Add status area to Aura builds.

ui/aura_shell/shell_delegate.h

 // Copyright (c) 2011 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_AURA_SHELL_SHELL_DELEGATE_H_
 #define UI_AURA_SHELL_SHELL_DELEGATE_H_
 #pragma once
 
 #include "ui/aura_shell/aura_shell_export.h"
 
+namespace views {
+class Widget;
+}
+
 namespace aura_shell {
 
 struct LauncherItem;
 
 // Delegate of the Shell.
 class AURA_SHELL_EXPORT ShellDelegate {
  public:
   // The Shell owns the delegate.
   virtual ~ShellDelegate() {}
 
   // Invoked when the user clicks on button in the launcher to create a new
   // window.
   virtual void CreateNewWindow() = 0;
 
+  // Invoked to create a new status area. Can return NULL.
+  virtual views::Widget* CreateStatusArea() = 0;
+
   // Invoked when the user clicks the app list button on the launcher.
   virtual void ShowApps() = 0;
 
   // Invoked when the user clicks on a window entry in the launcher.
   virtual void LauncherItemClicked(const LauncherItem& item) = 0;
 
   // Invoked when a window is added. If the delegate wants the launcher to show
   // an entry for |item->window| it should configure |item| appropriately and
   // return true.
   virtual bool ConfigureLauncherItem(LauncherItem* item) = 0;
 };
 
 }  // namespace aura_shell
 
 #endif  // UI_AURA_SHELL_SHELL_DELEGATE_H_