Refactor PaintChunkProperties to use PropertyTreeState

third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.h

 // 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.
 
 #ifndef PropertyTreeState_h
 #define PropertyTreeState_h
 
 #include "platform/graphics/paint/ClipPaintPropertyNode.h"
 #include "platform/graphics/paint/EffectPaintPropertyNode.h"
 #include "platform/graphics/paint/ScrollPaintPropertyNode.h"
@@ skipping 56 matching lines @@
     m_scroll = node;
     DCHECK(!node->hasOneRef());
   }
 
  private:
   RefPtr<const TransformPaintPropertyNode> m_transform;
   RefPtr<const ClipPaintPropertyNode> m_clip;
   RefPtr<const EffectPaintPropertyNode> m_effect;
   RefPtr<const ScrollPaintPropertyNode> m_scroll;
 };
+
+inline bool operator==(const PropertyTreeState& a, const PropertyTreeState& b) {
+  return a.transform() == b.transform() && a.clip() == b.clip() &&
+         a.effect() == b.effect() && a.scroll() == b.scroll();
+}
+
 }  // namespace blink
 
 #endif  // PropertyTreeState_h