move to new ImageGenerator API

Source/platform/graphics/DecodingImageGenerator.h

Index: Source/platform/graphics/DecodingImageGenerator.h
diff --git a/Source/platform/graphics/DecodingImageGenerator.h b/Source/platform/graphics/DecodingImageGenerator.h
index 145c6457ded2769158a4de6c831af935b68ef953..fe5cb00b60dc3e0bdaf92b05142e94ad519763c2 100644
--- a/Source/platform/graphics/DecodingImageGenerator.h
+++ b/Source/platform/graphics/DecodingImageGenerator.h
@@ -47,13 +47,13 @@ public:
     DecodingImageGenerator(PassRefPtr<ImageFrameGenerator>, const SkImageInfo&, size_t index);
     virtual ~DecodingImageGenerator();
 
-    // SkImageGenerator implementation.
-    virtual SkData* refEncodedData() OVERRIDE;
-    virtual bool getInfo(SkImageInfo*) OVERRIDE;
-    virtual bool getPixels(const SkImageInfo&, void* pixels, size_t rowBytes) OVERRIDE;
-
     void setGenerationId(size_t id) { m_generationId = id; }
 
+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;
+
 private:
     RefPtr<ImageFrameGenerator> m_frameGenerator;
     SkImageInfo m_imageInfo;