[Mojo Video Capture] Add test coverage for accelerated jpeg decoding

media/capture/video/video_frame_receiver.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_CAPTURE_VIDEO_VIDEO_FRAME_RECEIVER_H_
 #define MEDIA_CAPTURE_VIDEO_VIDEO_FRAME_RECEIVER_H_
 
 #include "media/capture/capture_export.h"
 #include "media/capture/mojo/video_capture_types.mojom.h"
 #include "media/capture/video/video_capture_buffer_handle.h"
@@ skipping 35 matching lines @@
   // OnFrameReadInBuffer() for the same buffer. In that case, it means that the
   // caller is asking the VideoFrameReceiver to release the read permission and
   // buffer handle at its earliest convenience.
   // After this call, a producer may immediately reuse the retired |buffer_id|
   // with a new buffer via a call to OnNewBufferHandle().
   virtual void OnBufferRetired(int buffer_id) = 0;
 
   virtual void OnError() = 0;
   virtual void OnLog(const std::string& message) = 0;
   virtual void OnStarted() = 0;
+  virtual void OnStartedUsingGpuDecode(){};

[mcasas, 2017/03/08 01:33:17]

s/(){}/() {}/
however, same comments as above, why not make it 
pure virtual? We should only have one meaningful 
implementation and it won't hurt to MOCK and potentially
catch spurious calls in tests.

[chfremer, 2017/03/08 18:58:08]

Done.

 };
 
 }  // namespace media
 
 #endif  // MEDIA_CAPTURE_VIDEO_VIDEO_FRAME_RECEIVER_H_