[Cast] RTT clean-up to the max!

media/cast/sender/frame_sender.h

Index: media/cast/sender/frame_sender.h
diff --git a/media/cast/sender/frame_sender.h b/media/cast/sender/frame_sender.h
index 6cf02f563be0925a380b2ec6ae1627261695b290..4e38be0b210e44ecbd5479b41edb37d61adc9ae1 100644
--- a/media/cast/sender/frame_sender.h
+++ b/media/cast/sender/frame_sender.h
@@ -43,12 +43,15 @@ class FrameSender {
   void ScheduleNextRtcpReport();
   void SendRtcpReport(bool schedule_future_reports);
 
-  void OnReceivedRtt(base::TimeDelta rtt,
-                     base::TimeDelta avg_rtt,
-                     base::TimeDelta min_rtt,
-                     base::TimeDelta max_rtt);
+  void OnMeasuredRoundTripTime(base::TimeDelta rtt);
 
-  bool is_rtt_available() const { return rtt_available_; }
+  bool is_rtt_available() const {
+    return current_round_trip_time_ > base::TimeDelta();
+  }
+
+  base::TimeDelta current_round_trip_time() const {
+    return current_round_trip_time_;
+  }
 
   const scoped_refptr<CastEnvironment> cast_environment_;
 
@@ -61,12 +64,6 @@ class FrameSender {
 
   const uint32 ssrc_;
 
-  // RTT information from RTCP.
-  bool rtt_available_;
-  base::TimeDelta rtt_;
-  base::TimeDelta avg_rtt_;
-  base::TimeDelta min_rtt_;
-  base::TimeDelta max_rtt_;
 
  protected:
   // Schedule and execute periodic checks for re-sending packets.  If no
@@ -147,6 +144,9 @@ class FrameSender {
   base::TimeTicks frame_reference_times_[256];
   RtpTimestamp frame_rtp_timestamps_[256];
 
+  // The most recently measured round trip time.
+  base::TimeDelta current_round_trip_time_;
+
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<FrameSender> weak_factory_;