Add ImageResource update bitmap images api

Source/platform/graphics/BitmapImage.h

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2008-2009 Torch Mobile, Inc.
  *
  * 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 65 matching lines @@
     // automatically pause once all observers no longer want to render the image anywhere.
     virtual void stopAnimation() OVERRIDE;
     virtual void resetAnimation() OVERRIDE;
     virtual bool maybeAnimated() OVERRIDE;
 
     virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame() OVERRIDE;
     virtual PassRefPtr<Image> imageForDefaultFrame() OVERRIDE;
     virtual bool currentFrameKnownToBeOpaque() OVERRIDE;
 
     ImageOrientation currentFrameOrientation();
+    void resetDecoder();
 
 #if ENABLE(ASSERT)
     virtual bool notSolidColor() OVERRIDE;
 #endif
 
 private:
     friend class BitmapImageTest;
 
-    void resetDecoder();
     void updateSize() const;
 
 protected:
     enum RepetitionCountStatus {
       Unknown,    // We haven't checked the source's repetition count.
       Uncertain,  // We have a repetition count, but it might be wrong (some GIFs have a count after the image data, and will report "loop once" until all data has been decoded).
       Certain     // The repetition count is known to be correct.
     };
 
     BitmapImage(PassRefPtr<NativeImageSkia>, ImageObserver* = 0);
@@ skipping 85 matching lines @@
     bool m_sizeAvailable : 1; // Whether or not we can obtain the size of the first image frame yet from ImageIO.
     mutable bool m_hasUniformFrameSize : 1;
     mutable bool m_haveFrameCount : 1;
 };
 
 DEFINE_IMAGE_TYPE_CASTS(BitmapImage);
 
 } // namespace blink
 
 #endif