Update SetPaintToLayer to accept LayerType

ash/common/system/tray/tray_item_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/common/system/tray/tray_item_view.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/system/tray/system_tray.h"
 #include "ash/common/system/tray/system_tray_item.h"
@@ skipping 12 matching lines @@
 const int kTrayItemAnimationDurationMS = 200;
 
 // Animations can be disabled for testing.
 bool animations_enabled = true;
 }
 
 namespace ash {
 
 TrayItemView::TrayItemView(SystemTrayItem* owner)
     : owner_(owner), label_(NULL), image_view_(NULL) {
-  SetPaintToLayer(true);
+  SetPaintToLayer();
   layer()->SetFillsBoundsOpaquely(false);
   SetLayoutManager(new views::FillLayout());
 }
 
 TrayItemView::~TrayItemView() {}
 
 // static
 void TrayItemView::DisableAnimationsForTest() {
   animations_enabled = false;
 }
@@ skipping 97 matching lines @@
 void TrayItemView::AnimationEnded(const gfx::Animation* animation) {
   if (animation->GetCurrentValue() < 0.1)
     views::View::SetVisible(false);
 }
 
 void TrayItemView::AnimationCanceled(const gfx::Animation* animation) {
   AnimationEnded(animation);
 }
 
 }  // namespace ash