Ignore scroll node when checking whether a chunk can merge.

third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.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/PropertyTreeState.h"
 
 #include "platform/graphics/paint/GeometryMapper.h"
 
 namespace blink {
 
@@ skipping 41 matching lines @@
 #endif
   if (effect()->compositorElementId())
     return effect()->compositorElementId();
   if (scroll()->compositorElementId())
     return scroll()->compositorElementId();
   if (transform()->compositorElementId())
     return transform()->compositorElementId();
   return CompositorElementId();
 }
 
+bool PropertyTreeState::equivalentGeometry(
+    const PropertyTreeState& other) const {
+  return transform() == other.transform() && clip() == other.clip() &&
+         effect() == other.effect();
+}
+
 PropertyTreeState::InnermostNode PropertyTreeState::innermostNode() const {
   // TODO(chrishtr): this is very inefficient when innermostNode() is called
   // repeatedly.
   bool clipTransformStrictAncestorOfTransform =
       m_clip->localTransformSpace() != m_transform.get() &&
       isAncestorOf<TransformPaintPropertyNode>(m_clip->localTransformSpace(),
                                                m_transform.get());
   bool effectTransformStrictAncestorOfTransform =
       m_effect->localTransformSpace() != m_transform.get() &&
       isAncestorOf<TransformPaintPropertyNode>(m_effect->localTransformSpace(),
@@ skipping 34 matching lines @@
 #if DCHECK_IS_ON()
 
 String PropertyTreeState::toTreeString() const {
   return transform()->toTreeString() + "\n" + clip()->toTreeString() + "\n" +
          effect()->toTreeString() + "\n" + scroll()->toTreeString();
 }
 
 #endif
 
 }  // namespace blink