Decode GIF image frames on demand.

Source/WebKit/chromium/tests/ImageLayerChromiumTest.cpp

 /*
  * Copyright (C) 2011 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:
  * 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
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 67 matching lines @@
 
     virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame()
     {
         if (m_size.isZero())
             return 0;
 
         return m_nativeImage;
     }
 
     // Stub implementations of pure virtual Image functions.
-    virtual void destroyDecodedData(bool)
+    virtual void destroyDecodedData()
     {
     }
 
     virtual unsigned int decodedSize() const
     {
         return 0u;
     }
 
     virtual void draw(WebCore::GraphicsContext*, const WebCore::FloatRect&,
                       const WebCore::FloatRect&, WebCore::ColorSpace,
@@ skipping 22 matching lines @@
     ASSERT_FALSE(graphicsLayer->contentsLayer());
 
     graphicsLayer->setContentsToImage(opaqueImage.get());
     ASSERT_TRUE(graphicsLayer->contentsLayer()->opaque());
 
     graphicsLayer->setContentsToImage(nonOpaqueImage.get());
     ASSERT_FALSE(graphicsLayer->contentsLayer()->opaque());
 }
 
 } // namespace