Introduce struct MediaConfig, with construction-time settings.

talk/app/webrtc/mediacontroller.cc

Index: talk/app/webrtc/mediacontroller.cc
diff --git a/talk/app/webrtc/mediacontroller.cc b/talk/app/webrtc/mediacontroller.cc
index 24f5877483b0752c9e8e5e85566981701a948232..16b32ae9a34053e398ef9abe39e5be3e38e95bbd 100644
--- a/talk/app/webrtc/mediacontroller.cc
+++ b/talk/app/webrtc/mediacontroller.cc
@@ -42,8 +42,11 @@ class MediaController : public webrtc::MediaControllerInterface,
                         public sigslot::has_slots<> {
  public:
   MediaController(rtc::Thread* worker_thread,
+                  const webrtc::MediaConfig& config,
                   cricket::ChannelManager* channel_manager)
-      : worker_thread_(worker_thread), channel_manager_(channel_manager) {
+    : worker_thread_(worker_thread),
+      config_(config),
+      channel_manager_(channel_manager) {
     RTC_DCHECK(nullptr != worker_thread);
     worker_thread_->Invoke<void>(
         rtc::Bind(&MediaController::Construct_w, this,
@@ -61,6 +64,9 @@ class MediaController : public webrtc::MediaControllerInterface,
   cricket::ChannelManager* channel_manager() const override {
     return channel_manager_;
   }
+  const webrtc::MediaConfig* config() const override {
+    return &config_;
+  }
 
  private:
   void Construct_w(cricket::MediaEngineInterface* media_engine) {
@@ -79,6 +85,7 @@ class MediaController : public webrtc::MediaControllerInterface,
   }
 
   rtc::Thread* const worker_thread_;
+  const webrtc::MediaConfig config_;
   cricket::ChannelManager* const channel_manager_;
   rtc::scoped_ptr<webrtc::Call> call_;
 
@@ -90,7 +97,8 @@ namespace webrtc {
 
 MediaControllerInterface* MediaControllerInterface::Create(
     rtc::Thread* worker_thread,
+    const MediaConfig& config,
     cricket::ChannelManager* channel_manager) {
-  return new MediaController(worker_thread, channel_manager);
+  return new MediaController(worker_thread, config, channel_manager);
 }
 }  // namespace webrtc