Expose setting API to set ImageAnimationPolicy(Allowed, Once, None)

Source/platform/graphics/ImageObserver.h

 /*
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
  *
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  *    notice, this list of conditions and the following disclaimer.
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  *
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  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 #ifndef ImageObserver_h
 #define ImageObserver_h
 
 #include "platform/PlatformExport.h"
+#include "platform/graphics/ImageAnimationPolicy.h"
 
 namespace blink {
 
 class Image;
 class IntRect;
 
 // Interface for notification about changes to an image, including decoding,
 // drawing, and animating.
 class PLATFORM_EXPORT ImageObserver {
 protected:
     virtual ~ImageObserver();
 public:
     virtual void decodedSizeChanged(const Image*, int delta) = 0;
     virtual void didDraw(const Image*) = 0;
 
     virtual bool shouldPauseAnimation(const Image*) = 0;
     virtual void animationAdvanced(const Image*) = 0;
+    virtual void imageAnimationPolicy(const Image*, ImageAnimationPolicy&) = 0;
 
     virtual void changedInRect(const Image*, const IntRect&) = 0;
 };
 
 } // namespace blink
 
 #endif