Reland change to enable deferred image decoding for animated GIFs

Source/core/platform/graphics/chromium/DeferredImageDecoder.h

 /*
  * Copyright (C) 2012 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 12 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DeferredImageDecoder_h
 #define DeferredImageDecoder_h
 
 #include "SkBitmap.h"
 #include "core/platform/graphics/ImageSource.h"
 #include "core/platform/graphics/IntSize.h"
 #include "core/platform/image-decoders/ImageDecoder.h"
-#include <wtf/Forward.h>
+#include "wtf/Forward.h"
+#include "wtf/OwnPtr.h"
+#include "wtf/Vector.h"
 
 namespace WebCore {
 
 class ImageFrameGenerator;
 class SharedBuffer;
 
 class DeferredImageDecoder {
 public:
     ~DeferredImageDecoder();
     static PassOwnPtr<DeferredImageDecoder> create(const SharedBuffer& data, ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption);
@@ skipping 20 matching lines @@
     size_t clearCacheExceptFrame(size_t);
     bool frameHasAlphaAtIndex(size_t index) const;
     bool frameIsCompleteAtIndex(size_t) const;
     float frameDurationAtIndex(size_t) const;
     unsigned frameBytesAtIndex(size_t index) const;
     ImageOrientation orientation() const;
     bool hotSpot(IntPoint&) const;
 
 private:
     explicit DeferredImageDecoder(PassOwnPtr<ImageDecoder> actualDecoder);
-    SkBitmap createLazyDecodingBitmap();
+    void prepareLazyDecodedFrames();
+    SkBitmap createLazyDecodingBitmap(size_t index);
+    void activateLazyDecoding();
     void setData(PassRefPtr<SharedBuffer>, bool allDataReceived);
 
     RefPtr<SharedBuffer> m_data;
     bool m_allDataReceived;
     OwnPtr<ImageDecoder> m_actualDecoder;
 
     String m_filenameExtension;
     IntSize m_size;
     ImageOrientation m_orientation;
+    int m_repetitionCount;
 
-    ImageFrame m_lazyDecodedFrame;
+    Vector<OwnPtr<ImageFrame> > m_lazyDecodedFrames;
     RefPtr<ImageFrameGenerator> m_frameGenerator;
 
     static bool s_enabled;
 };
 
 } // namespace WebCore
 
 #endif