Pass camera facing info to audio client

chromeos/dbus/cras_audio_client.cc

Index: chromeos/dbus/cras_audio_client.cc
diff --git a/chromeos/dbus/cras_audio_client.cc b/chromeos/dbus/cras_audio_client.cc
index 3d63d604e12f89b3668ad7c7118d50d92df107c6..8ef3bb6100b00af81d71fb09a039844baf7034e1 100644
--- a/chromeos/dbus/cras_audio_client.cc
+++ b/chromeos/dbus/cras_audio_client.cc
@@ -8,6 +8,7 @@
 
 #include "base/bind.h"
 #include "base/format_macros.h"
+#include "base/logging.h"
 #include "base/macros.h"
 #include "base/strings/stringprintf.h"
 #include "dbus/bus.h"
@@ -42,6 +43,10 @@ class CrasAudioClientImpl : public CrasAudioClient {
     return observers_.HasObserver(observer);
   }
 
+  void OnVideoCaptureStarted(VideoFacingMode facing) override {
+    // TODO(jennyz): Switch active audio device according to video facing.
+  }
+
   void GetVolumeState(const GetVolumeStateCallback& callback) override {
     dbus::MethodCall method_call(cras::kCrasControlInterface,
                                  cras::kGetVolumeState);