Add status area to Aura builds.

ui/aura_shell/shell.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_H_
 #define UI_AURA_SHELL_SHELL_H_
 #pragma once
 
 #include <utility>
 #include <vector>
@@ skipping 22 matching lines @@
 class ShelfLayoutController;
 class WorkspaceController;
 }
 
 // Shell is a singleton object that presents the Shell API and implements the
 // Desktop's delegate interface.
 class AURA_SHELL_EXPORT Shell : public aura::StackingClient {
  public:
   // Upon creation, the Shell sets itself as the Desktop's delegate, which takes
   // ownership of the Shell.
-  Shell();
-  virtual ~Shell();
 
+  // A shell must be explicitly created so that it can call |Init()| with the
+  // delegate set. |delegate| can be NULL (if not required for initialization).
+  static Shell* CreateInstance(ShellDelegate* delegate);
+
+  // Should never be called before |CreateInstance()|.
   static Shell* GetInstance();
 
-  void Init();
-
-  // Sets the delegate. Shell owns its delegate.
-  void SetDelegate(ShellDelegate* delegate);
-  ShellDelegate* delegate() { return delegate_.get(); }
-
   aura::Window* GetContainer(int container_id);
   const aura::Window* GetContainer(int container_id) const;
 
   // Toggles between overview mode and normal mode.
   void ToggleOverview();
 
+  ShellDelegate* delegate() { return delegate_.get(); }
   Launcher* launcher() { return launcher_.get(); }
 
  private:
   typedef std::pair<aura::Window*, gfx::Rect> WindowAndBoundsPair;
 
+  explicit Shell(ShellDelegate* delegate);
+  virtual ~Shell();
+
+  void Init();
+
   // Enables WorkspaceManager.
   void EnableWorkspaceManager();
 
   // Overridden from aura::StackingClient:
   virtual void AddChildToDefaultParent(aura::Window* window) OVERRIDE;
   virtual aura::Window* GetTopmostWindowToActivate(
       aura::Window* ignore) const OVERRIDE;
 
   static Shell* instance_;
 
   std::vector<WindowAndBoundsPair> to_restore_;
 
   base::WeakPtrFactory<Shell> method_factory_;
 
   scoped_ptr<ShellDelegate> delegate_;
 
   scoped_ptr<Launcher> launcher_;
 
   scoped_ptr<internal::WorkspaceController> workspace_controller_;
 
   scoped_ptr<internal::ShelfLayoutController> shelf_layout_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace aura_shell
 
 #endif  // UI_AURA_SHELL_SHELL_H_