Add rudimentary mash shelf functionality.

mash/shell/shell_application_delegate.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 MASH_SHELL_SHELL_APPLICATION_DELEGATE_H_
 #define MASH_SHELL_SHELL_APPLICATION_DELEGATE_H_
 
 #include <map>
 
 #include "base/callback.h"
@@ skipping 14 matching lines @@
   ~ShellApplicationDelegate() override;
 
  private:
   // mojo::ApplicationDelegate:
   void Initialize(mojo::ApplicationImpl* app) override;
   bool ConfigureIncomingConnection(
       mojo::ApplicationConnection* connection) override;
 
   void StartWindowManager();
   void StartWallpaper();
-  void StartSystemUI();
+  void StartShelf();
   void StartBrowserDriver();
   void StartQuickLaunch();
 
   // Starts the application at |url|, running |restart_callback| if the
   // connection to the application is closed.
   void StartRestartableService(const std::string& url,
                                const base::Closure& restart_callback);
 
   mojo::ApplicationImpl* app_;
   std::map<std::string, scoped_ptr<mojo::ApplicationConnection>> connections_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellApplicationDelegate);
 };
 
 }  // namespace shell
 }  // namespace mash
 
 #endif  // MASH_SHELL_SHELL_APPLICATION_DELEGATE_H_