Put rare PaintLayer fields into PaintLayerRareData

third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.h

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 92 matching lines @@
 
     void willDestroyScrollableArea(ScrollableArea*);
     // Returns true if the coordinator handled this change.
     bool scrollableAreaScrollLayerDidChange(ScrollableArea*);
     void scrollableAreaScrollbarLayerDidChange(ScrollableArea*, ScrollbarOrientation);
     void setLayerIsContainerForFixedPositionLayers(GraphicsLayer*, bool);
     void updateLayerPositionConstraint(PaintLayer*);
     void touchEventTargetRectsDidChange();
     void willDestroyLayer(PaintLayer*);
 
-    void updateScrollParentForGraphicsLayer(GraphicsLayer* child, PaintLayer* parent);
-    void updateClipParentForGraphicsLayer(GraphicsLayer* child, PaintLayer* parent);
+    void updateScrollParentForGraphicsLayer(GraphicsLayer* child, const PaintLayer* parent);
+    void updateClipParentForGraphicsLayer(GraphicsLayer* child, const PaintLayer* parent);
 
     static String mainThreadScrollingReasonsAsText(MainThreadScrollingReasons);
     String mainThreadScrollingReasonsAsText() const;
     Region computeShouldHandleScrollGestureOnMainThreadRegion(const LocalFrame*, const IntPoint& frameLocation) const;
 
     void updateTouchEventTargetRectsIfNeeded();
 
     // For testing purposes only. This ScrollingCoordinator is reused between layout test, and must be reset
     // for the results to be valid.
     void reset();
@@ skipping 36 matching lines @@
     ScrollbarMap m_verticalScrollbars;
     HashSet<const PaintLayer*> m_layersWithTouchRects;
     bool m_wasFrameScrollable;
 
     MainThreadScrollingReasons m_lastMainThreadScrollingReasons;
 };
 
 } // namespace blink
 
 #endif // ScrollingCoordinator_h