Reland of Client side display item cache flag

third_party/WebKit/Source/core/paint/PaintLayer.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
@@ skipping 868 matching lines @@
 
     mutable OwnPtr<ClipRectsCache> m_clipRectsCache;
 
     OwnPtr<PaintLayerStackingNode> m_stackingNode;
 
     IntSize m_previousScrollOffsetAccumulationForPainting;
     RefPtr<ClipRects> m_previousPaintingClipRects;
     LayoutRect m_previousPaintDirtyRect;
 
     OwnPtr<PaintLayerRareData> m_rareData;
+
+    DISPLAY_ITEM_CACHE_STATUS_IMPLEMENTATION
 };
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showLayerTree(const blink::PaintLayer*);
 void showLayerTree(const blink::LayoutObject*);
 #endif
 
 #endif // Layer_h