It is time.

ui/views/corewm/tooltip_win.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_COREWM_TOOLTIP_WIN_H_
-#define UI_VIEWS_COREWM_TOOLTIP_WIN_H_
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/strings/string16.h"
-#include "ui/gfx/point.h"
-#include "ui/views/corewm/tooltip.h"
-
-#include <windows.h>
-#include <commctrl.h>
-
-namespace views {
-namespace corewm {
-
-// Implementation of Tooltip that uses the native win32 control for showing the
-// tooltip.
-class VIEWS_EXPORT TooltipWin : public Tooltip {
- public:
-  explicit TooltipWin(HWND parent);
-  virtual ~TooltipWin();
-
-  // HandleNotify() is forwarded from DesktopWindowTreeHostWin to keep the
-  // native tooltip in sync.
-  bool HandleNotify(int w_param, NMHDR* l_param, LRESULT* l_result);
-
- private:
-  // Ensures |tooltip_hwnd_| is valid. Returns true if valid, false if there
-  // a problem creating |tooltip_hwnd_|.
-  bool EnsureTooltipWindow();
-
-  // Sets the position of the tooltip.
-  void PositionTooltip();
-
-  // Tooltip:
-  virtual void SetText(aura::Window* window,
-                       const base::string16& tooltip_text,
-                       const gfx::Point& location) override;
-  virtual void Show() override;
-  virtual void Hide() override;
-  virtual bool IsVisible() override;
-
-  // The window |tooltip_hwnd_| is parented to.
-  HWND parent_hwnd_;
-
-  // Shows the tooltip.
-  HWND tooltip_hwnd_;
-
-  // Used to modify the tooltip.
-  TOOLINFO toolinfo_;
-
-  // Is the tooltip showing?
-  bool showing_;
-
-  // Location to show the tooltip at. In order to position the tooltip we need
-  // to know the size. The size is only available from TTN_SHOW, so we have to
-  // cache it.
-  gfx::Point location_;
-
-  DISALLOW_COPY_AND_ASSIGN(TooltipWin);
-};
-
-}  // namespace corewm
-}  // namespace views
-
-#endif  // UI_VIEWS_COREWM_TOOLTIP_WIN_H_