[ABANDONED] Simplify ash shelf dimmer.

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 62 matching lines @@
   // Called by the activation delegate, before the shelf is activated
   // when no other windows are visible.
   void WillActivateAsFallback() { activating_as_fallback_ = true; }
 
   // Clean up prior to deletion.
   void Shutdown();
 
   // Force the shelf to be presented in an undimmed state.
   void ForceUndimming(bool force);
 
-  // Overridden from views::WidgetObserver:
+  // views::WidgetObserver:
   void OnWidgetActivationChanged(views::Widget* widget, bool active) override;
 
-  // A function to test the current alpha used by the dimming bar. If there is
-  // no dimmer active, the function will return -1.
-  int GetDimmingAlphaForTest();
-
-  // A function to test the bounds of the dimming bar. Returns gfx::Rect() if
-  // the dimmer is inactive.
-  gfx::Rect GetDimmerBoundsForTest();
-
-  // Disable dimming animations for running tests.
-  void DisableDimmingAnimationsForTest();
-
-  // ShelfLayoutManagerObserver overrides:
+  // ShelfLayoutManagerObserver:
   void WillDeleteShelfLayoutManager() override;
 
  private:
   class DelegateView;
 
   // views::Widget:
+  void OnDragEnter() override;
+  void OnDragExit() override;
   void OnMouseEvent(ui::MouseEvent* event) override;
   void OnGestureEvent(ui::GestureEvent* event) override;
 
   // 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_;
   BackgroundAnimator background_animator_;
   bool activating_as_fallback_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfWidget);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_WIDGET_H_