Pass camera facing info to audio client

content/browser/renderer_host/media/video_capture_manager.h

Index: content/browser/renderer_host/media/video_capture_manager.h
diff --git a/content/browser/renderer_host/media/video_capture_manager.h b/content/browser/renderer_host/media/video_capture_manager.h
index 569910d09d1f9dc23b58ef29c11c1f3b9b559652..a1d96a1da53326dc08fd1d1ed0fa369987c6987c 100644
--- a/content/browser/renderer_host/media/video_capture_manager.h
+++ b/content/browser/renderer_host/media/video_capture_manager.h
@@ -21,6 +21,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
+#include "base/observer_list.h"
 #include "base/process/process_handle.h"
 #include "base/threading/thread_checker.h"
 #include "base/timer/elapsed_timer.h"
@@ -29,6 +30,7 @@
 #include "content/browser/renderer_host/media/video_capture_controller_event_handler.h"
 #include "content/common/content_export.h"
 #include "content/common/media/media_stream_options.h"
+#include "media/base/video_facing.h"
 #include "media/capture/video/video_capture_device.h"
 #include "media/capture/video/video_capture_device_factory.h"
 #include "media/capture/video_capture_types.h"
@@ -54,6 +56,16 @@ class CONTENT_EXPORT VideoCaptureManager : public MediaStreamProvider {
       std::unique_ptr<media::VideoCaptureDeviceFactory> factory,
       scoped_refptr<base::SingleThreadTaskRunner> device_task_runner);
 
+  // AddVideoCaptureObserver() can be called only before any devices are opened.
+  // RemoveAllVideoCaptureObservers() can be called only after all devices
+  // are closed.
+  // They can be called more than once and it's ok to not call at all if the
+  // client is not interested in receiving media::VideoCaptureObserver callacks.
+  // This methods can be called on whatever thread. The callbacks of
+  // media::VideoCaptureObserver arrive on browser IO thread.
+  void AddVideoCaptureObserver(media::VideoCaptureObserver* observer);
+  void RemoveAllVideoCaptureObservers();
+
   // Implements MediaStreamProvider.
   void RegisterListener(MediaStreamProviderListener* listener) override;
   void UnregisterListener() override;
@@ -341,6 +353,8 @@ class CONTENT_EXPORT VideoCaptureManager : public MediaStreamProvider {
   std::unique_ptr<media::VideoCaptureDeviceFactory>
       video_capture_device_factory_;
 
+  base::ObserverList<media::VideoCaptureObserver> capture_observers_;
+
   // Local cache of the enumerated video capture devices' names and capture
   // supported formats. A snapshot of the current devices and their capabilities
   // is composed in VideoCaptureDeviceFactory::EnumerateDeviceNames() and