Upstream scroll-boundary-behavior.html to wpt test.

This patch upstreams scroll_boundary_behavior.html to a web-platfrom-test. It
is currently a manual test. It asks users to perform some scroll/drag
behaviors and tap the "Done" button, and then checks the result.

Bug: 762054
Change-Id: I9be937341d5d95137c715b8111b557f09baf8a80
Reviewed-on: https://chromium-review.googlesource.com/653810
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Reviewed-by: Philip J├Ągenstedt <foolip@chromium.org>
Commit-Queue: Sandra Sun <sunyunjia@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501633}
diff --git a/third_party/WebKit/LayoutTests/TestExpectations b/third_party/WebKit/LayoutTests/TestExpectations
index a4dc899..8693f8b 100644
--- a/third_party/WebKit/LayoutTests/TestExpectations
+++ b/third_party/WebKit/LayoutTests/TestExpectations
@@ -89,6 +89,9 @@
 crbug.com/726075 [ Win ] external/wpt/webvtt/rendering/cues-with-video/processing-model/dom_override_remove_cue_while_paused.html [ Failure ]
 crbug.com/726075 [ Win Debug ] virtual/exotic-color-space/images/color-profile-border-fade.html [ Failure ]
 
+# Fails because the manual test hasn't been automated yet
+crbug.com/762054 external/wpt/cssom-view/scrollBoundaryBehavior-manual.html [ Skip ]
+
 # Fails consistently on WebKit Mac10.10, WebKit Mac10.11 (retina) and mac10.10_blink_rel tryserver, but not on other Mac bots.
 crbug.com/614910 [ Mac ] virtual/gpu-rasterization/images/pixel-crack-image-background-webkit-transform-scale.html [ Pass Failure ]
 
