Adds the ability to run chromeos with mus

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 <memory>
 
 #include "base/memory/ref_counted.h"
 #include "base/single_thread_task_runner.h"
 
 namespace service_manager {
 class Service;
 }
 
 namespace ui {
 class Accelerator;
 }  // namespace ui
 
 namespace ash_util {
 
+enum class Config {
+  // Classic mode does not use mus.
+  CLASSIC,
+
+  // Aura is backed by mus, but chrome and ash are still in the same process.
+  MUS,
+
+  // Aura is backed by mus and chrome and ash are in separate processes. In this
+  // mode chrome code can only use ash code in ash/public/cpp.
+  MASH,
+};
+
 // Creates an in-process Service instance of which can host common ash
 // interfaces.
 std::unique_ptr<service_manager::Service> CreateEmbeddedAshService(
     const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
 
 // Returns true if Ash should be run at startup.
 bool ShouldOpenAshOnStartup();
 
 // Returns true if Chrome is running in the mash shell.
+// TODO(sky): convert to GetConfig().
 bool IsRunningInMash();
 
+Config GetConfig();
+
 // 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 ash_util
 
 #endif  // CHROME_BROWSER_UI_ASH_ASH_UTIL_H_