Add ALSA support to volume keys

chrome/browser/chromeos/audio_mixer.cc

Index: chrome/browser/chromeos/audio_mixer.cc
diff --git a/chrome/browser/chromeos/audio_mixer.cc b/chrome/browser/chromeos/audio_mixer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..55a37e0beac29f87e4d57c607fdae0b975fe9401
--- /dev/null
+++ b/chrome/browser/chromeos/audio_mixer.cc
@@ -0,0 +1,16 @@
+// Copyright (c) 2010 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 "chrome/browser/chromeos/audio_mixer.h"
+
+namespace chromeos {
+
+AudioMixer::AudioMixer() {
+}
+
+AudioMixer::~AudioMixer() {
+}
+
+}  // namespace chromeos
+