[Chromoting] Send DesktopFrame::capturer_id() to client through WebrtcVideoStream

remoting/protocol/webrtc_video_stream.cc

Index: remoting/protocol/webrtc_video_stream.cc
diff --git a/remoting/protocol/webrtc_video_stream.cc b/remoting/protocol/webrtc_video_stream.cc
index 8c2478bf7b1fd0ce525d646143071d111bd8f423..60b2f01c7d8d2a90528b45b492355e04120bf6f1 100644
--- a/remoting/protocol/webrtc_video_stream.cc
+++ b/remoting/protocol/webrtc_video_stream.cc
@@ -41,6 +41,7 @@ struct WebrtcVideoStream::FrameTimestamps {
 struct WebrtcVideoStream::EncodedFrameWithTimestamps {
   std::unique_ptr<WebrtcVideoEncoder::EncodedFrame> frame;
   std::unique_ptr<FrameTimestamps> timestamps;
+  uint32_t capturer_id;

[Sergey Ulanov, 2017/03/24 23:54:26]

I think it's better to put this in WebrtcVideoStream::FrameTimestamps.
And then rename FrameTimestamps -> FrameStats and 
EncodedFrameWithTimestamps -> EncodedFrameWithStats.

Also please initialize this field.

[Hzj_jie, 2017/03/25 02:15:49]

I intended to do so, but it's a little bit complex comparing to this small
change.
No matter, I will do it if you suggest so.

 };
 
 WebrtcVideoStream::WebrtcVideoStream()
@@ -203,6 +204,7 @@ WebrtcVideoStream::EncodedFrameWithTimestamps WebrtcVideoStream::EncodeFrame(
   result.timestamps->encode_started_time = base::TimeTicks::Now();
   result.frame = encoder->Encode(frame.get(), params);
   result.timestamps->encode_ended_time = base::TimeTicks::Now();
+  result.capturer_id = frame->capturer_id();
   return result;
 }
 
@@ -250,6 +252,8 @@ void WebrtcVideoStream::OnFrameEncoded(EncodedFrameWithTimestamps frame) {
     stats.encode_delay = frame.timestamps->encode_ended_time -
                          frame.timestamps->encode_started_time;
 
+    stats.capturer_id = frame.capturer_id;
+
     video_stats_dispatcher_.OnVideoFrameStats(result.frame_id, stats);
   }
 }