Add basic Chrome interaction with the mash shelf.

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_
 
 #include "ui/gfx/native_widget_types.h"
 
 namespace ui {
 class Accelerator;
 }  // namespace ui
 
 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 |native_view/native_window| exists within the Ash
 // environment.
 bool IsNativeViewInAsh(gfx::NativeView native_view);
 bool IsNativeWindowInAsh(gfx::NativeWindow native_window);
 
 // 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_