mash: Move the shelf DimmerView out of shelf_widget.cc.

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"
@@ skipping 86 matching lines @@
   void DisableDimmingAnimationsForTest();
 
   // ShelfBackgroundAnimatorObserver overrides:
   void UpdateShelfItemBackground(int alpha) override;
 
   // ShelfLayoutManagerObserver overrides:
   void WillDeleteShelfLayoutManager() override;
 
  private:
   class DelegateView;
+  friend class DelegateView;

[James Cook, 2016/08/03 03:09:11]

Q: Which access needs the friend?

[msw, 2016/08/03 16:48:24]

It passes |wm_shelf_aura_| to the DimmerView.

 
   // views::Widget:
   void OnMouseEvent(ui::MouseEvent* event) override;
   void OnGestureEvent(ui::GestureEvent* event) override;
 
   WmShelfAura* wm_shelf_aura_;
 
   // Owned by the shelf container's aura::Window.
   ShelfLayoutManager* shelf_layout_manager_;
   std::unique_ptr<Shelf> shelf_;
   StatusAreaWidget* status_area_widget_;
 
   // |delegate_view_| is the contents view of this widget and is cleaned up
   // during CloseChildWindows of the associated RootWindowController.
   DelegateView* delegate_view_;
   ShelfBackgroundAnimator background_animator_;
   bool activating_as_fallback_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfWidget);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_WIDGET_H_