mash: Migrate //ash/system/toast to WM common types

ash/common/system/toast/toast_overlay.h

 // Copyright 2016 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_SYSTEM_TOAST_TOAST_OVERLAY_H_
-#define ASH_SYSTEM_TOAST_TOAST_OVERLAY_H_
+#ifndef ASH_COMMON_SYSTEM_TOAST_TOAST_OVERLAY_H_
+#define ASH_COMMON_SYSTEM_TOAST_TOAST_OVERLAY_H_
 
 #include <memory>
+#include <string>
 
 #include "ash/ash_export.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/events/event.h"
 #include "ui/events/event_constants.h"
 #include "ui/gfx/geometry/size.h"
-#include "ui/views/view.h"
 
 namespace gfx {
 class Rect;
 }
 
 namespace views {
 class Widget;
 }
 
 namespace ash {
@@ skipping 20 matching lines @@
 
   // Shows or hides the overlay.
   void Show(bool visible);
 
  private:
   friend class ToastManagerTest;
 
   // Returns the current bounds of the overlay, which is based on visibility.
   gfx::Rect CalculateOverlayBounds();
 
+  // ui::ImplicitAnimationObserver:
   void OnImplicitAnimationsScheduled() override;
   void OnImplicitAnimationsCompleted() override;
 
   views::Widget* widget_for_testing();
   void ClickDismissButtonForTesting(const ui::Event& event);
 
   Delegate* const delegate_;
   const std::string text_;
   const std::string dismiss_text_;
   std::unique_ptr<views::Widget> overlay_widget_;
   std::unique_ptr<ToastOverlayView> overlay_view_;
   gfx::Size widget_size_;
 
   DISALLOW_COPY_AND_ASSIGN(ToastOverlay);
 };
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_TOAST_TOAST_OVERLAY_H_
+#endif  // ASH_COMMON_SYSTEM_TOAST_TOAST_OVERLAY_H_