Ignore scroll node when checking whether a chunk can merge.

third_party/WebKit/Source/platform/graphics/paint/GeometryMapper.cpp

 // Copyright 2016 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 "platform/graphics/paint/GeometryMapper.h"
 
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/geometry/LayoutRect.h"
 
 namespace blink {
@@ skipping 69 matching lines @@
                                                        ancestorState, success);
   DCHECK(success);
   return result;
 }
 
 FloatRect GeometryMapper::localToAncestorVisualRectInternal(
     const FloatRect& rect,
     const PropertyTreeState& localState,
     const PropertyTreeState& ancestorState,
     bool& success) {
+  // TODO(wkorman): Consider using PropertyTreeState::equivalentGeometry() so as
+  // to ignore scroll node diff for comparison purposes.
   if (localState == ancestorState) {
     success = true;
     return rect;
   }
 
   const auto& transformMatrix = localToAncestorMatrixInternal(
       localState.transform(), ancestorState.transform(), success);
   if (!success)
     return rect;
 
@@ skipping 234 matching lines @@
     const TransformPaintPropertyNode*,
     const TransformPaintPropertyNode*);
 template const ClipPaintPropertyNode* GeometryMapper::lowestCommonAncestor(
     const ClipPaintPropertyNode*,
     const ClipPaintPropertyNode*);
 template const ScrollPaintPropertyNode* GeometryMapper::lowestCommonAncestor(
     const ScrollPaintPropertyNode*,
     const ScrollPaintPropertyNode*);
 
 }  // namespace blink