Remove redundant reading and writing of data about SharedBuffer.

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

 /*
  * Copyright (C) 2012 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 10 matching lines @@
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DeferredImageDecoder_h
 #define DeferredImageDecoder_h
 
 #include <memory>
 #include "platform/PlatformExport.h"
+#include "platform/SharedBuffer.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/image-decoders/ImageDecoder.h"
 #include "platform/wtf/Allocator.h"
 #include "platform/wtf/Forward.h"
+#include "platform/wtf/RefPtr.h"
 #include "platform/wtf/Vector.h"
 #include "third_party/skia/include/core/SkRWBuffer.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
 
 class SkImage;
 
 namespace blink {
 
 class ImageFrameGenerator;
 class SharedBuffer;
@@ skipping 39 matching lines @@
   explicit DeferredImageDecoder(std::unique_ptr<ImageDecoder> actual_decoder);
 
   friend class DeferredImageDecoderTest;
   ImageFrameGenerator* FrameGenerator() { return frame_generator_.Get(); }
 
   void ActivateLazyDecoding();
   void PrepareLazyDecodedFrames();
 
   sk_sp<SkImage> CreateFrameImageAtIndex(size_t index, bool known_to_be_opaque);
 
-  void SetDataInternal(RefPtr<SharedBuffer> data,
+  void SetDataInternal(PassRefPtr<SharedBuffer> data,
                        bool all_data_received,
                        bool push_data_to_decoder);
 
   // Copy of the data that is passed in, used by deferred decoding.
   // Allows creating readonly snapshots that may be read in another thread.
-  std::unique_ptr<SkRWBuffer> rw_buffer_;
+  RefPtr<SharedBuffer> buffer_;
   std::unique_ptr<ImageDecoder> actual_decoder_;
 
   String filename_extension_;
   IntSize size_;
   int repetition_count_;
   bool has_embedded_color_space_ = false;
   bool all_data_received_;
   bool can_yuv_decode_;
   bool has_hot_spot_;
   sk_sp<SkColorSpace> color_space_for_sk_images_;
   IntPoint hot_spot_;
 
   // Caches frame state information.
   Vector<DeferredFrameData> frame_data_;
   RefPtr<ImageFrameGenerator> frame_generator_;
 };
 
 }  // namespace blink
 
 #endif