[Cast] Aggressively send sender reports until first receiver report is received.

media/cast/rtcp/rtcp.h

 // Copyright 2013 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.
 
 #ifndef MEDIA_CAST_RTCP_RTCP_H_
 #define MEDIA_CAST_RTCP_RTCP_H_
 
 #include <list>
 #include <map>
 #include <queue>
@@ skipping 80 matching lines @@
   // will append the log messages.
   void SendRtcpFromRtpReceiver(
       const RtcpCastMessage* cast_message,
       const ReceiverRtcpEventSubscriber::RtcpEventMultiMap* rtcp_events);
 
   void IncomingRtcpPacket(const uint8* rtcp_buffer, size_t length);
   bool Rtt(base::TimeDelta* rtt,
            base::TimeDelta* avg_rtt,
            base::TimeDelta* min_rtt,
            base::TimeDelta* max_rtt) const;
+  bool is_rtt_available() const { return number_of_rtt_in_avg_ > 0; }
   bool RtpTimestampInSenderTime(int frequency,
                                 uint32 rtp_timestamp,
                                 base::TimeTicks* rtp_timestamp_in_ticks) const;
 
   // Set the history size to record Cast receiver events. The event history is
   // used to remove duplicates. The history will store at most |size| events.
   void SetCastReceiverEventHistorySize(size_t size);
 
   // Update the target delay. Will be added to every sender report.
   void SetTargetDelay(base::TimeDelta target_delay);
@@ skipping 67 matching lines @@
   uint16 target_delay_ms_;
   bool is_audio_;
 
   DISALLOW_COPY_AND_ASSIGN(Rtcp);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_RTCP_RTCP_H_