Set up hdmi output device default volume to 100.

chromeos/audio/audio_devices_pref_handler_stub.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_STUB_H_
 #define CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_STUB_H_
 
 #include "chromeos/audio/audio_devices_pref_handler.h"
 
 #include <map>
 
 namespace chromeos {
 
 struct AudioDevice;
 
 // Stub class for AudioDevicesPrefHandler, used for testing.
 class CHROMEOS_EXPORT AudioDevicesPrefHandlerStub
     : public AudioDevicesPrefHandler {
  public:
   typedef std::map<uint64, bool> AudioDeviceMute;
   typedef std::map<uint64, int> AudioDeviceVolumeGain;
 
   AudioDevicesPrefHandlerStub();
 
-  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;
   virtual void RemoveAudioPrefObserver(AudioPrefObserver* observer) OVERRIDE;
 
  protected:
   virtual ~AudioDevicesPrefHandlerStub();
 
  private:
   AudioDeviceMute audio_device_mute_map_;
   AudioDeviceVolumeGain audio_device_volume_gain_map_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioDevicesPrefHandlerStub);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_STUB_H_