Store audio device's active state in preference

chromeos/chromeos_pref_names.cc

Index: chromeos/chromeos_pref_names.cc
diff --git a/chromeos/chromeos_pref_names.cc b/chromeos/chromeos_pref_names.cc
index e4c69fa2502be63357acf2fd2311f5a460aac6d4..fd7db754ccc89710886ae3b4d4affd76b411b162 100644
--- a/chromeos/chromeos_pref_names.cc
+++ b/chromeos/chromeos_pref_names.cc
@@ -33,6 +33,7 @@ const char kAudioOutputAllowed[] = "hardware.audio_output_enabled";
 // |kAudioDevicesVolumePercent| setting.
 const char kAudioVolumePercent[] = "settings.audio.volume_percent";
 
+const char kAudioDevicesState[] = "settings.audio.device_state";

[Daniel Erat, 2016/01/07 02:46:15]

please add a comment similar to the ones on the other prefs:

- what is it used for?
- what type of pref is this (int, bool)?
- what do the different values mean?

[hychao, 2016/01/07 03:14:15]

Done.

 }  // namespace prefs
 }  // namespace chromeos