mash: wires up shadows for mash

ui/views/widget/desktop_aura/desktop_native_widget_aura.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 "ui/views/widget/desktop_aura/desktop_native_widget_aura.h"
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 489 matching lines @@
   if (params.type != Widget::InitParams::TYPE_TOOLTIP) {
     tooltip_manager_.reset(new TooltipManagerAura(GetWidget()));
     tooltip_controller_.reset(
         new corewm::TooltipController(
             desktop_window_tree_host_->CreateTooltip()));
     aura::client::SetTooltipClient(host_->window(),
                                    tooltip_controller_.get());
     host_->window()->AddPreTargetHandler(tooltip_controller_.get());
   }
 
-  if (params.opacity == Widget::InitParams::TRANSLUCENT_WINDOW) {
-    visibility_controller_.reset(new wm::VisibilityController);
+  if (params.opacity == Widget::InitParams::TRANSLUCENT_WINDOW &&
+      desktop_window_tree_host_->ShouldCreateVisibilityController()) {
+    visibility_controller_ = base::MakeUnique<wm::VisibilityController>();
     aura::client::SetVisibilityClient(host_->window(),
                                       visibility_controller_.get());
     wm::SetChildWindowVisibilityChangesAnimated(host_->window());
   }
 
   if (params.type == Widget::InitParams::TYPE_WINDOW) {
     focus_manager_event_handler_ = base::MakeUnique<FocusManagerEventHandler>(
         GetWidget(), host_->window());
   }
 
@@ skipping 674 matching lines @@
   if (cursor_reference_count_ == 0) {
     // We are the last DesktopNativeWidgetAura instance, and we are responsible
     // for cleaning up |cursor_manager_|.
     delete cursor_manager_;
     native_cursor_manager_ = NULL;
     cursor_manager_ = NULL;
   }
 }
 
 }  // namespace views