Revert "Correctly initialize and test SnapContainerData in cc."

This reverts commit 37061f87.

Reason for revert:
The layout tests added by this CL is failing on the CL:
https://ci.chromium.org/buildbot/chromium.webkit/WebKit%20Win10/37804

Original change's description:
> Correctly initialize and test SnapContainerData in cc.
> 
> This patch initializes the rect_ field in SnapContainerData in copy
> constructor and move constructor. Fixing a snapping issue in the
> composited pages.
> 
> We also adds external/wpt/css/css-scroll-snap/ to the virtual/threaded
> test suite so that they are tested with the composited cases.
> 
> snap-at-user-scroll-end-manual-automation.js calls
> mouseClickInTarget() of pointerevent_common_input.js. That method
> invokes programmatic scrolls. The test was written before programmatic
> scroll snapping was implemented so it worked at that time. However,
> with programmatic scroll snapping implemented, it will always snap
> in mouseClickIntarget() and cannot test whether the user scroll snaps.
> This patch adds a parameter shouldScrollToTarget to mouseClickInTarget
> to avoid invoking programmatic scrolls in the test.
> 
> This patch also checks nullptr for layout_box in
> ScrollManager::SnapAtGestureScrollEnd() to fix a crash.
> 
> Bug: 862406, 862571
> Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
> Change-Id: I6a53818cf74421a4100ad6f908158abf302a5b8e
> Reviewed-on: https://chromium-review.googlesource.com/1132386
> Commit-Queue: Sandra Sun <sunyunjia@chromium.org>
> Reviewed-by: Majid Valipour <majidvp@chromium.org>
> Reviewed-by: Robert Flack <flackr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#574781}

TBR=flackr@chromium.org,majidvp@chromium.org,sunyunjia@chromium.org

Change-Id: I55c77c05c0381c8ac638bd106d2d18b1b4332745
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 862406, 862571
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Reviewed-on: https://chromium-review.googlesource.com/1136171Reviewed-by: Taiju Tsuiki <tzik@chromium.org>
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574825}

cc/input/scroll_snap_data.cc

@@ -73,15 +73,24 @@ SnapContainerData::SnapContainerData(ScrollSnapType type,
 
 SnapContainerData::SnapContainerData(const SnapContainerData& other) = default;
 
-SnapContainerData::SnapContainerData(SnapContainerData&& other) = default;
+SnapContainerData::SnapContainerData(SnapContainerData&& other)
+    : scroll_snap_type_(other.scroll_snap_type_),
+      max_position_(other.max_position_),
+      proximity_range_(other.proximity_range_),
+      snap_area_list_(std::move(other.snap_area_list_)) {}
 
 SnapContainerData::~SnapContainerData() = default;
 
 SnapContainerData& SnapContainerData::operator=(
     const SnapContainerData& other) = default;
 
-SnapContainerData& SnapContainerData::operator=(SnapContainerData&& other) =
-    default;
+SnapContainerData& SnapContainerData::operator=(SnapContainerData&& other) {
+  scroll_snap_type_ = other.scroll_snap_type_;
+  max_position_ = other.max_position_;
+  proximity_range_ = other.proximity_range_;
+  snap_area_list_ = std::move(other.snap_area_list_);
+  return *this;
+}
 
 void SnapContainerData::AddSnapAreaData(SnapAreaData snap_area_data) {
   snap_area_list_.push_back(snap_area_data);

third_party/WebKit/LayoutTests/VirtualTestSuites

@@ -34,11 +34,6 @@
     "base": "http/tests/worklet",
     "args": ["--enable-threaded-compositing"]
   },
-  {
-    "prefix": "threaded",
-    "base": "external/wpt/css/css-scroll-snap",
-    "args": ["--enable-threaded-compositing"]
-  },
   {
     "prefix": "threaded",
     "base": "compositing/webgl",

third_party/WebKit/LayoutTests/external/wpt/css/css-scroll-snap/snap-at-user-scroll-end-manual.html

@@ -45,7 +45,6 @@ body {
 </div>
 
 <script>
-var snap_test = async_test('Tests that window should snap at user scroll end.');
 var body = document.body;
 var button = document.getElementById("btn");
 var target = document.getElementById("target");
@@ -81,7 +80,7 @@ button.onclick = function() {
   // To make the test result visible.
   var content = document.getElementById("content");
   body.removeChild(content);
-  snap_test.done();
+  done();
 }
 
-</script>
+</script>
\ No newline at end of file

third_party/WebKit/LayoutTests/external/wpt_automation/css/css-scroll-snap/snap-at-user-scroll-end-manual-automation.js

@@ -36,10 +36,9 @@ function waitForAnimationEnd() {
 }
 
 function inject_input() {
-  return smoothScroll(100, 20, 20, 'downright', 4000).then(() => {
+  return smoothScroll(2, 20, 20, 'downright', 4000).then(() => {
     return waitForAnimationEnd();
   }).then(() => {
-    return mouseClickInTarget('#btn', undefined, 'left',
-        /* shouldScrollToTarget = */ false);
+    return mouseClickInTarget('#btn');
   });
-}
+}
\ No newline at end of file

third_party/WebKit/LayoutTests/external/wpt_automation/pointerevents/pointerevent_common_input.js

@@ -107,7 +107,7 @@ function mouseChordedButtonPress(targetSelector) {
   });
 }
 
-function mouseClickInTarget(targetSelector, targetFrame, button, shouldScrollToTarget = true) {
+function mouseClickInTarget(targetSelector, targetFrame, button) {
   var targetDocument = document;
   var frameLeft = 0;
   var frameTop = 0;
@@ -122,8 +122,7 @@ function mouseClickInTarget(targetSelector, targetFrame, button, shouldScrollToT
   }
   return new Promise(function(resolve, reject) {
     if (window.chrome && chrome.gpuBenchmarking) {
-      if (shouldScrollToTarget)
-        scrollPageIfNeeded(targetSelector, targetDocument);
+      scrollPageIfNeeded(targetSelector, targetDocument);
       var target = targetDocument.querySelector(targetSelector);
       var targetRect = target.getBoundingClientRect();
       var xPosition = frameLeft + targetRect.left + boundaryOffset;

third_party/WebKit/LayoutTests/virtual/threaded/external/wpt/css/css-scroll-snap/README.txt

-# This suite runs the test in external/wpt/css/css-scroll-snap/ with
-# --enable-threaded-compositing
\ No newline at end of file

third_party/blink/renderer/core/input/scroll_manager.cc

@@ -628,10 +628,10 @@ void ScrollManager::SnapAtGestureScrollEnd() {
     return;
   SnapCoordinator* snap_coordinator =
       frame_->GetDocument()->GetSnapCoordinator();
-  LayoutBox* layout_box = LayoutBoxForSnapping();
-  if (!snap_coordinator || !layout_box)
+  if (!snap_coordinator)
     return;
 
+  LayoutBox* layout_box = LayoutBoxForSnapping();
   snap_coordinator->PerformSnapping(*layout_box,
                                     did_scroll_x_for_scroll_gesture_,
                                     did_scroll_y_for_scroll_gesture_);