Initial implementation of display list backed 2D canvases

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 30 matching lines @@
 #include "core/html/canvas/CanvasRenderingContext2D.h"
 #include "core/html/canvas/WebGLContextAttributes.h"
 #include "core/html/canvas/WebGLContextEvent.h"
 #include "core/html/canvas/WebGLRenderingContext.h"
 #include "core/rendering/RenderHTMLCanvas.h"
 #include "platform/MIMETypeRegistry.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/graphics/Canvas2DImageBufferSurface.h"
 #include "platform/graphics/GraphicsContextStateSaver.h"
 #include "platform/graphics/ImageBuffer.h"
+#include "platform/graphics/RecordingImageBufferSurface.h"
 #include "platform/graphics/UnacceleratedImageBufferSurface.h"
 #include "platform/graphics/gpu/WebGLImageBufferSurface.h"
 #include "platform/transforms/AffineTransform.h"
 #include "public/platform/Platform.h"
 #include <math.h>
 #include <v8.h>
 
 namespace blink {
 
 using namespace HTMLNames;
@@ skipping 385 matching lines @@
 }
 
 PassOwnPtr<ImageBufferSurface> HTMLCanvasElement::createImageBufferSurface(const IntSize& deviceSize, int* msaaSampleCount)
 {
     OpacityMode opacityMode = !m_context || m_context->hasAlpha() ? NonOpaque : Opaque;
 
     *msaaSampleCount = 0;
     if (is3D())
         return adoptPtr(new WebGLImageBufferSurface(size(), opacityMode));
 
+    if (RuntimeEnabledFeatures::displayList2dCanvasEnabled()) {
+        OwnPtr<ImageBufferSurface> surface = adoptPtr(new RecordingImageBufferSurface(size(), opacityMode));
+        if (surface->isValid())
+            return surface.release();
+    }
+
     if (shouldAccelerate(deviceSize)) {
         if (document().settings())
             *msaaSampleCount = document().settings()->accelerated2dCanvasMSAASampleCount();
         OwnPtr<ImageBufferSurface> surface = adoptPtr(new Canvas2DImageBufferSurface(size(), opacityMode, *msaaSampleCount));
         if (surface->isValid())
             return surface.release();
     }
 
     return adoptPtr(new UnacceleratedImageBufferSurface(size(), opacityMode));
 }
@@ skipping 240 matching lines @@
 {
     return !originClean();
 }
 
 FloatSize HTMLCanvasElement::sourceSize() const
 {
     return FloatSize(width(), height());
 }
 
 }