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

remoting/protocol/frame_stats.cc

 // 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.
 
 #include "remoting/protocol/frame_stats.h"
 
 #include "remoting/proto/video.pb.h"
 #include "remoting/proto/video_stats.pb.h"
 
 namespace remoting {
@@ skipping 115 matching lines @@
   }
   if (send_pending_delay != base::TimeDelta::Max()) {
     message_out->set_send_pending_time_ms(send_pending_delay.InMilliseconds());
   }
   if (rtt_estimate != base::TimeDelta::Max()) {
     message_out->set_rtt_estimate_ms(rtt_estimate.InMilliseconds());
   }
   if (bandwidth_estimate_kbps >= 0) {
     message_out->set_bandwidth_estimate_kbps(bandwidth_estimate_kbps);
   }
+  if (capturer_id != webrtc::DesktopCapturerId::kUnknown) {
+    message_out->set_capturer_id(capturer_id);
+  }
 }
 
 FrameStats::FrameStats() = default;
 FrameStats::FrameStats(const FrameStats&) = default;
 FrameStats::~FrameStats() = default;
 
 }  // namespace protocol
 }  // namespace remoting