[ABANDONED] Simplify ash shelf dimmer.

ash/shelf/shelf_widget.h

Index: ash/shelf/shelf_widget.h
diff --git a/ash/shelf/shelf_widget.h b/ash/shelf/shelf_widget.h
index af6de3defeb81d3fd61485a5edb71f769c09d5db..9b125ac77225146aa2db81a9855f58a78278ec0f 100644
--- a/ash/shelf/shelf_widget.h
+++ b/ash/shelf/shelf_widget.h
@@ -80,27 +80,18 @@ class ASH_EXPORT ShelfWidget : public views::Widget,
   // 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;