app_shell: Do simple audio initialization.

chromeos/dbus/dbus_thread_manager.h

 // Copyright (c) 2012 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_DBUS_DBUS_THREAD_MANAGER_H_
 #define CHROMEOS_DBUS_DBUS_THREAD_MANAGER_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 70 matching lines @@
 // WeakPtrFactory when creating callbacks that run on UI thread. See
 // session_manager_client.cc for examples.
 //
 class CHROMEOS_EXPORT DBusThreadManager {
  public:
   // Sets the global instance. Must be called before any calls to Get().
   // We explicitly initialize and shut down the global object, rather than
   // making it a Singleton, to ensure clean startup and shutdown.
   static void Initialize();
 
-  // Returns DBusThreadManagerSetter instance that allows tests to
-  // replace individual dbus clients with their own implementations.
+  // Returns a DBusThreadManagerSetter instance that allows tests to
+  // replace individual D-Bus clients with their own implementations.
+  // Also initializes the main DBusThreadManager for testing if necessary.
   static scoped_ptr<DBusThreadManagerSetter> GetSetterForTesting();
 
   // Returns true if DBusThreadManager has been initialized. Call this to
   // avoid initializing + shutting down DBusThreadManager more than once.
   static bool IsInitialized();
 
   // Destroys the global instance.
   static void Shutdown();
 
   // Gets the global instance. Initialize() must be called first.
@@ skipping 135 matching lines @@
   friend class DBusThreadManager;
 
   DBusThreadManagerSetter();
 
   DISALLOW_COPY_AND_ASSIGN(DBusThreadManagerSetter);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_DBUS_THREAD_MANAGER_H_