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

media/capture/video/video_frame_receiver.h

Index: media/capture/video/video_frame_receiver.h
diff --git a/media/capture/video/video_frame_receiver.h b/media/capture/video/video_frame_receiver.h
index 9faaf476b8b1df5982df636605af440872d0a249..964245ac4ca7fafd54d23726f85f9f264a60e234 100644
--- a/media/capture/video/video_frame_receiver.h
+++ b/media/capture/video/video_frame_receiver.h
@@ -53,6 +53,7 @@ class CAPTURE_EXPORT VideoFrameReceiver {
   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