Add test coverage for CrasAudioHandler.

chromeos/audio/audio_devices_pref_handler_stub.cc

+// opyright (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];
+}
+
+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];
+}
+
+void AudioDevicesPrefHandlerStub::SetMuteValue(const AudioDevice& device,
+                                               bool mute_on) {
+  audio_device_mute_map_[device.id] = mute_on;
+}
+
+bool AudioDevicesPrefHandlerStub::GetAudioCaptureAllowedValue() {
+  return true;
+}
+
+bool AudioDevicesPrefHandlerStub::GetAudioOutputAllowedValue() {
+  return true;
+}
+
+void AudioDevicesPrefHandlerStub::AddAudioPrefObserver(
+    AudioPrefObserver* observer) {
+}
+
+void AudioDevicesPrefHandlerStub::RemoveAudioPrefObserver(
+    AudioPrefObserver* observer) {
+}
+
+}  // namespace chromeos
+