Implement getMediaDevices.

content/renderer/media/mock_media_stream_dispatcher.h

Index: content/renderer/media/mock_media_stream_dispatcher.h
diff --git a/content/renderer/media/mock_media_stream_dispatcher.h b/content/renderer/media/mock_media_stream_dispatcher.h
index d16f32d6f3fe08349ef1c724276da44da64c976f..c6242636ac481850d4e08b4059b6f64d6ec89492 100644
--- a/content/renderer/media/mock_media_stream_dispatcher.h
+++ b/content/renderer/media/mock_media_stream_dispatcher.h
@@ -27,12 +27,18 @@ class MockMediaStreamDispatcher : public MediaStreamDispatcher {
       int request_id,
       const base::WeakPtr<MediaStreamDispatcherEventHandler>&
           event_handler) OVERRIDE;
+  virtual void EnumerateDevices(
+      int request_id,
+      const base::WeakPtr<MediaStreamDispatcherEventHandler>& event_handler,
+      MediaStreamType type,
+      const GURL& security_origin) OVERRIDE;
   virtual void StopStreamDevice(const StreamDeviceInfo& device_info) OVERRIDE;
   virtual bool IsStream(const std::string& label) OVERRIDE;
   virtual int video_session_id(const std::string& label, int index) OVERRIDE;
   virtual int audio_session_id(const std::string& label, int index) OVERRIDE;
 
-  int request_id() const { return request_id_; }
+  int audio_request_id() const { return audio_request_id_; }
+  int video_request_id() const { return video_request_id_; }
   int request_stream_counter() const { return request_stream_counter_; }
   void IncrementSessionId() { ++session_id_; }
 
@@ -44,7 +50,11 @@ class MockMediaStreamDispatcher : public MediaStreamDispatcher {
   StreamDeviceInfoArray video_array() const { return video_array_; }
 
  private:
-  int request_id_;
+  void AddAudioDeviceToArray();
+  void AddVideoDeviceToArray();
+
+  int audio_request_id_;
+  int video_request_id_;  // Only used for EnumerateDevices.
   base::WeakPtr<MediaStreamDispatcherEventHandler> event_handler_;
   int request_stream_counter_;
   int stop_audio_device_counter_;