mash: Move WmShelfAura ownership to RootWindowController and init it earlier

ash/shelf/shelf_widget.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 ASH_SHELF_SHELF_WIDGET_H_
 #define ASH_SHELF_SHELF_WIDGET_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
 #include "ash/common/shelf/shelf_types.h"
 #include "ash/common/wm/background_animator.h"
 #include "ash/shelf/shelf_layout_manager_observer.h"
 #include "base/macros.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_observer.h"
 
 namespace ash {
 class FocusCycler;
 class Shelf;
 class ShelfLayoutManager;
 class StatusAreaWidget;
+class WmShelfAura;
 class WmWindow;
 class WorkspaceController;
 
 class ASH_EXPORT ShelfWidget : public views::Widget,
                                public views::WidgetObserver,
                                public ShelfLayoutManagerObserver {
  public:
   ShelfWidget(WmWindow* wm_shelf_container,
               WmWindow* wm_status_container,
               WorkspaceController* workspace_controller);
@@ skipping 17 matching lines @@
   bool IsShelfHiddenBehindBlackBar() const;
 
   // Causes shelf items to be slightly dimmed (e.g. when a window is maximized).
   void SetDimsShelf(bool dimming);
   bool GetDimsShelf() const;
 
   ShelfLayoutManager* shelf_layout_manager() { return shelf_layout_manager_; }
   Shelf* shelf() const { return shelf_.get(); }
   StatusAreaWidget* status_area_widget() const { return status_area_widget_; }
 
-  void CreateShelf();
+  void CreateShelf(WmShelfAura* wm_shelf_aura);
   void PostCreateShelf();
 
   // Set visibility of the shelf.
   void SetShelfVisibility(bool visible);
   bool IsShelfVisible() const;
 
   // Sets the focus cycler.  Also adds the shelf to the cycle.
   void SetFocusCycler(FocusCycler* focus_cycler);
   FocusCycler* GetFocusCycler();
 
@@ skipping 41 matching lines @@
   DelegateView* delegate_view_;
   BackgroundAnimator background_animator_;
   bool activating_as_fallback_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfWidget);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_WIDGET_H_