Pass camera facing info to audio client

chromeos/audio/cras_audio_handler.cc

Index: chromeos/audio/cras_audio_handler.cc
diff --git a/chromeos/audio/cras_audio_handler.cc b/chromeos/audio/cras_audio_handler.cc
index a6cd9f0e30cfb0d1b64cde3c3ec24acd318642a2..59bca94e8376c69efadb45a1c9bae076f4b58d32 100644
--- a/chromeos/audio/cras_audio_handler.cc
+++ b/chromeos/audio/cras_audio_handler.cc
@@ -126,6 +126,14 @@ CrasAudioHandler* CrasAudioHandler::Get() {
   return g_cras_audio_handler;
 }
 
+void CrasAudioHandler::OnVideoCaptureStarted(VideoFacingMode facing) {
+  // TODO(jennyz): Switch active audio device according to video facing.
+}
+
+void CrasAudioHandler::OnVideoCaptureStopped(VideoFacingMode facing) {
+  // TODO(jennyz): Switch active audio device according to video facing.

[jennyz, 2017/01/26 00:26:11]

Upon receiving video capture stopped notification, how should audio switch
device according to video facing? Will there be another active camera, or both
camera become inactive. How can we find out?

[shenghao, 2017/01/29 10:21:01]

Talked offline with Jenny.

+}
+
 void CrasAudioHandler::AddAudioObserver(AudioObserver* observer) {
   observers_.AddObserver(observer);
 }