Set up hdmi output device default volume to 100.

chromeos/audio/audio_devices_pref_handler_stub.cc

 // 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.
 
 #include "chromeos/audio/audio_devices_pref_handler_stub.h"
 
 #include "chromeos/audio/audio_device.h"
 
 namespace chromeos {
 
 AudioDevicesPrefHandlerStub::AudioDevicesPrefHandlerStub() {
 }
 
 AudioDevicesPrefHandlerStub::~AudioDevicesPrefHandlerStub() {
 }
 
-double AudioDevicesPrefHandlerStub::GetVolumeGainValue(
-    const AudioDevice& device) {
-  return audio_device_volume_gain_map_[device.id];
+double AudioDevicesPrefHandlerStub::GetOutputVolumeValue(
+    const AudioDevice* device) {
+  if (!device)
+    return 75.0;
+  return audio_device_volume_gain_map_[device->id];
+}
+
+double AudioDevicesPrefHandlerStub::GetInputGainValue(
+    const AudioDevice* device) {
+  if (!device)
+    return 0.0;
+  return audio_device_volume_gain_map_[device->id];
 }
 
 void AudioDevicesPrefHandlerStub::SetVolumeGainValue(const AudioDevice& device,
                                                      double value) {
   audio_device_volume_gain_map_[device.id] = value;
 }
 
 bool AudioDevicesPrefHandlerStub::GetMuteValue(
     const AudioDevice& device) {
   return audio_device_mute_map_[device.id];
@@ skipping 15 matching lines @@
 void AudioDevicesPrefHandlerStub::AddAudioPrefObserver(
     AudioPrefObserver* observer) {
 }
 
 void AudioDevicesPrefHandlerStub::RemoveAudioPrefObserver(
     AudioPrefObserver* observer) {
 }
 
 }  // namespace chromeos