Add onIsEncoded to image decoders.

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

 /*
  * Copyright (C) 2012 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 34 matching lines @@
     uint32_t uniqueID)
     : SkImageGenerator(info, uniqueID),
       m_frameGenerator(frameGenerator),
       m_data(data),
       m_allDataReceived(allDataReceived),
       m_frameIndex(index),
       m_canYUVDecode(false) {}
 
 DecodingImageGenerator::~DecodingImageGenerator() {}
 
+bool DecodingImageGenerator::onIsEncoded() const {
+  return true;
+}
+
 SkData* DecodingImageGenerator::onRefEncodedData(GrContext* ctx) {
   TRACE_EVENT0("blink", "DecodingImageGenerator::refEncodedData");
 
   // The GPU only wants the data if it has all been received, since the GPU
   // only wants a complete texture. getAsSkData() may require copying, so
   // skip it and just return nullptr to avoid a slowdown. (See
   // crbug.com/568016 for details about such a slowdown.)
   // TODO (scroggo): Stop relying on the internal knowledge of how Skia uses
   // this. skbug.com/5485
   if (ctx && !m_allDataReceived)
@@ skipping 88 matching lines @@
   RefPtr<ImageFrameGenerator> frame = ImageFrameGenerator::create(
       SkISize::Make(size.width(), size.height()), false);
   if (!frame)
     return nullptr;
 
   return new DecodingImageGenerator(frame, info, segmentReader.release(), true,
                                     0);
 }
 
 }  // namespace blink