It is time.

ui/views/view_constants_aura.h

-// Copyright 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 UI_VIEWS_VIEW_CONSTANTS_AURA_H_
-#define UI_VIEWS_VIEW_CONSTANTS_AURA_H_
-
-#include "ui/aura/window.h"
-#include "ui/views/views_export.h"
-
-namespace views {
-class View;
-
-// A property key to indicate the view the window is associated with. If
-// specified, the z-order of the view, relative to other views, dictates the
-// z-order of the window and its associated layer. The associated view must
-// have the same parent widget as the window on which the property is set.
-VIEWS_EXPORT extern const aura::WindowProperty<View*>* const kHostViewKey;
-
-// A property key to indicate if a window is a desktop root window or not.
-// This property is currently set during creation of desktop root window.
-VIEWS_EXPORT extern const aura::WindowProperty<bool>* const kDesktopRootWindow;
-
-}  // namespace views
-
-#endif  // UI_VIEWS_VIEW_CONSTANTS_AURA_H_