Eliminate copies of encoded image data

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 64e08953cd90d2b09aaa2e1b7a71a1eee451c9fe..5f77df59262768ff339ca187a15a9834ea4a431f 100644
--- a/third_party/WebKit/Source/platform/graphics/DecodingImageGenerator.h
+++ b/third_party/WebKit/Source/platform/graphics/DecodingImageGenerator.h
@@ -27,10 +27,12 @@
 #define DecodingImageGenerator_h
 
 #include "platform/PlatformExport.h"
+#include "platform/image-decoders/SegmentReader.h"
 #include "third_party/skia/include/core/SkImageGenerator.h"
 #include "third_party/skia/include/core/SkImageInfo.h"
 #include "wtf/Allocator.h"
 #include "wtf/Noncopyable.h"
+#include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 
 class SkData;
@@ -48,7 +50,7 @@ class PLATFORM_EXPORT DecodingImageGenerator final : public SkImageGenerator {
 public:
     static SkImageGenerator* create(SkData*);
 
-    DecodingImageGenerator(PassRefPtr<ImageFrameGenerator>, const SkImageInfo&, size_t index);
+    DecodingImageGenerator(PassRefPtr<ImageFrameGenerator>, const SkImageInfo&, PassRefPtr<SegmentReader>, bool allDataReceived, size_t index);
     ~DecodingImageGenerator() override;
 
     void setGenerationId(size_t id) { m_generationId = id; }
@@ -63,7 +65,9 @@ protected:
 
 private:
     RefPtr<ImageFrameGenerator> m_frameGenerator;
-    size_t m_frameIndex;
+    const RefPtr<SegmentReader> m_data; // Data source.
+    const bool m_allDataReceived;
+    const size_t m_frameIndex;
     size_t m_generationId;
     bool m_canYUVDecode;
 };