Pass camera facing info to audio client

content/public/browser/media_capture_devices.h

Index: content/public/browser/media_capture_devices.h
diff --git a/content/public/browser/media_capture_devices.h b/content/public/browser/media_capture_devices.h
index 925fff66c25163756ba535496cdfdf35286128f2..9ed92c2a5ad01ba525ff5aa04d03555c9d5833e8 100644
--- a/content/public/browser/media_capture_devices.h
+++ b/content/public/browser/media_capture_devices.h
@@ -6,6 +6,7 @@
 #define CONTENT_PUBLIC_BROWSER_MEDIA_CAPTURE_DEVICES_H_
 
 #include "content/public/common/media_stream_request.h"
+#include "media/base/video_facing.h"
 
 namespace content {
 
@@ -20,6 +21,10 @@ class CONTENT_EXPORT  MediaCaptureDevices {
   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;