Update SetPaintToLayer to accept LayerType

ui/arc/notification/arc_custom_notification_view.cc

 // 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.
 
 #include "ui/arc/notification/arc_custom_notification_view.h"
 
 #include "ash/wm/window_util.h"
 #include "base/auto_reset.h"
 #include "base/memory/ptr_util.h"
 #include "components/exo/notification_surface.h"
@@ skipping 220 matching lines @@
   item_->IncrementWindowRefCount();
   item_->AddObserver(this);
 
   ArcNotificationSurfaceManager::Get()->AddObserver(this);
   exo::NotificationSurface* surface =
       ArcNotificationSurfaceManager::Get()->GetSurface(notification_key_);
   if (surface)
     OnNotificationSurfaceAdded(surface);
 
   // Create a layer as an anchor to insert surface copy during a slide.
-  SetPaintToLayer(true);
+  SetPaintToLayer();
   UpdatePreferredSize();
 }
 
 ArcCustomNotificationView::~ArcCustomNotificationView() {
   SetSurface(nullptr);
   if (item_) {
     item_->DecrementWindowRefCount();
     item_->RemoveObserver(this);
   }
 
@@ skipping 290 matching lines @@
 
 void ArcCustomNotificationView::OnNotificationSurfaceRemoved(
     exo::NotificationSurface* surface) {
   if (surface->notification_id() != notification_key_)
     return;
 
   SetSurface(nullptr);
 }
 
 }  // namespace arc