It is time.

ui/views/widget/native_widget.h

-// Copyright (c) 2011 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_WIDGET_NATIVE_WIDGET_H_
-#define UI_VIEWS_WIDGET_NATIVE_WIDGET_H_
-
-#include "ui/views/widget/widget.h"
-
-namespace views {
-namespace internal {
-class NativeWidgetPrivate;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// NativeWidget interface
-//
-//  An interface that serves as the public API base for the
-//  internal::NativeWidget interface that Widget uses to communicate with a
-//  backend-specific native widget implementation. This is the only component of
-//  this interface that is publicly visible, and exists solely for exposure via
-//  Widget's native_widget() accessor, which code occasionally static_casts to
-//  a known implementation in platform-specific code.
-//
-class VIEWS_EXPORT NativeWidget {
- public:
-  virtual ~NativeWidget() {}
-
- private:
-  friend class Widget;
-
-  virtual internal::NativeWidgetPrivate* AsNativeWidgetPrivate() = 0;
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_H_