MuteSource Audio During Full Screen Cast

media/audio/audio_device_description.h

Index: media/audio/audio_device_description.h
diff --git a/media/audio/audio_device_description.h b/media/audio/audio_device_description.h
index ed8d803883c2039e734e6195d2f90d1c62c3582f..bc70e237fd065659a08058cb30eff5a68b9b63c5 100644
--- a/media/audio/audio_device_description.h
+++ b/media/audio/audio_device_description.h
@@ -31,6 +31,10 @@ class MEDIA_EXPORT AudioDeviceDescription {
   // stream, otherwise stream initialization may fail.
   static const char kLoopbackInputDeviceId[];
 
+  // Similar to |kLoopbackInputDeviceId|, with only difference that this ID
+  // will mute system audio during capturing.
+  static const char kLoopbackWithMuteDeviceId[];
+
   // Returns true if |device_id| represents the default device.
   static bool IsDefaultDevice(const std::string& device_id);