diff --git a/third_party/WebKit/LayoutTests/external/wpt/cssom-view/scrollBoundaryBehavior-manual.html b/third_party/WebKit/LayoutTests/external/wpt/cssom-view/scrollBoundaryBehavior-manual.html
new file mode 100644
index 0000000..efd0043
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/cssom-view/scrollBoundaryBehavior-manual.html
@@ -0,0 +1,151 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<style>
+.outer {
+  height: 400px;
+  width: 1000px;
+  background: white
+}
+.content {
+  height: 600px;
+  width: 1200px;
+}
+#root {
+  overflow: scroll;
+  height: 600px;
+  width: 800px;
+  background: white;
+}
+#container {
+  overflow: scroll;
+}
+#non_scrollable {
+  overflow: none;
+}
+#green {
+  background: repeating-linear-gradient(to bottom right, green 15%, white 30%);
+}
+#blue {
+  background: repeating-linear-gradient(to bottom right, blue 15%, white 30%);
+}
+</style>
+
+<div id='root'>
+  <div id='non_scrollable' class='outer'>
+    <div id='green' class='content'></div>
+  </div>
+  <div id='container' class='outer'>
+    <div id='blue' class='content'></div>
+  </div>
+</div>
+<input type="button" id="btnDone" value="DONE" style="width: 100px; height: 50px;"/>
+<h1>scroll-boundary-behavior</h1>
+<h4>Tests that scroll-boundary-behavior prevents scroll-propagation in the area and direction as specified.</h4>
+<ol>
+  <li id="i1">Make two scrolls on <span style="color: blue">BLUE</span>, in this order: scroll UP (or drag down), then scroll LEFT (or drag right). Scroll (or drag) until nothing is scrolling. Then tap on DONE.</li>
+  <li id="i2">Repeat the same scrolls as in step 1 and then tap on DONE.</li>
+  <li id="i3">Repeat the same scrolls as in step 1 and then tap on DONE.</li>
+  <li id="i4">Make two separate scrolls on <span style="color: green">GREEN</span>, in this order: scroll UP (or drag down), then scroll LEFT (or drag right). Scroll (or drag) until nothing is scrolling. Then tap on DONE.</li>
+</ol>
+
+
+<script>
+const container = document.getElementById('container');
+const non_scrollable = document.getElementById('non_scrollable');
+const root = document.getElementById('root');
+var test = async_test("scroll-boundary-behavior prevents scroll-propagation in the area and direction as specified");
+var instruction1 = document.getElementById("i1");
+var instruction2 = document.getElementById("i2");
+var instruction3 = document.getElementById("i3");
+var instruction4 = document.getElementById("i4");
+
+function setUpForRoot(offset) {
+  root.scrollTop = offset;
+  root.scrollLeft = offset;
+}
+
+function setUpForContainer(offset) {
+  container.scrollTop = offset;
+  container.scrollLeft = offset
+}
+
+function set_boundary_prevents_y() {
+  instruction1.style.color = 'red';
+  instruction1.style.fontWeight = 'bold';
+  container.style.scrollBoundaryBehaviorX = 'auto';
+  container.style.scrollBoundaryBehaviorY = 'none';
+  setUpForRoot(100);
+  setUpForContainer(0);
+}
+
+function verify_y_prevented_and_set_boundary_prevents_x() {
+  instruction1.style.fontWeight = 'normal';
+  instruction2.style.fontWeight = 'bold';
+  test.step(function() {
+    assert_equals(root.scrollTop, 100);
+    assert_equals(root.scrollLeft, 0);
+  }, "scroll-boundary-behavior-y: none should only prevent scroll propagation on y axis.");
+
+  container.style.scrollBoundaryBehaviorX = 'none';
+  container.style.scrollBoundaryBehaviorY = 'auto';
+  setUpForRoot(100);
+  setUpForContainer(0);
+}
+
+function verify_x_prevented_and_set_boundary_allows_inner() {
+  instruction2.style.fontWeight = 'normal';
+  instruction3.style.fontWeight = 'bold';
+  test.step(function() {
+    assert_equals(root.scrollTop, 0);
+    assert_equals(root.scrollLeft, 100);
+  }, "scroll-boundary-behavior-x: none should only prevent scroll propagation on x axis.");
+
+  container.style.scrollBoundaryBehaviorX = 'none';
+  container.style.scrollBoundaryBehaviorY = 'none';
+  setUpForRoot(100);
+  setUpForContainer(100);
+}
+
+function verify_inner_allowed_and_set_nonscrollable_allows_propagation() {
+  instruction1.style.color = 'black';
+  instruction4.style.color = 'red';
+  instruction3.style.fontWeight = 'normal';
+  instruction4.style.fontWeight = 'bold';
+  test.step(function() {
+    assert_equals(container.scrollTop, 0);
+    assert_equals(container.scrollLeft, 0);
+    assert_equals(root.scrollTop, 100);
+    assert_equals(root.scrollLeft, 100);
+  }, "scroll-boundary-behavior should latch the scroll to the inner container.");
+
+  non_scrollable.style.scrollBoundaryBehaviorX = 'none';
+  non_scrollable.style.scrollBoundaryBehaviorY = 'none';
+  setUpForRoot(100);
+}
+
+function verify_non_scrollable_allows_propagation() {
+  test.step(function() {
+    assert_equals(root.scrollLeft, 0);
+    assert_equals(root.scrollTop, 0);
+  }, "scroll-boundary-behavior on non-scrollable area should not affect scroll propagation.");
+  test.done();
+}
+
+var verifyAndSetupForNext = [
+    set_boundary_prevents_y,
+    verify_y_prevented_and_set_boundary_prevents_x,
+    verify_x_prevented_and_set_boundary_allows_inner,
+    verify_inner_allowed_and_set_nonscrollable_allows_propagation,
+    verify_non_scrollable_allows_propagation];
+
+on_event(document.getElementById("btnDone"), "click", function() {
+  if (current_test < verifyAndSetupForNext.length)
+    verifyAndSetupForNext[current_test++]();
+});
+
+var current_test = 0;
+verifyAndSetupForNext[current_test++]();
+
+</script>