Make Chrome limp briefly before freaking out with aura no ash.

ui/aura/desktop/desktop_stacking_client.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/aura/desktop/desktop_stacking_client.h"
 
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 
 namespace aura {
 
 DesktopStackingClient::DesktopStackingClient() {
   aura::client::SetStackingClient(this);
 }
 
 DesktopStackingClient::~DesktopStackingClient() {
   aura::client::SetStackingClient(NULL);
 }
 
 Window* DesktopStackingClient::GetDefaultParent(Window* window) {
-  return window->GetRootWindow();
+  if (!null_parent_.get()) {
+    null_parent_.reset(new aura::RootWindow(gfx::Rect(100, 100)));
+    null_parent_->Init();
+  }
+  return null_parent_.get();
 }
 
 }  // namespace aura