Propagate estimated RTT from receivers to rtt observer.

BUG=1613
R=stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/3119004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5063 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/modules/rtp_rtcp/mocks/mock_rtp_rtcp.h b/modules/rtp_rtcp/mocks/mock_rtp_rtcp.h
index 608fe35..355d796 100644
--- a/modules/rtp_rtcp/mocks/mock_rtp_rtcp.h
+++ b/modules/rtp_rtcp/mocks/mock_rtp_rtcp.h
@@ -168,6 +168,8 @@
       int32_t(const uint8_t subType, const uint32_t name, const uint8_t* data, const uint16_t length));
   MOCK_METHOD1(SetRTCPVoIPMetrics,
       int32_t(const RTCPVoIPMetric* VoIPMetric));
+  MOCK_METHOD1(SetRtcpXrRrtrStatus,
+      void(bool enable));
   MOCK_CONST_METHOD0(REMB,
       bool());
   MOCK_METHOD1(SetREMBStatus,