Add window manager component.

wm/host/root_window_host_factory.h

+// Copyright (c) 2013 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.
+
+#ifndef WM_HOST_ROOT_WINDOW_FACTORY_HOST_H_
+#define WM_HOST_ROOT_WINDOW_FACTORY_HOST_H_
+
+#include "ash/host/root_window_host_factory.h"
+
+namespace wm {
+
+class RootWindowHostFactory : public ash::RootWindowHostFactory {
+ public:
+  virtual ~RootWindowHostFactory() {}
+
+  static RootWindowHostFactory* Create();
+
+ protected:
+  RootWindowHostFactory() {}
+};
+
+}  // namespace wm
+
+#endif  // WM_HOST_ROOT_WINDOW_HOST_FACTORY_H_