Store audio device's active state in preference

chromeos/audio/audio_devices_pref_handler_impl.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_IMPL_H_
 #define CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_IMPL_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 17 matching lines @@
   explicit AudioDevicesPrefHandlerImpl(PrefService* local_state);
 
   // Overridden from AudioDevicesPrefHandler.
   double GetOutputVolumeValue(const AudioDevice* device) override;
   double GetInputGainValue(const AudioDevice* device) override;
   void SetVolumeGainValue(const AudioDevice& device, double value) override;
 
   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;
   void RemoveAudioPrefObserver(AudioPrefObserver* observer) override;
 
   // Registers volume and mute preferences.
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
  protected:
   ~AudioDevicesPrefHandlerImpl() override;
 
  private:
   // Initializes the observers for the policy prefs.
   void InitializePrefObservers();
 
-  // Update and save methods for the mute preferences for all devices.
-  void UpdateDevicesMutePref();
+  // Load and save methods for the mute preferences for all devices.
+  void LoadDevicesMutePref();
   void SaveDevicesMutePref();
 
-  // Update and save methods for the volume preferences for all devices.
-  void UpdateDevicesVolumePref();
+  // Load and save methods for the volume preferences for all devices.
+  void LoadDevicesVolumePref();
   void SaveDevicesVolumePref();
 
+  // Load and save methods for the active state for all devices.
+  void LoadDevicesStatePref();
+  void SaveDevicesStatePref();
+
   double GetVolumeGainPrefValue(const AudioDevice& device);
   double GetDeviceDefaultOutputVolume(const AudioDevice& device);
 
   // Methods to migrate the mute and volume settings for a device from the
   // previous global pref value to the new per device pref value for the
   // current active device. If a previous global setting doesn't exist, we'll
   // use default values of mute = off and volume = 75%.
   void MigrateDeviceMuteSettings(const std::string& active_device);
   void MigrateDeviceVolumeSettings(const std::string& active_device);
 
   // Notifies the AudioPrefObserver for audio policy pref changes.
   void NotifyAudioPolicyChange();
 
   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
 
   PrefChangeRegistrar pref_change_registrar_;
   base::ObserverList<AudioPrefObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioDevicesPrefHandlerImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_IMPL_H_