mash: wires up shadows for mash

ui/views/widget/desktop_aura/desktop_native_widget_aura.cc

Index: ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
diff --git a/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc b/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
index 24cca0c9a39dbf2657a28b6fb14a22ad8d225561..bf221f6c3b542050a03b8a8eee60f129bc2ae058 100644
--- a/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
+++ b/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
@@ -507,8 +507,9 @@ void DesktopNativeWidgetAura::InitNativeWidget(
     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());