Enable compositing for opaque scrolling content on low DPI screens

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

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. 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>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 454 matching lines @@
 
     void setHasHorizontalScrollbar(bool hasScrollbar);
     void setHasVerticalScrollbar(bool hasScrollbar);
 
     void updateScrollCornerStyle();
 
     // See comments on isPointInResizeControl.
     void updateResizerAreaSet();
     void updateResizerStyle();
 
-
     void updateScrollableAreaSet(bool hasOverflow);
 
     void updateCompositingLayersAfterScroll();
 
     PaintLayerScrollableAreaRareData* rareData()
     {
         return m_rareData.get();
     }
 
     PaintLayerScrollableAreaRareData& ensureRareData()
@@ skipping 58 matching lines @@
 #endif
 };
 
 DEFINE_TYPE_CASTS(PaintLayerScrollableArea, ScrollableArea, scrollableArea,
     scrollableArea->isPaintLayerScrollableArea(),
     scrollableArea.isPaintLayerScrollableArea());
 
 } // namespace blink
 
 #endif // LayerScrollableArea_h