Walk render tree instead of render layers for paint.

sky/engine/core/rendering/RenderLineBoxList.h

 /*
  * Copyright (C) 2009 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
@@ skipping 45 matching lines @@
     void deleteLineBoxTree();
     void deleteLineBoxes();
 
     void extractLineBox(InlineFlowBox*);
     void attachLineBox(InlineFlowBox*);
     void removeLineBox(InlineFlowBox*);
 
     void dirtyLineBoxes();
     void dirtyLinesFromChangedChild(RenderObject* parent, RenderObject* child);
 
-    void paint(RenderBoxModelObject*, PaintInfo&, const LayoutPoint&) const;
+    void paint(RenderBoxModelObject*, PaintInfo&, const LayoutPoint&, Vector<RenderBox*>& layers) const;
     bool hitTest(RenderBoxModelObject*, const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) const;
 
 private:
     bool anyLineIntersectsRect(RenderBoxModelObject*, const LayoutRect&, const LayoutPoint&) const;
     bool lineIntersectsDirtyRect(RenderBoxModelObject*, InlineFlowBox*, const PaintInfo&, const LayoutPoint&) const;
     bool rangeIntersectsRect(RenderBoxModelObject*, LayoutUnit logicalTop, LayoutUnit logicalBottom, const LayoutRect&, const LayoutPoint&) const;
 
     // For block flows, each box represents the root inline box for a line in the
     // paragraph.
     // For inline flows, each box represents a portion of that inline.
     InlineFlowBox* m_firstLineBox;
     InlineFlowBox* m_lastLineBox;
 };
 
 
 #if !ENABLE(ASSERT)
 inline void RenderLineBoxList::checkConsistency() const
 {
 }
 #endif
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_RENDERING_RENDERLINEBOXLIST_H_