Wire up CallStats to provide modules with correct RTT.

BUG=769
TEST=Manual test since there is no ViE APi to get RTT for receive channels.

Review URL: https://webrtc-codereview.appspot.com/937027

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3163 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h

@@ -225,6 +225,8 @@ class ModuleRtpRtcpImpl : public RtpRtcp {
     // Reset RoundTripTime statistics
     virtual WebRtc_Word32 ResetRTT(const WebRtc_UWord32 remoteSSRC);
 
+    virtual void SetRtt(uint32_t rtt);
+
     // Force a send of an RTCP packet
     // normal SR and RR are triggered via the process function
     virtual WebRtc_Word32 SendRTCP(WebRtc_UWord32 rtcpPacketType = kRtcpReport);
@@ -509,6 +511,8 @@ private:
 
     RemoteBitrateEstimator* remote_bitrate_;
 
+    RtcpRttObserver* rtt_observer_;
+
 #ifdef MATLAB
     MatlabPlot*           _plot1;
 #endif