Replaced BackgroundAnimator with ShelfBackgroundAnimator.

ash/system/tray/tray_background_view.cc

 // 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.
 
 #include "ash/system/tray/tray_background_view.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/root_window_controller.h"
@@ skipping 360 matching lines @@
     if (event->type() == ui::ET_GESTURE_TAP_DOWN) {
       SetDrawBackgroundAsActive(true);
     } else if (event->type() ==  ui::ET_GESTURE_SCROLL_BEGIN ||
                event->type() ==  ui::ET_GESTURE_TAP_CANCEL) {
       SetDrawBackgroundAsActive(false);
     }
   }
   ActionableView::OnGestureEvent(event);
 }
 
-void TrayBackgroundView::UpdateBackground(int alpha) {
+void TrayBackgroundView::UpdateBackground(BackgroundAnimator* animator,
+                                          int alpha) {
   // The animator should never fire when the alternate shelf layout is used.
   if (!background_ || draw_background_as_active_)
     return;
   SchedulePaint();
 }
 
 void TrayBackgroundView::SetContents(views::View* contents) {
   SetLayoutManager(new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 0));
   AddChildView(contents);
 }
@@ skipping 175 matching lines @@
     return;
   SchedulePaint();
 }
 
 void TrayBackgroundView::UpdateBubbleViewArrow(
     views::TrayBubbleView* bubble_view) {
   // Nothing to do here.
 }
 
 }  // namespace ash