallback& callback,
+    const base::Callback<void(scoped_refptr<base::RefCountedMemory> data)>&
+        callback,
     const gfx::Image& image) {
   base::PostTaskAndReplyWithResult(background_task_runner.get(), FROM_HERE,
-                                   base::Bind(EncodeImage, image), callback);
+                                   base::Bind(encode_func, image), callback);
 }
 
 }  // namespace
@@ -34,7 +52,18 @@
     const GrabWindowSnapshotAsyncPNGCallback& callback) {
   GrabWindowSnapshotAsync(
       window, source_rect,
-      base::Bind(EncodeImageAndSchedulePNGCallback,
+      base::Bind(EncodeImageAndScheduleCallback, &EncodeImageAsPNG,
+                 std::move(background_task_runner), callback));
+}
+
+void GrabWindowSnapshotAsyncJPEG(
+    gfx::NativeWindow window,
+    const gfx::Rect& source_rect,
+    scoped_refptr<base::TaskRunner> background_task_runner,
+    const GrabWindowSnapshotAsyncJPEGCallback& callback) {
+  GrabWindowSnapshotAsync(
+      window, source_rect,
+      base::Bind(EncodeImageAndScheduleCallback, &EncodeImageAsJPEG,
                  std::move(background_task_runner), callback));
 }
 
diff --git a/ui/snapshot/snapshot.h b/ui/snapshot/snapshot.h
index 3c83a92..31b9755a 100644
--- a/ui/snapshot/snapshot.h
+++ b/ui/snapshot/snapshot.h
@@ -61,14 +61,22 @@
     const gfx::Rect& source_rect,
     const GrabWindowSnapshotAsyncCallback& callback);
 
-typedef base::Callback<void(scoped_refptr<base::RefCountedMemory> png_data)>
-    GrabWindowSnapshotAsyncPNGCallback;
+using GrabWindowSnapshotAsyncPNGCallback =
+    base::Callback<void(scoped_refptr<base::RefCountedMemory> data)>;
 SNAPSHOT_EXPORT void GrabWindowSnapshotAsyncPNG(
     gfx::NativeWindow window,
     const gfx::Rect& source_rect,
     scoped_refptr<base::TaskRunner> background_task_runner,
     const GrabWindowSnapshotAsyncPNGCallback& callback);
 
+using GrabWindowSnapshotAsyncJPEGCallback =
+    base::Callback<void(scoped_refptr<base::RefCountedMemory> data)>;
+SNAPSHOT_EXPORT void GrabWindowSnapshotAsyncJPEG(
+    gfx::NativeWindow window,
+    const gfx::Rect& source_rect,
+    scoped_refptr<base::TaskRunner> background_task_runner,
+    const GrabWindowSnapshotAsyncJPEGCallback& callback);
+
 }  // namespace ui
 
 #endif  // UI_SNAPSHOT_SNAPSHOT_H_