Split libjingle's signaling thread from the UI thread

content/renderer/media/remote_media_stream_impl.h

Index: content/renderer/media/remote_media_stream_impl.h
diff --git a/content/renderer/media/remote_media_stream_impl.h b/content/renderer/media/remote_media_stream_impl.h
index bcecd62d6e913676cf69f5c598aea796a8e596f7..256479368b61d3f800fce89a4e6e50bd12aea12f 100644
--- a/content/renderer/media/remote_media_stream_impl.h
+++ b/content/renderer/media/remote_media_stream_impl.h
@@ -8,8 +8,8 @@
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
-#include "base/memory/scoped_vector.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/single_thread_task_runner.h"
 #include "content/common/content_export.h"
 #include "third_party/libjingle/source/talk/app/webrtc/mediastreaminterface.h"
 #include "third_party/WebKit/public/platform/WebMediaStream.h"
@@ -18,29 +18,47 @@
 
 namespace content {
 
-class RemoteMediaStreamTrackAdapter;
+class RemoteAudioTrackAdapter;
+class RemoteVideoTrackAdapter;
 
 // RemoteMediaStreamImpl serves as a container and glue between remote webrtc
 // MediaStreams and WebKit MediaStreams. For each remote MediaStream received
 // on a PeerConnection a RemoteMediaStreamImpl instance is created and
 // owned by RtcPeerConnection.
 class CONTENT_EXPORT RemoteMediaStreamImpl
-    : NON_EXPORTED_BASE(public webrtc::ObserverInterface),
-      NON_EXPORTED_BASE(public base::NonThreadSafe) {
+    : NON_EXPORTED_BASE(public webrtc::ObserverInterface) {
  public:
-  explicit RemoteMediaStreamImpl(
+  RemoteMediaStreamImpl(
+      const scoped_refptr<base::SingleThreadTaskRunner>& main_thread,
       webrtc::MediaStreamInterface* webrtc_stream);
   ~RemoteMediaStreamImpl() override;
 
   const blink::WebMediaStream& webkit_stream() { return webkit_stream_; }
+  const scoped_refptr<webrtc::MediaStreamInterface>& webrtc_stream() {
+    return webrtc_stream_;
+  }
 
  private:
+  typedef std::vector<scoped_refptr<RemoteAudioTrackAdapter>>
+      RemoteAudioTrackAdapters;
+  typedef std::vector<scoped_refptr<RemoteVideoTrackAdapter>>
+      RemoteVideoTrackAdapters;
+
+  void InitializeOnMainThread(const std::string& label);
+
   // webrtc::ObserverInterface implementation.
   void OnChanged() override;
 
-  scoped_refptr<webrtc::MediaStreamInterface> webrtc_stream_;
-  ScopedVector<RemoteMediaStreamTrackAdapter> video_track_observers_;
-  ScopedVector<RemoteMediaStreamTrackAdapter> audio_track_observers_;
+  void OnChangedOnMainThread(
+      scoped_ptr<RemoteAudioTrackAdapters> audio_tracks,
+      scoped_ptr<RemoteVideoTrackAdapters> video_tracks);
+
+  const scoped_refptr<base::SingleThreadTaskRunner> main_thread_;
+  const scoped_refptr<base::SingleThreadTaskRunner> signaling_thread_;
+  const scoped_refptr<webrtc::MediaStreamInterface> webrtc_stream_;
+
+  RemoteVideoTrackAdapters video_track_observers_;
+  RemoteAudioTrackAdapters audio_track_observers_;
   blink::WebMediaStream webkit_stream_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteMediaStreamImpl);