Reland "Update mojo Decryptor interface to support reusing shared memory"

media/mojo/common/mojo_shared_buffer_video_frame.h

 // 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 MEDIA_MOJO_COMMON_MOJO_SHARED_BUFFER_VIDEO_FRAME_H_
 #define MEDIA_MOJO_COMMON_MOJO_SHARED_BUFFER_VIDEO_FRAME_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 64 matching lines @@
   // Sets the callback to be called to free the shared buffer. If not null,
   // it is called on destruction, and is passed ownership of |handle|.
   void SetMojoSharedBufferDoneCB(
       const MojoSharedBufferDoneCB& mojo_shared_buffer_done_cb);
 
  private:
   // mojo::TypeConverter added as a friend so that MojoSharedBufferVideoFrame
   // can be transferred across a mojo connection.
   friend struct mojo::TypeConverter<mojo::StructPtr<interfaces::VideoFrame>,
                                     scoped_refptr<VideoFrame>>;
+  friend class MojoDecryptorService;
 
   MojoSharedBufferVideoFrame(VideoPixelFormat format,
                              const gfx::Size& coded_size,
                              const gfx::Rect& visible_rect,
                              const gfx::Size& natural_size,
                              mojo::ScopedSharedBufferHandle handle,
                              size_t mapped_size,
                              base::TimeDelta timestamp);
   ~MojoSharedBufferVideoFrame() override;
 
@@ skipping 19 matching lines @@
   uint8_t* shared_buffer_data_;
   size_t offsets_[kMaxPlanes];
   MojoSharedBufferDoneCB mojo_shared_buffer_done_cb_;
 
   DISALLOW_COPY_AND_ASSIGN(MojoSharedBufferVideoFrame);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_MOJO_COMMON_MOJO_SHARED_BUFFER_VIDEO_FRAME_H_