diff --git a/DEPS b/DEPS
index 55ac4bed..04217dd 100644
--- a/DEPS
+++ b/DEPS
@@ -54,7 +54,7 @@
   'checkout_telemetry_dependencies': False,
 
   # libaom provides support for AV1 but the bitstream is not frozen.
-  'checkout_libaom': False,
+  'checkout_libaom': True,
 
   # TODO(dpranke): change to != "small" once != is supported.
   'checkout_traffic_annotation_tools': 'checkout_configuration == "default"',
diff --git a/third_party/WebKit/LayoutTests/TestExpectations b/third_party/WebKit/LayoutTests/TestExpectations
index 6388bb7..4b4fc68 100644
--- a/third_party/WebKit/LayoutTests/TestExpectations
+++ b/third_party/WebKit/LayoutTests/TestExpectations
@@ -82,25 +82,18 @@
 crbug.com/771643 virtual/spv175/compositing/composited-descendant-requiring-border-radius-mask.html [ Failure ]
 crbug.com/771643 virtual/spv175/compositing/composited-scaled-child-with-border-radius-parent-clip.html [ Failure ]
 crbug.com/771643 virtual/spv175/compositing/composited-translated-child-with-border-radius-parent-clip.html [ Failure ]
-crbug.com/771643 virtual/spv175/compositing/opacity-with-mask.html [ Failure ]
 crbug.com/771643 virtual/spv175/compositing/fixed-body-background-positioned.html [ Failure Pass ]
 crbug.com/771643 virtual/spv175/compositing/geometry/repaint-foreground-layer.html [ Crash ]
 crbug.com/771643 virtual/spv175/compositing/images/direct-image-dynamic-border-radius.html [ Failure ]
-crbug.com/771643 virtual/spv175/compositing/masks/mask-with-added-filters.html [ Failure Pass ]
-crbug.com/771643 virtual/spv175/compositing/masks/mask-with-removed-filters.html [ Failure ]
-crbug.com/771643 virtual/spv175/compositing/masks/multiple-masks.html [ Failure ]
-crbug.com/771643 virtual/spv175/compositing/masks/simple-composited-mask.html [ Failure ]
+crbug.com/771643 virtual/spv175/compositing/opacity-with-mask.html [ Failure ]
 crbug.com/771643 virtual/spv175/compositing/overflow/border-radius-on-grandparent-composited-grandchild.html [ Failure ]
 crbug.com/771643 virtual/spv175/compositing/overflow/border-radius-on-parent-composited-grandchild.html [ Failure ]
 crbug.com/771643 virtual/spv175/compositing/overflow/border-radius-on-two-ancestors-composited-grandchild.html [ Failure ]
 crbug.com/771643 virtual/spv175/compositing/overflow/border-radius-outside-bounds-of-compositing-ancestor.html [ Failure ]
 crbug.com/771643 virtual/spv175/compositing/overflow/border-radius-styles-with-composited-child.html [ Failure ]
 crbug.com/771643 virtual/spv175/compositing/overflow/composited-layer-under-border-radius-under-composited-layer.html [ Failure ]
-crbug.com/771643 virtual/spv175/compositing/overflow/do-not-paint-outline-into-composited-scrolling-contents.html [ Failure ]
 crbug.com/771643 virtual/spv175/compositing/overflow/grandchild-composited-with-border-radius-ancestor.html [ Failure ]
 crbug.com/771643 virtual/spv175/compositing/overflow/grandchild-with-border-radius-ancestor.html [ Failure ]
-crbug.com/771643 virtual/spv175/compositing/overflow/mask-with-small-content-rect.html [ Failure ]
-crbug.com/771643 virtual/spv175/compositing/overflow/overflow-scroll-with-negative-offset-translucent-outline.html [ Failure ]
 crbug.com/771643 virtual/spv175/compositing/overflow/relpos-under-abspos-border-radius.html [ Failure ]
 crbug.com/771643 virtual/spv175/compositing/overflow/scroll-ancestor-update.html [ Failure ]
 crbug.com/771643 virtual/spv175/compositing/overflow/scroll-neg-z-index-and-composited-child.html [ Failure ]
@@ -111,16 +104,13 @@
 crbug.com/771643 virtual/spv175/compositing/squashing/squash-composited-input.html [ Failure ]
 crbug.com/771643 virtual/spv175/compositing/squashing/squash-overflow-hidden-scrolltop.html [ Failure ]
 crbug.com/771643 virtual/spv175/compositing/squashing/squash-with-ancestor-reflection.html [ Failure ]
-crbug.com/771643 virtual/spv175/compositing/squashing/visibility-composited-squashing.html [ Failure ]
 crbug.com/771643 virtual/spv175/compositing/visibility/visibility-image-layers.html [ Failure Pass ]
 crbug.com/771643 virtual/spv175/paint/invalidation/offset-change-wrong-invalidation-with-float.html [ Failure ]
 crbug.com/771643 virtual/spv175/paint/invalidation/repaint-across-writing-mode-boundary.html [ Failure ]
