[ash-md] Remove the number of animators used for the Shelf animations.

ash/common/shelf/shelf_layout_manager.h

 // Copyright 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_COMMON_SHELF_SHELF_LAYOUT_MANAGER_H_
 #define ASH_COMMON_SHELF_SHELF_LAYOUT_MANAGER_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
 #include "ash/common/session/session_state_observer.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shell_observer.h"
-#include "ash/common/wm/background_animator.h"
 #include "ash/common/wm/dock/docked_window_layout_manager_observer.h"
 #include "ash/common/wm/lock_state_observer.h"
 #include "ash/common/wm/wm_snap_to_pixel_layout_manager.h"
 #include "ash/common/wm/workspace/workspace_types.h"
 #include "ash/common/wm_activation_observer.h"
 #include "ash/public/cpp/shelf_types.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "base/timer/timer.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/keyboard/keyboard_controller_observer.h"
 
 namespace ui {
 class ImplicitAnimationObserver;
 class MouseEvent;
 }
 
 namespace ash {
 
+enum class AnimationChangeType;
 class PanelLayoutManagerTest;
 class ShelfLayoutManagerObserver;
 class ShelfLayoutManagerTest;
 class ShelfWidget;
 class WmShelf;
 
 // ShelfLayoutManager is the layout manager responsible for the shelf and
 // status widgets. The shelf is given the total available width and told the
 // width of the status area. This allows the shelf to draw the background and
 // layout to the status area.
@@ skipping 190 matching lines @@
   void StopAnimating();
 
   // Calculates the target bounds assuming visibility of |visible|.
   void CalculateTargetBounds(const State& state, TargetBounds* target_bounds);
 
   // Updates the target bounds if a gesture-drag is in progress. This is only
   // used by |CalculateTargetBounds()|.
   void UpdateTargetBoundsForGesture(TargetBounds* target_bounds) const;
 
   // Updates the background of the shelf if it has changed.
-  void MaybeUpdateShelfBackground(BackgroundAnimatorChangeType change_type);
+  void MaybeUpdateShelfBackground(AnimationChangeType change_type);
 
   // Updates the auto hide state immediately.
   void UpdateAutoHideStateNow();
 
   // Stops the auto hide timer and clears
   // |mouse_over_shelf_when_auto_hide_timer_started_|.
   void StopAutoHideTimer();
 
   // Returns the bounds of an additional region which can trigger showing the
   // shelf. This region exists to make it easier to trigger showing the shelf
@@ skipping 100 matching lines @@
   // The current shelf background. Should not be assigned to directly, use
   // MaybeUpdateShelfBackground() instead.
   ShelfBackgroundType shelf_background_type_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfLayoutManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SHELF_SHELF_LAYOUT_MANAGER_H_