ash: Add RootWindowHostFactory class.

ash/shell/shell_delegate_impl.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/shell/shell_delegate_impl.h"
 
 #include "ash/caps_lock_delegate_stub.h"
+#include "ash/host/root_window_host_factory.h"
 #include "ash/shell/example_factory.h"
 #include "ash/shell/launcher_delegate_impl.h"
 #include "ash/shell/context_menu.h"
 #include "ash/shell/toplevel_window.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/stacking_controller.h"
 #include "ash/wm/window_util.h"
 #include "base/message_loop.h"
 #include "ui/aura/window.h"
 
@@ skipping 187 matching lines @@
 }
 
 aura::client::StackingClient* ShellDelegateImpl::CreateStackingClient() {
   return new StackingController;
 }
 
 bool ShellDelegateImpl::IsSearchKeyActingAsFunctionKey() const {
   return false;
 }
 
+RootWindowHostFactory* ShellDelegateImpl::CreateRootWindowHostFactory() {
+  return RootWindowHostFactory::Create();
+}
+
 }  // namespace shell
 }  // namespace ash