Refactor PaintChunkProperties to use PropertyTreeState

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

Index: third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.h
diff --git a/third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.h b/third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.h
index 6a6f1e2eabc3cdfe92fe78ec554645933f14b608..955a8ccea9cbc734c398302d83ed9f005123fbc9 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.h
@@ -74,6 +74,12 @@ class PropertyTreeState {
   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