Add onIsEncoded to image decoders.

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

 /*
  * Copyright (C) 2013 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
@@ skipping 47 matching lines @@
                          const SkImageInfo&,
                          PassRefPtr<SegmentReader>,
                          bool allDataReceived,
                          size_t index,
                          uint32_t uniqueID = kNeedNewImageUniqueID);
   ~DecodingImageGenerator() override;
 
   void setCanYUVDecode(bool yes) { m_canYUVDecode = yes; }
 
  protected:
+  bool onIsEncoded() const override;
+
   SkData* onRefEncodedData(GrContext* ctx) override;
 
   bool onGetPixels(const SkImageInfo&,
                    void* pixels,
                    size_t rowBytes,
                    SkPMColor table[],
                    int* tableCount) override;
 
   bool onQueryYUV8(SkYUVSizeInfo*, SkYUVColorSpace*) const override;
 
   bool onGetYUV8Planes(const SkYUVSizeInfo&, void* planes[3]) override;
 
  private:
   RefPtr<ImageFrameGenerator> m_frameGenerator;
   const RefPtr<SegmentReader> m_data;  // Data source.
   const bool m_allDataReceived;
   const size_t m_frameIndex;
   bool m_canYUVDecode;
 };
 
 }  // namespace blink
 
 #endif  // DecodingImageGenerator_h_