DeferredImageDecoder: early-out onGetYUV8Planes when possible

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

Index: third_party/WebKit/Source/platform/graphics/DecodingImageGenerator.h
diff --git a/third_party/WebKit/Source/platform/graphics/DecodingImageGenerator.h b/third_party/WebKit/Source/platform/graphics/DecodingImageGenerator.h
index 9a9ac40b4cbe9e356c656b1bc2edaf935b9225fb..eb2c2da3be34bbd27b2ca211e3a84fe7d8b8812f 100644
--- a/third_party/WebKit/Source/platform/graphics/DecodingImageGenerator.h
+++ b/third_party/WebKit/Source/platform/graphics/DecodingImageGenerator.h
@@ -46,12 +46,13 @@ class PLATFORM_EXPORT DecodingImageGenerator final : public SkImageGenerator {
     USING_FAST_MALLOC(DecodingImageGenerator);
     WTF_MAKE_NONCOPYABLE(DecodingImageGenerator);
 public:
-    static SkImageGenerator* create(SkData*);
-
     DecodingImageGenerator(PassRefPtr<ImageFrameGenerator>, const SkImageInfo&, size_t index);
     ~DecodingImageGenerator() override;
 
     void setGenerationId(size_t id) { m_generationId = id; }
+    void setCanYUVDecode(bool yes) { m_canYUVDecode = yes; }
+
+    static SkImageGenerator* create(SkData*); // Highly unsual access.

[scroggo_chromium, 2015/12/07 16:40:02]

unusual*

Is the goal of this comment to say something like "do not use unless you know
what you're doing?". "Highly unusual access" just seems like a description
(which may cease to be true, unless we enforce it through code review).

Should we discourage using it though? Is there a problem with it?

[Noel Gordon, 2015/12/08 01:40:08]

The goal was just to point it out, to you, since it might have implications for
your work.
I'm not really sure why this API exists, but if you follow the code paths you
might find out why, and whether it has any implications for your work.

Done pointing it out, so I will remove this part of the change, to make git
blame easier for later investigations about the purpose of the unusual API.

 
 protected:
     SkData* onRefEncodedData() override;
@@ -64,6 +65,7 @@ private:
     RefPtr<ImageFrameGenerator> m_frameGenerator;
     size_t m_frameIndex;
     size_t m_generationId;
+    bool m_canYUVDecode;
 };
 
 } // namespace blink