Store audio device's active state in preference

chromeos/audio/audio_devices_pref_handler_impl.h

Index: chromeos/audio/audio_devices_pref_handler_impl.h
diff --git a/chromeos/audio/audio_devices_pref_handler_impl.h b/chromeos/audio/audio_devices_pref_handler_impl.h
index 72dc335c4b5d03ce6096de3353db1730396a2fa9..31ee5441ec72501dc83fcf7c7399153abbd4faf7 100644
--- a/chromeos/audio/audio_devices_pref_handler_impl.h
+++ b/chromeos/audio/audio_devices_pref_handler_impl.h
@@ -34,6 +34,10 @@ class CHROMEOS_EXPORT AudioDevicesPrefHandlerImpl
   bool GetMuteValue(const AudioDevice& device) override;
   void SetMuteValue(const AudioDevice& device, bool mute_on) override;
 
+  AudioDeviceState GetDeviceState(const AudioDevice &device) override;
+  void SetDeviceState(const AudioDevice& device,
+                      AudioDeviceState state) override;
+
   bool GetAudioOutputAllowedValue() override;
 
   void AddAudioPrefObserver(AudioPrefObserver* observer) override;
@@ -57,6 +61,10 @@ class CHROMEOS_EXPORT AudioDevicesPrefHandlerImpl
   void UpdateDevicesVolumePref();
   void SaveDevicesVolumePref();
 
+  // Update and save methods for the active state for all devices.
+  void UpdateDevicesStatePref();
+  void SaveDevicesStatePref();
+
   double GetVolumeGainPrefValue(const AudioDevice& device);
   double GetDeviceDefaultOutputVolume(const AudioDevice& device);
 
@@ -72,6 +80,7 @@ class CHROMEOS_EXPORT AudioDevicesPrefHandlerImpl
 
   scoped_ptr<base::DictionaryValue> device_mute_settings_;
   scoped_ptr<base::DictionaryValue> device_volume_settings_;
+  scoped_ptr<base::DictionaryValue> device_state_settings_;
 
   PrefService* local_state_;  // not owned