It is time.

ui/views/controls/scrollbar/base_scroll_bar_button.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_CONTROLS_SCROLLBAR_BASE_SCROLL_BAR_BUTTON_H_
-#define UI_VIEWS_CONTROLS_SCROLLBAR_BASE_SCROLL_BAR_BUTTON_H_
-
-#include "ui/views/controls/button/custom_button.h"
-
-#include "ui/views/repeat_controller.h"
-
-#if defined(OS_LINUX)
-#include "ui/gfx/screen.h"
-#endif
-
-namespace views {
-
-///////////////////////////////////////////////////////////////////////////////
-//
-// ScrollBarButton
-//
-//  A button that activates on mouse pressed rather than released, and that
-//  continues to fire the clicked action as the mouse button remains pressed
-//  down on the button.
-//
-///////////////////////////////////////////////////////////////////////////////
-class VIEWS_EXPORT BaseScrollBarButton : public CustomButton {
- public:
-  explicit BaseScrollBarButton(ButtonListener* listener);
-  virtual ~BaseScrollBarButton();
-
- protected:
-  virtual bool OnMousePressed(const ui::MouseEvent& event) override;
-  virtual void OnMouseReleased(const ui::MouseEvent& event) override;
-  virtual void OnMouseCaptureLost() override;
-
- private:
-  void RepeaterNotifyClick();
-
-  // The repeat controller that we use to repeatedly click the button when the
-  // mouse button is down.
-  RepeatController repeater_;
-
-  DISALLOW_COPY_AND_ASSIGN(BaseScrollBarButton);
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_CONTROLS_SCROLLBAR_BASE_SCROLL_BAR_BUTTON_H_