-crbug.com/771643 virtual/spv175/paint/invalidation/compositing/newly-composited-repaint-rect.html [ Failure ]
 crbug.com/771643 virtual/spv175/paint/invalidation/compositing/resize-squashing-layer-that-needs-full-repaint.html [ Failure ]
 crbug.com/771643 virtual/spv175/paint/invalidation/compositing/subpixel-offset-scaled-transform-composited.html [ Failure ]
 crbug.com/771643 virtual/spv175/paint/invalidation/forms/select-option-background-color.html [ Failure ]
 crbug.com/771643 virtual/spv175/paint/invalidation/multicol/multicol-with-overflowing-block-rl.html [ Failure ]
-crbug.com/771643 virtual/spv175/paint/invalidation/overflow/composited-overflow-with-negative-offset-outline.html [ Failure ]
 crbug.com/771643 virtual/spv175/paint/invalidation/overflow/paged-with-overflowing-block-rl.html [ Failure ]
 crbug.com/771643 virtual/spv175/paint/invalidation/position/position-change-keeping-geometry.html [ Failure ]
 crbug.com/771643 virtual/spv175/paint/invalidation/reflection/reflection-repaint-test.html [ Failure ]
diff --git a/third_party/WebKit/LayoutTests/virtual/spv175/compositing/overflow/mask-with-small-content-rect-expected.png b/third_party/WebKit/LayoutTests/virtual/spv175/compositing/overflow/mask-with-small-content-rect-expected.png
index 66fa0662..28103ae5 100644
--- a/third_party/WebKit/LayoutTests/virtual/spv175/compositing/overflow/mask-with-small-content-rect-expected.png
+++ b/third_party/WebKit/LayoutTests/virtual/spv175/compositing/overflow/mask-with-small-content-rect-expected.png
Binary files differ
diff --git a/third_party/WebKit/LayoutTests/virtual/spv175/paint/invalidation/overflow/composited-overflow-with-negative-offset-outline-expected.txt b/third_party/WebKit/LayoutTests/virtual/spv175/paint/invalidation/overflow/composited-overflow-with-negative-offset-outline-expected.txt
new file mode 100644
index 0000000..0682abe
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/virtual/spv175/paint/invalidation/overflow/composited-overflow-with-negative-offset-outline-expected.txt
@@ -0,0 +1,68 @@
+{
+  "layers": [
+    {
+      "name": "LayoutView #document",
+      "bounds": [800, 600],
+      "contentsOpaque": true,
+      "backgroundColor": "#FFFFFF"
+    },
+    {
+      "name": "LayoutBlockFlow DIV id='scroller'",
+      "position": [8, 8],
+      "bounds": [200, 200]
+    },
+    {
+      "name": "Scrolling Layer",
+      "position": [8, 8],
+      "bounds": [185, 185],
+      "drawsContent": false
+    },
+    {
+      "name": "Scrolling Contents Layer",
+      "position": [8, 8],
+      "bounds": [185, 300]
+    },
+    {
+      "name": "Overflow Controls Host Layer",
+      "position": [8, 8],
+      "bounds": [200, 200],
+      "drawsContent": false
+    },
+    {
+      "name": "Horizontal Scrollbar Layer",
+      "position": [8, 193],
+      "bounds": [185, 15],
+      "drawsContent": false
+    },
+    {
+      "name": "Vertical Scrollbar Layer",
+      "position": [193, 8],
+      "bounds": [15, 185],
+      "drawsContent": false
+    },
+    {
+      "name": "Scroll Corner Layer",
+      "position": [193, 193],
+      "bounds": [15, 15]
+    },
+    {
+      "name": "Decoration Layer",
+      "position": [8, 8],
+      "bounds": [200, 200],
+      "paintInvalidations": [
+        {
+          "object": "LayoutBlockFlow DIV id='scroller'",
+          "rect": [0, 0, 200, 200],
+          "reason": "style change"
+        }
+      ]
+    }
+  ],
+  "objectPaintInvalidations": [
+    {
+      "object": "LayoutBlockFlow DIV id='scroller'",
+      "reason": "style change"
+    }
+  ]
+}
+
diff --git a/third_party/WebKit/Source/core/page/PageOverlay.cpp b/third_party/WebKit/Source/core/page/PageOverlay.cpp
index 5bb6ebe..96045f04 100644
--- a/third_party/WebKit/Source/core/page/PageOverlay.cpp
+++ b/third_party/WebKit/Source/core/page/PageOverlay.cpp
@@ -84,6 +84,11 @@
     } else {
       frame_impl_->FrameWidget()->RootGraphicsLayer()->AddChild(layer_.get());
     }
+
+    if (RuntimeEnabledFeatures::SlimmingPaintV175Enabled()) {
+      layer_->SetLayerState(PropertyTreeState(PropertyTreeState::Root()),
+                            IntPoint());
+    }
   }
 
