Fix for scenario where m-line is revived after being set to port 0.

talk/app/webrtc/rtpreceiverinterface.h

Index: talk/app/webrtc/rtpreceiverinterface.h
diff --git a/talk/app/webrtc/rtpreceiverinterface.h b/talk/app/webrtc/rtpreceiverinterface.h
index 099699efc4be7a6d729558144131a4163eeed865..6a671a7b465fbf3faa4f65987667d79b77a420b9 100644
--- a/talk/app/webrtc/rtpreceiverinterface.h
+++ b/talk/app/webrtc/rtpreceiverinterface.h
@@ -35,6 +35,7 @@
 
 #include "talk/app/webrtc/proxy.h"
 #include "talk/app/webrtc/mediastreaminterface.h"
+#include "talk/session/media/mediasession.h"
 #include "webrtc/base/refcount.h"
 #include "webrtc/base/scoped_ref_ptr.h"
 
@@ -44,12 +45,17 @@ class RtpReceiverInterface : public rtc::RefCountInterface {
  public:
   virtual rtc::scoped_refptr<MediaStreamTrackInterface> track() const = 0;
 
+  // Audio or video?
+  virtual cricket::MediaType media_type() const = 0;
+
   // Not to be confused with "mid", this is a field we can temporarily use
   // to uniquely identify a receiver until we implement Unified Plan SDP.
   virtual std::string id() const = 0;
 
   virtual void Stop() = 0;
 
+  virtual void Reconfigure() = 0;

[pthatcher1, 2015/11/11 00:45:02]

Can you add a comment describing what effect this has and when it is appropriate
to call it?

[Taylor Brandstetter, 2015/11/11 01:33:30]

Done. Just to note, I'm planning to move this method off of the "interface"
classes in a future CL, like we've discussed.

+
  protected:
   virtual ~RtpReceiverInterface() {}
 };
@@ -57,8 +63,10 @@ class RtpReceiverInterface : public rtc::RefCountInterface {
 // Define proxy for RtpReceiverInterface.
 BEGIN_PROXY_MAP(RtpReceiver)
 PROXY_CONSTMETHOD0(rtc::scoped_refptr<MediaStreamTrackInterface>, track)
+PROXY_CONSTMETHOD0(cricket::MediaType, media_type)
 PROXY_CONSTMETHOD0(std::string, id)
 PROXY_METHOD0(void, Stop)
+PROXY_METHOD0(void, Reconfigure)
 END_PROXY()
 
 }  // namespace webrtc