VideoCaptureParams: add flag for hinting capture using GpuMemoryBuffers & flag for it

chrome/renderer/media/cast_receiver_session.h

 // Copyright 2015 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 CHROME_RENDERER_MEDIA_CAST_RECEIVER_SESSION_H_
 #define CHROME_RENDERER_MEDIA_CAST_RECEIVER_SESSION_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/single_thread_task_runner.h"
 #include "chrome/renderer/media/cast_receiver_session_delegate.h"
 
 namespace blink {
 class WebMediaStream;
 }
 
 namespace media {
 class AudioCapturerSource;
-class VideoCaptureFormat;
+struct VideoCaptureFormat;
 class VideoCapturerSource;
 }
 
 namespace net {
 class IPEndPoint;
 }
 
 namespace base {
 class DictionaryValue;
 }
@@ skipping 38 matching lines @@
   media::cast::FrameReceiverConfig audio_config_;
   media::cast::FrameReceiverConfig video_config_;
   scoped_ptr<CastReceiverSessionDelegate> delegate_;
   const scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
   media::VideoCaptureFormat format_;
 
   DISALLOW_COPY_AND_ASSIGN(CastReceiverSession);
 };
 
 #endif // CHROME_RENDERER_MEDIA_CAST_RECEIVER_SESSION_H_