Introduce struct MediaConfig, with construction-time settings.

talk/app/webrtc/mediacontroller.h

 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 14 matching lines @@
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef TALK_APP_WEBRTC_MEDIACONTROLLER_H_
 #define TALK_APP_WEBRTC_MEDIACONTROLLER_H_
 
 #include "webrtc/base/thread.h"
 
 namespace cricket {
 class ChannelManager;
+struct MediaConfig;
 }  // namespace cricket
 
 namespace webrtc {
 class Call;
 class VoiceEngine;
 
 // The MediaController currently owns shared state between media channels, but
 // in the future will create and own RtpSenders and RtpReceivers.
 class MediaControllerInterface {
  public:
   static MediaControllerInterface* Create(
+      const cricket::MediaConfig& config,
       rtc::Thread* worker_thread,
       cricket::ChannelManager* channel_manager);
 
   virtual ~MediaControllerInterface() {}
   virtual webrtc::Call* call_w() = 0;
   virtual cricket::ChannelManager* channel_manager() const = 0;
+  virtual const cricket::MediaConfig& config() const = 0;
 };
 }  // namespace webrtc
 
 #endif  // TALK_APP_WEBRTC_MEDIACONTROLLER_H_