Add send frame rate statistics callback

BUG=2235
R=mflodman@webrtc.org, pbos@webrtc.org, stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/4479005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5213 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h

@@ -363,6 +363,10 @@ class ModuleRtpRtcpImpl : public RtpRtcp {
 
   void OnRequestSendReport();
 
+  virtual void RegisterSendFrameCountObserver(
+      FrameCountObserver* observer) OVERRIDE;
+  virtual FrameCountObserver* GetSendFrameCountObserver() const OVERRIDE;
+
  protected:
   void RegisterChildModule(RtpRtcp* module);