   FloatSize size(frame->GetPage()->GetVisualViewport().Size());
diff --git a/third_party/WebKit/Source/core/paint/compositing/CompositedLayerMapping.cpp b/third_party/WebKit/Source/core/paint/compositing/CompositedLayerMapping.cpp
index 9c74bfd..922e75a8 100644
--- a/third_party/WebKit/Source/core/paint/compositing/CompositedLayerMapping.cpp
+++ b/third_party/WebKit/Source/core/paint/compositing/CompositedLayerMapping.cpp
@@ -874,10 +874,13 @@
       layer_config_changed = true;
   }
 
-  // Changes to either the internal hierarchy or the mask layer have an impact
-  // on painting phases, so we need to update when either are updated.
-  if (layer_config_changed || mask_layer_changed)
+  if (layer_config_changed || mask_layer_changed) {
+    // Changes to either the internal hierarchy or the mask layer have an impact
+    // on painting phases, so we need to update when either are updated.
     UpdatePaintingPhases();
+    // Need to update paint property states of the changed GraphicsLayers.
+    layout_object.SetNeedsPaintPropertyUpdate();
+  }
 
   UpdateElementId();
 
diff --git a/third_party/WebKit/Source/core/paint/compositing/CompositingLayerPropertyUpdater.cpp b/third_party/WebKit/Source/core/paint/compositing/CompositingLayerPropertyUpdater.cpp
index a726a8516..6ffd2a55 100644
--- a/third_party/WebKit/Source/core/paint/compositing/CompositingLayerPropertyUpdater.cpp
+++ b/third_party/WebKit/Source/core/paint/compositing/CompositingLayerPropertyUpdater.cpp
@@ -47,6 +47,8 @@
   SetContainerLayerState(mapping->LayerForHorizontalScrollbar());
   SetContainerLayerState(mapping->LayerForVerticalScrollbar());
   SetContainerLayerState(mapping->LayerForScrollCorner());
+  SetContainerLayerState(mapping->DecorationOutlineLayer());
+  SetContainerLayerState(mapping->BackgroundLayer());
 
   auto SetContentsLayerState =
       [rare_paint_data, &snapped_paint_offset](GraphicsLayer* graphics_layer) {
@@ -59,12 +61,23 @@
   SetContentsLayerState(mapping->ScrollingContentsLayer());
   SetContentsLayerState(mapping->ForegroundLayer());
 
-  if (GraphicsLayer* squashing_layer = mapping->SquashingLayer()) {
+  if (auto* squashing_layer = mapping->SquashingLayer()) {
     squashing_layer->SetLayerState(
         rare_paint_data->PreEffectProperties(),
         snapped_paint_offset + mapping->SquashingLayerOffsetFromLayoutObject());
   }
-  // TODO(trchen): Complete for all drawable layers.
+
+  if (auto* mask_layer = mapping->MaskLayer()) {
+    auto state = *rare_paint_data->LocalBorderBoxProperties();
+    const auto* properties = rare_paint_data->PaintProperties();
+    DCHECK(properties && properties->Mask());
+    state.SetEffect(properties->Mask());
+    mask_layer->SetLayerState(
+        std::move(state),
+        snapped_paint_offset + mask_layer->OffsetFromLayoutObject());
+  }
+
+  // TODO(crbug.com/790548): Complete for all drawable layers.
 }
 
 void CompositingLayerPropertyUpdater::Update(const LocalFrameView& frame_view) {
@@ -84,7 +97,6 @@
   SetOverflowControlLayerState(frame_view.LayerForHorizontalScrollbar());
   SetOverflowControlLayerState(frame_view.LayerForVerticalScrollbar());
   SetOverflowControlLayerState(frame_view.LayerForScrollCorner());
-  // TODO(trchen): Complete for all drawable layers.
 }
 
 }  // namespace blink