Skip PaintPhaseDescendantBlockBackgroundsOnly phase if possible

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 647 matching lines @@
 
     // Used to skip PaintPhaseDescendantOutlinesOnly for layers that have never had descendant outlines.
     // Once it's set we never clear it because it's not easy to track if all outlines have been removed.
     bool needsPaintPhaseDescendantOutlines() const { return m_needsPaintPhaseDescendantOutlines; }
     void setNeedsPaintPhaseDescendantOutlines() { ASSERT(isSelfPaintingLayer()); m_needsPaintPhaseDescendantOutlines = true; }
 
     // Similar to above, but for PaintPhaseFloat.
     bool needsPaintPhaseFloat() const { return m_needsPaintPhaseFloat; }
     void setNeedsPaintPhaseFloat() { ASSERT(isSelfPaintingLayer()); m_needsPaintPhaseFloat = true; }
 
+    bool needsPaintPhaseDescendantBlockBackgrounds() const { return m_needsPaintPhaseDescendantBlockBackgrounds; }
+    void setNeedsPaintPhaseDescendantBlockBackgrounds() { ASSERT(isSelfPaintingLayer()); m_needsPaintPhaseDescendantBlockBackgrounds = true; }
+
     PaintTiming* paintTiming();
 
     ClipRectsCache* clipRectsCache() const { return m_clipRectsCache.get(); }
     ClipRectsCache& ensureClipRectsCache() const
     {
         if (!m_clipRectsCache)
             m_clipRectsCache = adoptPtr(new ClipRectsCache);
         return *m_clipRectsCache;
     }
     void clearClipRectsCache() const { m_clipRectsCache.clear(); }
@@ skipping 128 matching lines @@
 
     // True if this layout layer just lost its grouped mapping due to the CompositedLayerMapping being destroyed,
     // and we don't yet know to what graphics layer this Layer will be assigned.
     unsigned m_lostGroupedMapping : 1;
 
     unsigned m_needsRepaint : 1;
     unsigned m_previousPaintResult : 1; // PaintLayerPainter::PaintResult
 
     unsigned m_needsPaintPhaseDescendantOutlines : 1;
     unsigned m_needsPaintPhaseFloat : 1;
+    unsigned m_needsPaintPhaseDescendantBlockBackgrounds : 1;
 
     // These bitfields are part of ancestor/descendant dependent compositing inputs.
     unsigned m_hasDescendantWithClipPath : 1;
     unsigned m_hasNonIsolatedDescendantWithBlendMode : 1;
     unsigned m_hasAncestorWithClipPath : 1;
 
     LayoutBoxModelObject* m_layoutObject;
 
     PaintLayer* m_parent;
     PaintLayer* m_previous;
@@ skipping 32 matching lines @@
 
 } // 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