Add CanvasSurfaceLayerBridge

third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. 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.
@@ skipping 233 matching lines @@
     if (m_context->is3d()) {
         updateExternallyAllocatedMemory();
     }
     setNeedsCompositingUpdate();
 
     return m_context.get();
 }
 
 bool HTMLCanvasElement::shouldBeDirectComposited() const
 {
-    return (m_context && m_context->isAccelerated()) || (hasImageBuffer() && buffer()->isExpensiveToPaint());
+    return (m_context && m_context->isAccelerated()) || (hasImageBuffer() && buffer()->isExpensiveToPaint()) || (!!m_surfaceLayerBridge);
 }
 
 bool HTMLCanvasElement::isPaintable() const
 {
     if (!m_context)
         return canCreateImageBuffer(size());
     return buffer();
 }
 
 void HTMLCanvasElement::didDraw(const FloatRect& rect)
@@ skipping 860 matching lines @@
     return std::make_pair(nullptr, String());
 }
 
 String HTMLCanvasElement::getIdFromControl(const Element* element)
 {
     if (m_context)
         return m_context->getIdFromControl(element);
     return String();
 }
 
+void HTMLCanvasElement::createSurfaceLayerBridge()
+{
+    m_surfaceLayerBridge = adoptPtr(new CanvasSurfaceLayerBridge());
+}
+
 } // namespace blink