Adding getParameters/setParameters APIs to RtpReceiver.

webrtc/api/rtpsender.h

Index: webrtc/api/rtpsender.h
diff --git a/webrtc/api/rtpsender.h b/webrtc/api/rtpsender.h
index fe61cbde760a4dc3f87d3181046510d70255abb3..86de7658c9818b5852fc6423938fde5a731fc9cd 100644
--- a/webrtc/api/rtpsender.h
+++ b/webrtc/api/rtpsender.h
@@ -98,8 +98,8 @@ class AudioRtpSender : public ObserverInterface,
 
   void Stop() override;
 
-  RtpParameters GetParameters() const;
-  bool SetParameters(const RtpParameters& parameters);
+  RtpParameters GetParameters() const override;
+  bool SetParameters(const RtpParameters& parameters) override;
 
  private:
   // TODO(nisse): Since SSRC == 0 is technically valid, figure out
@@ -164,8 +164,8 @@ class VideoRtpSender : public ObserverInterface,
 
   void Stop() override;
 
-  RtpParameters GetParameters() const;
-  bool SetParameters(const RtpParameters& parameters);
+  RtpParameters GetParameters() const override;
+  bool SetParameters(const RtpParameters& parameters) override;
 
  private:
   bool can_send_track() const { return track_ && ssrc_; }