It is time.

ui/views/examples/scroll_view_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_SCROLL_VIEW_EXAMPLE_H_
-#define UI_VIEWS_EXAMPLES_SCROLL_VIEW_EXAMPLE_H_
-
-#include <string>
-
-#include "base/macros.h"
-#include "ui/views/controls/button/button.h"
-#include "ui/views/controls/scroll_view.h"
-#include "ui/views/examples/example_base.h"
-
-namespace views {
-
-class LabelButton;
-
-namespace examples {
-
-class VIEWS_EXAMPLES_EXPORT ScrollViewExample : public ExampleBase,
-                                                public ButtonListener {
- public:
-  ScrollViewExample();
-  virtual ~ScrollViewExample();
-
-  // ExampleBase:
-  virtual void CreateExampleView(View* container) override;
-
- private:
-  // ButtonListener:
-  virtual void ButtonPressed(Button* sender, const ui::Event& event) override;
-
-  // Control buttons to change the size of scrollable and jump to
-  // predefined position.
-  LabelButton* wide_;
-  LabelButton* tall_;
-  LabelButton* big_square_;
-  LabelButton* small_square_;
-  LabelButton* scroll_to_;
-
-  class ScrollableView;
-  // The content of the scroll view.
-  ScrollableView* scrollable_;
-
-  // The scroll view to test.
-  ScrollView* scroll_view_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScrollViewExample);
-};
-
-}  // namespace examples
-}  // namespace views
-
-#endif  // UI_VIEWS_EXAMPLES_SCROLL_VIEW_EXAMPLE_H_