Implement new audio handler which talks to the new audio dbus apis.

chromeos/audio/audio_pref_names.h

+// Copyright 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_PREF_NAMES_H_
+#define CHROMEOS_AUDIO_AUDIO_PREF_NAMES_H_
+
+namespace chromeos {
+namespace prefs {
+
+// Alphabetical list of preference names specific to audio configurations.
+extern const char kAudioCaptureAllowed[];
+extern const char kAudioMute[];
+extern const char kAudioOutputAllowed[];
+extern const char kAudioVolumePercent[];
+
+}  // namespace prefs
+}  // namespace chromeos
+
+#endif  // CHROMEOS_AUDIO_AUDIO_PREF_NAMES_H_