Pass camera facing info to audio client

media/base/video_facing.h

 // Copyright 2017 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 MEDIA_BASE_VIDEO_FACING_H_
 #define MEDIA_BASE_VIDEO_FACING_H_
 
 namespace media {
 
 // Facing mode for video capture.
 enum VideoFacingMode {
   MEDIA_VIDEO_FACING_NONE = 0,
   MEDIA_VIDEO_FACING_USER,
   MEDIA_VIDEO_FACING_ENVIRONMENT,

[satorux1, 2017/02/14 00:58:45]

random idea: I'm not familiar with the terminology here but front-facing and
rear-facing are terms that I often hear. Maybe MEDIA_VIDEO_FRONT_FACING,
MEDIA_VIDEO_REAR_FACING? 

[shenghao, 2017/02/15 03:00:38]

We want to use the same terms as in
https://cs.chromium.org/chromium/src/third_party/WebKit/public/platform/WebMe...

 
   NUM_MEDIA_VIDEO_FACING_MODE

[satorux1, 2017/02/14 00:58:45]

nit: Add 'S' at the end?

[shenghao, 2017/02/15 03:00:38]

Done.

 };
 
+class VideoCaptureObserver {

[satorux1, 2017/02/14 00:58:45]

class comment is missing. I think it'd be good to add.

[shenghao, 2017/02/15 03:00:38]

Done.

+ public:
+  virtual ~VideoCaptureObserver() {}
+  virtual void OnVideoCaptureStarted(VideoFacingMode facing) = 0;
+  virtual void OnVideoCaptureStopped(VideoFacingMode facing) = 0;
+};
+
 }  // namespace media
 
 #endif  // MEDIA_BASE_VIDEO_FACING_H_