mash: Have chrome set itself as a controller interface for changing volume

chrome/browser/ui/ash/ash_util.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 CHROME_BROWSER_UI_ASH_ASH_UTIL_H_
 #define CHROME_BROWSER_UI_ASH_ASH_UTIL_H_
 
 namespace ui {
 class Accelerator;
 }  // namespace ui
 
+namespace ash_util {
+
+// Returns the name of the ash service depending on whether the browser is
+// running in classic ash or mash.
+const char* GetAshServiceName();
+
+}  // namespace ash_util
+
+// TODO(jamescook): Change this namespace to ash_util.
 namespace chrome {
 
 // Returns true if Ash should be run at startup.
 bool ShouldOpenAshOnStartup();
 
 // Returns true if Chrome is running in the mash shell.
 bool IsRunningInMash();
 
 // Returns true if the given |accelerator| has been deprecated and hence can
 // be consumed by web contents if needed.
 bool IsAcceleratorDeprecated(const ui::Accelerator& accelerator);
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_ASH_ASH_UTIL_H_