Add support for multiple report blocks.

Use a weighted average of fraction loss for bandwidth estimation.

TEST=trybots and vie_auto_test --automated
BUG=1811
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2198004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4762 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h

@@ -377,6 +377,7 @@ class ModuleRtpRtcpImpl : public RtpRtcp {
 
  private:
   int64_t RtcpReportInterval();
+  void SetRtcpReceiverSsrcs(uint32_t main_ssrc);
 
   int32_t             id_;
   const bool                audio_;