It is time.

ui/views/examples/slider_example.h

-// Copyright (c) 2012 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_EXAMPLES_SLIDER_EXAMPLE_H_
-#define UI_VIEWS_EXAMPLES_SLIDER_EXAMPLE_H_
-
-#include "base/macros.h"
-#include "ui/views/controls/slider.h"
-#include "ui/views/examples/example_base.h"
-
-namespace views {
-class Label;
-
-namespace examples {
-
-class VIEWS_EXAMPLES_EXPORT SliderExample : public ExampleBase,
-                                            public SliderListener {
- public:
-  SliderExample();
-  virtual ~SliderExample();
-
-  // ExampleBase:
-  virtual void CreateExampleView(View* container) override;
-
- private:
-  // SliderListener:
-  virtual void SliderValueChanged(Slider* sender,
-                                  float value,
-                                  float old_value,
-                                  SliderChangeReason reason) override;
-
-  Slider* slider_;
-  Label* label_;
-
-  DISALLOW_COPY_AND_ASSIGN(SliderExample);
-};
-
-}  // namespace examples
-}  // namespace views
-
-#endif  // UI_VIEWS_EXAMPLES_SLIDER_EXAMPLE_H_