Eliminate copies of encoded image data

third_party/WebKit/Source/platform/image-decoders/DataSegmentReader.h

Index: third_party/WebKit/Source/platform/image-decoders/DataSegmentReader.h
diff --git a/third_party/WebKit/Source/platform/image-decoders/DataSegmentReader.h b/third_party/WebKit/Source/platform/image-decoders/DataSegmentReader.h
new file mode 100644
index 0000000000000000000000000000000000000000..ed8441c231bb1eec8c0a0ca1e7a7973b73fe33fb
--- /dev/null
+++ b/third_party/WebKit/Source/platform/image-decoders/DataSegmentReader.h
@@ -0,0 +1,29 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef DataSegmentReader_h
+#define DataSegmentReader_h
+
+#include "platform/image-decoders/SegmentReader.h"
+#include "skia/ext/refptr.h"
+#include "third_party/skia/include/core/SkData.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/PassRefPtr.h"
+
+namespace blink {
+
+// Interface for ImageDecoder to read an SkData
+class DataSegmentReader final : public SegmentReader {
+    WTF_MAKE_NONCOPYABLE(DataSegmentReader);
+public:
+    DataSegmentReader(PassRefPtr<SkData>);
+    size_t size() const override;
+    size_t getSomeData(const char*& data, size_t position) const override;
+    PassRefPtr<SkData> getAsSkData() const override;
+private:
+    skia::RefPtr<SkData> m_data;
+};
+
+} // namespace blink
+#endif // DataSegmentReader_h