Replaced BackgroundAnimator with ShelfBackgroundAnimator.

ash/system/status_area_widget.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/status_area_widget.h"
 
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/wm_root_window_controller.h"
 #include "ash/common/wm_shell.h"
@@ skipping 129 matching lines @@
   if (Shell::GetInstance()->in_mus() && shelf_widget_->shelf_layout_manager())
     shelf_widget_->shelf_layout_manager()->UpdateAutoHideForMouseEvent(event);
 }
 
 void StatusAreaWidget::OnGestureEvent(ui::GestureEvent* event) {
   Widget::OnGestureEvent(event);
   if (Shell::GetInstance()->in_mus() && shelf_widget_->shelf_layout_manager())
     shelf_widget_->shelf_layout_manager()->UpdateAutoHideForGestureEvent(event);
 }
 
+void StatusAreaWidget::UpdateShelfItemBackground(int alpha) {
+  web_notification_tray_->UpdateShelfItemBackground(alpha);
+  system_tray_->UpdateShelfItemBackground(alpha);
+#if defined(OS_CHROMEOS)
+  virtual_keyboard_tray_->UpdateShelfItemBackground(alpha);
+  logout_button_tray_->UpdateShelfItemBackground(alpha);
+#endif
+  overview_button_tray_->UpdateShelfItemBackground(alpha);
+}
+
 void StatusAreaWidget::AddSystemTray() {
   system_tray_ = new SystemTray(this);
   status_area_widget_delegate_->AddTray(system_tray_);
 }
 
 void StatusAreaWidget::AddWebNotificationTray() {
   web_notification_tray_ = new WebNotificationTray(this);
   status_area_widget_delegate_->AddTray(web_notification_tray_);
 }
 
@@ skipping 46 matching lines @@
     web_notification_tray_->UpdateAfterLoginStatusChange(login_status);
 #if defined(OS_CHROMEOS)
   if (logout_button_tray_)
     logout_button_tray_->UpdateAfterLoginStatusChange(login_status);
 #endif
   if (overview_button_tray_)
     overview_button_tray_->UpdateAfterLoginStatusChange(login_status);
 }
 
 }  // namespace ash