Chromoting to report roundtrip latency

remoting/client/chromoting_stats.h

Index: remoting/client/chromoting_stats.h
diff --git a/remoting/client/chromoting_stats.h b/remoting/client/chromoting_stats.h
index 174279b49d36343c68f7e29b8337d41583d571d8..9e91457216f45f0539029949051f69d0bcb7d0e3 100644
--- a/remoting/client/chromoting_stats.h
+++ b/remoting/client/chromoting_stats.h
@@ -23,6 +23,7 @@ class ChromotingStats {
   RunningAverage* video_encode_ms() { return &video_encode_ms_; }
   RunningAverage* video_decode_ms() { return &video_decode_ms_; }
   RunningAverage* video_paint_ms() { return &video_paint_ms_; }
+  RunningAverage* round_trip_ms() { return &round_trip_ms_; }
 
  private:
   RateCounter video_bandwidth_;
@@ -30,6 +31,7 @@ class ChromotingStats {
   RunningAverage video_encode_ms_;
   RunningAverage video_decode_ms_;
   RunningAverage video_paint_ms_;
+  RunningAverage round_trip_ms_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromotingStats);
 };