MediaStream audio: Refactor 3 separate "glue" implementations into one.

content/renderer/media/webrtc/webrtc_media_stream_adapter.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_MEDIA_STREAM_ADAPTER_H_
 #define CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_MEDIA_STREAM_ADAPTER_H_
 
+#include <memory>
+#include <vector>
+
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/memory/scoped_vector.h"
 #include "content/common/content_export.h"
 #include "content/renderer/media/media_stream.h"
 #include "third_party/WebKit/public/platform/WebMediaStream.h"
 #include "third_party/webrtc/api/mediastreaminterface.h"
 
 namespace content {
 
 class PeerConnectionDependencyFactory;
 class MediaStreamVideoWebRtcSink;
+class WebRtcAudioSink;
 
 // WebRtcMediaStreamAdapter is an adapter between a blink::WebMediaStream
 // object and a webrtc MediaStreams that is currently sent on a PeerConnection.
 // The responsibility of the class is to create and own a representation of a
 // webrtc MediaStream that can be added and removed from a RTCPeerConnection.
 // An instance of WebRtcMediaStreamAdapter is created when a MediaStream is
 // added to an RTCPeerConnection object
 // Instances of this class is owned by the RTCPeerConnectionHandler object that
 // created it.
 class CONTENT_EXPORT WebRtcMediaStreamAdapter
     : NON_EXPORTED_BASE(public MediaStreamObserver) {
  public:
   WebRtcMediaStreamAdapter(const blink::WebMediaStream& web_stream,
                            PeerConnectionDependencyFactory* factory);
   ~WebRtcMediaStreamAdapter() override;
 
-  bool IsEqual(const blink::WebMediaStream& web_stream) {
+  bool IsEqual(const blink::WebMediaStream& web_stream) const {
     return web_stream_.getExtraData() == web_stream.getExtraData();
   }
 
-  webrtc::MediaStreamInterface* webrtc_media_stream() {
+  webrtc::MediaStreamInterface* webrtc_media_stream() const {
     return webrtc_media_stream_.get();
   }
 
  protected:
   // MediaStreamObserver implementation.
   void TrackAdded(const blink::WebMediaStreamTrack& track) override;
   void TrackRemoved(const blink::WebMediaStreamTrack& track) override;
 
  private:
-  void CreateAudioTrack(const blink::WebMediaStreamTrack& track);
-  void CreateVideoTrack(const blink::WebMediaStreamTrack& track);
+  void AddAudioSinkToTrack(const blink::WebMediaStreamTrack& track);
+  void AddVideoSinkToTrack(const blink::WebMediaStreamTrack& track);
 
   const blink::WebMediaStream web_stream_;
 
   // Pointer to a PeerConnectionDependencyFactory, owned by the RenderThread.
   // It's valid for the lifetime of RenderThread.
   PeerConnectionDependencyFactory* const factory_;
 
   scoped_refptr<webrtc::MediaStreamInterface> webrtc_media_stream_;
-  ScopedVector<MediaStreamVideoWebRtcSink> video_adapters_;
+  std::vector<std::unique_ptr<WebRtcAudioSink>> audio_sinks_;
+  std::vector<std::unique_ptr<MediaStreamVideoWebRtcSink>> video_sinks_;
 
   DISALLOW_COPY_AND_ASSIGN (WebRtcMediaStreamAdapter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_MEDIA_STREAM_ADAPTER_H_