Create AudioRendererHost in BrowserRenderProcessHost and hook with ResourceMessageFilter

media/audio/mac/audio_manager_mac.cc

Index: media/audio/mac/audio_manager_mac.cc
diff --git a/media/audio/mac/audio_manager_mac.cc b/media/audio/mac/audio_manager_mac.cc
new file mode 100644
index 0000000000000000000000000000000000000000..15a13b2eab1270532632965405f045dfc2a01f74
--- /dev/null
+++ b/media/audio/mac/audio_manager_mac.cc
@@ -0,0 +1,10 @@
+// Copyright (c) 2006-2009 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 "media/audio/audio_output.h"
+
+// TODO(hclam): Do something more useful than returning NULL.
+AudioManager* AudioManager::GetAudioManager() {
+  return NULL;
+}