Pass camera facing info to audio client

content/public/browser/media_capture_devices.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_PUBLIC_BROWSER_MEDIA_CAPTURE_DEVICES_H_
 #define CONTENT_PUBLIC_BROWSER_MEDIA_CAPTURE_DEVICES_H_
 
 #include "content/public/common/media_stream_request.h"
+#include "media/base/video_facing.h"
 
 namespace content {
 
 // This is a singleton class, used to get Audio/Video devices, it must be
 // called in UI thread.
 class CONTENT_EXPORT  MediaCaptureDevices {
  public:
   // Get signleton instance of MediaCaptureDevices.
   static MediaCaptureDevices* GetInstance();
 
   // Return all Audio/Video devices.
   virtual const MediaStreamDevices& GetAudioCaptureDevices() = 0;
   virtual const MediaStreamDevices& GetVideoCaptureDevices() = 0;
 
+  virtual void AddVideoCaptureObserver(
+      media::VideoCaptureObserver* observer) = 0;
+  virtual void RemoveAllVideoCaptureObservers() = 0;
+
  private:
   // This interface should only be implemented inside content.
   friend class MediaCaptureDevicesImpl;
   MediaCaptureDevices() {}
   virtual ~MediaCaptureDevices() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_MEDIA_CAPTURE_DEVICES_H_