Set up hdmi output device default volume to 100.

chrome/browser/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 CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_IMPL_H_
 #define CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_IMPL_H_
 
 #include "base/observer_list.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "base/values.h"
 #include "chromeos/audio/audio_devices_pref_handler.h"
 
 class PrefRegistrySimple;
 class PrefService;
 
 namespace chromeos {
 
 // Class which implements AudioDevicesPrefHandler interface and register audio
 // preferences as well.
 class AudioDevicesPrefHandlerImpl : public AudioDevicesPrefHandler {
  public:
   explicit AudioDevicesPrefHandlerImpl(PrefService* local_state);
 
   // Overridden from AudioDevicesPrefHandler.
-  virtual double GetVolumeGainValue(const AudioDevice& device) OVERRIDE;
+  virtual double GetOutputVolumeValue(const AudioDevice* device) OVERRIDE;
+  virtual double GetInputGainValue(const AudioDevice* device) OVERRIDE;
   virtual void SetVolumeGainValue(const AudioDevice& device,
                                   double value) OVERRIDE;
 
   virtual bool GetMuteValue(const AudioDevice& device) OVERRIDE;
   virtual void SetMuteValue(const AudioDevice& device, bool mute_on) OVERRIDE;
 
   virtual bool GetAudioCaptureAllowedValue() OVERRIDE;
   virtual bool GetAudioOutputAllowedValue() OVERRIDE;
 
   virtual void AddAudioPrefObserver(AudioPrefObserver* observer) OVERRIDE;
@@ skipping 10 matching lines @@
   void InitializePrefObservers();
 
   // Update and save methods for the mute preferences for all devices.
   void UpdateDevicesMutePref();
   void SaveDevicesMutePref();
 
   // Update and save methods for the volume preferences for all devices.
   void UpdateDevicesVolumePref();
   void SaveDevicesVolumePref();
 
+  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(std::string active_device);
   void MigrateDeviceVolumeSettings(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_;
 
   PrefService* local_state_;  // not owned
   PrefChangeRegistrar pref_change_registrar_;
   ObserverList<AudioPrefObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioDevicesPrefHandlerImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_IMPL_H_