start/stop the source of the capturer when 1st audiotrack/last audiotrack is added/removed

content/renderer/media/mock_media_stream_dependency_factory.h

 // Copyright (c) 2012 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_MOCK_MEDIA_STREAM_DEPENDENCY_FACTORY_H_
 #define CONTENT_RENDERER_MEDIA_MOCK_MEDIA_STREAM_DEPENDENCY_FACTORY_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 88 matching lines @@
   virtual ~MockLocalVideoTrack();
 
  private:
   bool enabled_;
   std::string id_;
   TrackState state_;
   scoped_refptr<webrtc::VideoSourceInterface> source_;
   webrtc::ObserverInterface* observer_;
 };
 
-class MockLocalAudioTrack : public webrtc::AudioTrackInterface {
- public:
-  explicit MockLocalAudioTrack(const std::string& id)
-    : enabled_(false),
-      id_(id),
-      state_(MediaStreamTrackInterface::kLive),
-      observer_(NULL) {
-  }
-  virtual std::string kind() const OVERRIDE;
-  virtual std::string id() const OVERRIDE;
-  virtual bool enabled() const OVERRIDE;
-  virtual TrackState state() const OVERRIDE;
-  virtual bool set_enabled(bool enable) OVERRIDE;
-  virtual bool set_state(TrackState new_state) OVERRIDE;
-  virtual void RegisterObserver(webrtc::ObserverInterface* observer) OVERRIDE;
-  virtual void UnregisterObserver(webrtc::ObserverInterface* observer) OVERRIDE;
-  virtual webrtc::AudioSourceInterface* GetSource() const OVERRIDE;
-
- protected:
-  virtual ~MockLocalAudioTrack() {}
-
- private:
-  bool enabled_;
-  std::string id_;
-  TrackState state_;
-  webrtc::ObserverInterface* observer_;
-};
-
 // A mock factory for creating different objects for
 // RTC MediaStreams and PeerConnections.
 class MockMediaStreamDependencyFactory : public MediaStreamDependencyFactory {
  public:
   MockMediaStreamDependencyFactory();
   virtual ~MockMediaStreamDependencyFactory();
 
   virtual scoped_refptr<webrtc::PeerConnectionInterface> CreatePeerConnection(
       const webrtc::PeerConnectionInterface::IceServers& ice_servers,
       const webrtc::MediaConstraintsInterface* constraints,
@@ skipping 41 matching lines @@
   bool mock_pc_factory_created_;
   scoped_refptr <MockAudioSource> last_audio_source_;
   scoped_refptr <MockVideoSource> last_video_source_;
 
   DISALLOW_COPY_AND_ASSIGN(MockMediaStreamDependencyFactory);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MOCK_MEDIA_STREAM_DEPENDENCY_FACTORY_H_