Adding getParameters/setParameters APIs to RtpReceiver.

webrtc/api/rtpreceiver.h

Index: webrtc/api/rtpreceiver.h
diff --git a/webrtc/api/rtpreceiver.h b/webrtc/api/rtpreceiver.h
index b5818573da12602482475003f156526dec4dfc8e..2e7339d4da448c60888fc0cba6f0bbfc1affd752 100644
--- a/webrtc/api/rtpreceiver.h
+++ b/webrtc/api/rtpreceiver.h
@@ -56,6 +56,9 @@ class AudioRtpReceiver : public ObserverInterface,
 
   void Stop() override;
 
+  RtpParameters GetParameters() const override;
+  bool SetParameters(const RtpParameters& parameters) override;
+
  private:
   void Reconfigure();
 
@@ -89,6 +92,9 @@ class VideoRtpReceiver : public rtc::RefCountedObject<RtpReceiverInterface> {
 
   void Stop() override;
 
+  RtpParameters GetParameters() const override;
+  bool SetParameters(const RtpParameters& parameters) override;
+
  private:
   std::string id_;
   uint32_t ssrc_;