DO NOT COMMIT: Experimental removal of encoded image data

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

 /*
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 52 matching lines @@
     // earlier frame may require more work to be done, e.g. redecoding the image
     // from the beginning.
     //
     // Implementations may elect to preserve more frames than the one requested
     // here if doing so is likely to save CPU time in the future, but will pay
     // an increased memory cost to do so.
     //
     // Returns the number of bytes of frame data actually cleared.
     size_t clearCacheExceptFrame(size_t);
 
+    bool clear();
     PassRefPtr<SharedBuffer> data();
     // Returns false when the decoder layer rejects the data.
     bool setData(PassRefPtr<SharedBuffer> data, bool allDataReceived);
     String filenameExtension() const;
 
     bool isSizeAvailable();
     bool hasColorProfile() const;
     IntSize size(RespectImageOrientationEnum = DoNotRespectImageOrientation) const;
     IntSize frameSizeAtIndex(size_t, RespectImageOrientationEnum = DoNotRespectImageOrientation) const;
 
     bool getHotSpot(IntPoint&) const;
     int repetitionCount();
 
     size_t frameCount() const;
 
     // Attempts to create the requested frame.
     sk_sp<SkImage> createFrameAtIndex(size_t);
 
     float frameDurationAtIndex(size_t) const;
     bool frameHasAlphaAtIndex(size_t) const; // Whether or not the frame actually used any alpha.
     bool frameIsCompleteAtIndex(size_t) const; // Whether or not the frame is fully received.
     ImageOrientation orientationAtIndex(size_t) const; // EXIF image orientation
 
     // Returns the number of bytes in the decoded frame. May return 0 if the
     // frame has not yet begun to decode.
     size_t frameBytesAtIndex(size_t) const;
 
+    bool isBufferCleared() const { return m_decoder ? m_decoder->isBufferCleared() : false; }
+
 private:
     std::unique_ptr<DeferredImageDecoder> m_decoder;
 };
 
 } // namespace blink
 
 #endif