Add the beginning of a simple window manager that we'll support on Windows.

ui/views/mus/aura_init.h

 // Copyright 2015 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 UI_VIEWS_MUS_AURA_INIT_H_
 #define UI_VIEWS_MUS_AURA_INIT_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 25 matching lines @@
 class ViewsDelegate;
 
 // Sets up necessary state for aura when run with the viewmanager.
 // |resource_file| is the path to the apk file containing the resources.
 class VIEWS_MUS_EXPORT AuraInit {
  public:
   enum class Mode {
     // Indicates AuraInit should target using aura with mus.
     AURA_MUS,
 
+    // Indicates AuraInit should target using aura with mus, for a Window
+    // Manager client.
+    AURA_MUS_WINDOW_MANAGER,
+
     // Indicates AuraInit should target using ui::Window.
-    UI,
+    UI
   };
 
   // |resource_file| is the file to load strings and 1x icons from.
   // |resource_file_200| can be an empty string, otherwise it is the file to
   // load 2x icons from.
   AuraInit(service_manager::Connector* connector,
            const service_manager::Identity& identity,
            const std::string& resource_file,
            const std::string& resource_file_200 = std::string(),
            scoped_refptr<base::SingleThreadTaskRunner> io_task_runner = nullptr,
@@ skipping 16 matching lines @@
   std::unique_ptr<MusClient> mus_client_;
   std::unique_ptr<aura::Env> env_;
   std::unique_ptr<ViewsDelegate> views_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(AuraInit);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_MUS_AURA_INIT_H_