Add accessor functions for protected member variables of ModuleRtpRtcpImpl.

webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h

Index: webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
index 10639bbca38b57956802a039b6e862bf678d7c27..f286b5e6eee78c5c9866143207adfc61b2ba8600 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
+++ b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
@@ -312,12 +312,25 @@ class ModuleRtpRtcpImpl : public RtpRtcp, public RTCPReceiver::ModuleRtpRtcp {
  protected:
   bool UpdateRTCPReceiveInformationTimers();
 
+  RTPSender* rtp_sender() { return &rtp_sender_; }
+  const RTPSender* rtp_sender() const { return &rtp_sender_; }
+
+  RTCPSender* rtcp_sender() { return &rtcp_sender_; }
+  const RTCPSender* rtcp_sender() const { return &rtcp_sender_; }
+
+  RTCPReceiver* rtcp_receiver() { return &rtcp_receiver_; }
+  const RTCPReceiver* rtcp_receiver() const { return &rtcp_receiver_; }
+
+  const Clock* clock() const { return clock_; }
+
+  // TODO(nisse): Demote all member variables to private, as soon as
+  // downstream code is updated to use the above accessor methods.
   RTPSender rtp_sender_;
 
   RTCPSender rtcp_sender_;
   RTCPReceiver rtcp_receiver_;
 
-  Clock* clock_;
+  const Clock* const clock_;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(RtpRtcpImplTest, Rtt);