It is time.

ui/views/examples/bubble_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_BUBBLE_EXAMPLE_H_
-#define UI_VIEWS_EXAMPLES_BUBBLE_EXAMPLE_H_
-
-#include "ui/views/controls/button/button.h"
-#include "ui/views/examples/example_base.h"
-
-namespace views {
-namespace examples {
-
-// A Bubble example.
-class VIEWS_EXAMPLES_EXPORT BubbleExample : public ExampleBase,
-                                            public ButtonListener {
- public:
-  BubbleExample();
-  virtual ~BubbleExample();
-
-  // ExampleBase:
-  virtual void CreateExampleView(View* container) override;
-
- private:
-  // ButtonListener:
-  virtual void ButtonPressed(Button* sender, const ui::Event& event) override;
-
-  Button* no_shadow_;
-  Button* big_shadow_;
-  Button* small_shadow_;
-  Button* align_to_edge_;
-  Button* persistent_;
-
-  DISALLOW_COPY_AND_ASSIGN(BubbleExample);
-};
-
-}  // namespace examples
-}  // namespace views
-
-#endif  // UI_VIEWS_EXAMPLES_BUBBLE_EXAMPLE_H_