DO NOT COMMIT: Experimental removal of encoded image data

third_party/WebKit/Source/platform/graphics/Image.h

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, 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
@@ skipping 95 matching lines @@
         SizeAvailable,
         SizeUnavailable
     };
     virtual SizeAvailability setData(PassRefPtr<SharedBuffer> data, bool allDataReceived);
     virtual SizeAvailability dataChanged(bool /*allDataReceived*/) { return SizeUnavailable; }
 
     virtual String filenameExtension() const { return String(); } // null string if unknown
 
     virtual void destroyDecodedData() = 0;
 
+    virtual bool clear() { return false; }
     virtual PassRefPtr<SharedBuffer> data() { return m_encodedImageData; }
 
     // Animation begins whenever someone draws the image, so startAnimation() is not normally called.
     // It will automatically pause once all observers no longer want to render the image anywhere.
     enum CatchUpAnimation { DoNotCatchUp, CatchUp };
     virtual void startAnimation(CatchUpAnimation = CatchUp) { }
     virtual void resetAnimation() {}
 
     // True if this image can potentially animate.
     virtual bool maybeAnimated() { return false; }
@@ skipping 60 matching lines @@
     UntracedMember<ImageObserver> m_imageObserver;
     bool m_imageObserverDisabled;
 };
 
 #define DEFINE_IMAGE_TYPE_CASTS(typeName) \
     DEFINE_TYPE_CASTS(typeName, Image, image, image->is##typeName(), image.is##typeName())
 
 } // namespace blink
 
 #endif