Adding blink side flag that allows disabling YUV decoding

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 31 matching lines @@
 //
 // This class does not own an ImageDecode. It does not own encoded data. It serves
 // as and adapter to ImageFrameGenerator which actually performs decoding.
 class DecodingImageGenerator FINAL : public SkImageGenerator {
 public:
     DecodingImageGenerator(PassRefPtr<ImageFrameGenerator>, const SkImageInfo&, size_t index);
     virtual ~DecodingImageGenerator();
 
     void setGenerationId(size_t id) { m_generationId = id; }
 
+    static void setYUVDecodingEnabled(bool);

[Stephen White, 2014/09/26 19:21:14]

Since this doesn't really decode YUV at all, let's make it setYUVOutputEnabled?

+    static bool yuvDecodingEnabled();
+
 protected:
     virtual SkData* onRefEncodedData() OVERRIDE;
     virtual bool onGetInfo(SkImageInfo*) OVERRIDE;
     virtual bool onGetPixels(const SkImageInfo&, void* pixels, size_t rowBytes, SkPMColor ctable[], int* ctableCount) OVERRIDE;
     virtual bool onGetYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3], SkYUVColorSpace*) OVERRIDE;
 
 private:
     RefPtr<ImageFrameGenerator> m_frameGenerator;
     SkImageInfo m_imageInfo;
     size_t m_frameIndex;
     size_t m_generationId;
+
+    static bool s_yuvDecodingEnabled;
 };
 
 } // namespace blink
 
 #endif // DecodingImageGenerator_h_