Move responsibility for RTP header extensions on video receive.

webrtc/pc/mediacontroller.h

Index: webrtc/pc/mediacontroller.h
diff --git a/webrtc/pc/mediacontroller.h b/webrtc/pc/mediacontroller.h
index f5a9034918b1df58ab55115a11d91d10168da5b1..f279192862f9475c235021201ef2cd507f1b266b 100644
--- a/webrtc/pc/mediacontroller.h
+++ b/webrtc/pc/mediacontroller.h
@@ -12,6 +12,7 @@
 #define WEBRTC_PC_MEDIACONTROLLER_H_
 
 #include "webrtc/base/thread.h"
+#include "webrtc/config.h"
 
 namespace cricket {
 class ChannelManager;
@@ -40,6 +41,10 @@ class MediaControllerInterface {
   virtual webrtc::Call* call_w() = 0;
   virtual cricket::ChannelManager* channel_manager() const = 0;
   virtual const cricket::MediaConfig& config() const = 0;
+  // Proxy for Call (extensions may change mid-call).
+  // TODO(nisse): Should belong to RtpTransportController.
+  virtual void SetVideoReceiveRtpHeaderExtensions(
+      const std::vector<RtpExtension>& extensions) = 0;

[pthatcher1, 2017/04/29 00:25:18]

This shouldn't be at the per-MediaController level.  There will be many
RtpTransports per MediaCotnroller, and each one needs to support independent
extensions.

 };
 }  // namespace webrtc