It is time.

ui/views/examples/progress_bar_example.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_EXAMPLES_PROGRESS_BAR_EXAMPLE_H_
-#define UI_VIEWS_EXAMPLES_PROGRESS_BAR_EXAMPLE_H_
-
-#include "base/macros.h"
-#include "ui/views/controls/button/button.h"
-#include "ui/views/examples/example_base.h"
-
-namespace views {
-class ProgressBar;
-
-namespace examples {
-
-class VIEWS_EXAMPLES_EXPORT ProgressBarExample : public ExampleBase,
-                                                 public ButtonListener {
- public:
-  ProgressBarExample();
-  virtual ~ProgressBarExample();
-
-  // ExampleBase:
-  virtual void CreateExampleView(View* container) override;
-
- private:
-  // ButtonListener:
-  virtual void ButtonPressed(Button* button, const ui::Event& event) override;
-
-  Button* minus_button_;
-  Button* plus_button_;
-  ProgressBar* progress_bar_;
-  double current_percent_;
-
-  DISALLOW_COPY_AND_ASSIGN(ProgressBarExample);
-};
-
-}  // namespace examples
-}  // namespace views
-
-#endif  // UI_VIEWS_EXAMPLES_PROGRESS_BAR_EXAMPLE_H_