Enable setting the maximum bitrate limit in RtpSender.

webrtc/api/webrtcsession.h

Index: webrtc/api/webrtcsession.h
diff --git a/webrtc/api/webrtcsession.h b/webrtc/api/webrtcsession.h
index 70265d30434e012369a508bf0e847553bb17dd07..4ccf9259f73a3bbb91cd17eac0452f432bdf40ca 100644
--- a/webrtc/api/webrtcsession.h
+++ b/webrtc/api/webrtcsession.h
@@ -239,6 +239,10 @@ class WebRtcSession : public AudioProviderInterface,
   void SetRawAudioSink(uint32_t ssrc,
                        rtc::scoped_ptr<AudioSinkInterface> sink) override;
 
+  RTCRtpParameters GetAudioRtpParameters(uint32_t ssrc) override;
+  bool SetAudioRtpParameters(uint32_t ssrc,
+                             const RTCRtpParameters& parameters) override;
+
   // Implements VideoMediaProviderInterface.
   bool SetCaptureDevice(uint32_t ssrc, cricket::VideoCapturer* camera) override;
   void SetVideoPlayout(
@@ -249,6 +253,10 @@ class WebRtcSession : public AudioProviderInterface,
                     bool enable,
                     const cricket::VideoOptions* options) override;
 
+  RTCRtpParameters GetVideoRtpParameters(uint32_t ssrc) override;
+  bool SetVideoRtpParameters(uint32_t ssrc,
+                             const RTCRtpParameters& parameters) override;
+
   // Implements DtmfProviderInterface.
   virtual bool CanInsertDtmf(const std::string& track_id);
   virtual bool InsertDtmf(const std::string& track_id,