Fix paint code so that overlays and views paint their own layers.

third_party/WebKit/Source/core/frame/VisualViewport.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 258 matching lines @@
 
 // Modifies the top of the graphics layer tree to add layers needed to support
 // the inner/outer viewport fixed-position model for pinch zoom. When finished,
 // the tree will look like this (with * denoting added layers):
 //
 // *rootTransformLayer
 //  +- *innerViewportContainerLayer (fixed pos container)
 //  |   +- *overscrollElasticityLayer
 //  |       +- *pageScaleLayer
 //  |           +- *innerViewportScrollLayer
-//  |               +-- overflowControlsHostLayer (root layer)
+//  |               +-- overflowControlsHostLayer (root layer) [ owned by PaintLayerCompositor ]
 //  |                   +-- outerViewportContainerLayer (fixed pos container) [frame container layer in PaintLayerCompositor]
 //  |                   |   +-- outerViewportScrollLayer [frame scroll layer in PaintLayerCompositor]
 //  |                   |       +-- content layers ...
-//  +- horizontalScrollbarLayer
-//  +- verticalScrollbarLayer
-//  +- scroll corner (non-overlay only)
+//  +- horizontalScrollbarLayer [ owned by PaintLayerCompositor ]
+//  +- verticalScrollbarLayer [ owned by PaintLayerCompositor ]
+//  +- scroll corner (non-overlay only) [ owned by PaintLayerCompositor ]
 //
 void VisualViewport::attachToLayerTree(GraphicsLayer* currentLayerTreeRoot, GraphicsLayerFactory* graphicsLayerFactory)
 {
     TRACE_EVENT1("blink", "VisualViewport::attachToLayerTree", "currentLayerTreeRoot", (bool)currentLayerTreeRoot);
     if (!currentLayerTreeRoot) {
         if (m_innerViewportScrollLayer)
             m_innerViewportScrollLayer->removeAllChildren();
         return;
     }
 
@@ skipping 450 matching lines @@
     } else if (graphicsLayer == m_rootTransformLayer) {
         name =  "Root Transform Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink