It is time.

ui/views/examples/example_base.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_EXAMPLE_BASE_H_
-#define UI_VIEWS_EXAMPLES_EXAMPLE_BASE_H_
-
-#include <string>
-
-#include "base/macros.h"
-#include "ui/views/examples/views_examples_export.h"
-
-namespace views {
-class View;
-
-namespace examples {
-
-class VIEWS_EXAMPLES_EXPORT ExampleBase {
- public:
-  virtual ~ExampleBase();
-
-  // Sub-classes should creates and add the views to the given parent.
-  virtual void CreateExampleView(View* parent) = 0;
-
-  const std::string& example_title() const { return example_title_; }
-  View* example_view() { return container_; }
-
- protected:
-  explicit ExampleBase(const char* title);
-
-  View* container() { return container_; }
-
-  // Prints a message in the status area, at the bottom of the window.
-  void PrintStatus(const char* format, ...);
-
-  // Converts an boolean value to "on" or "off".
-  const char* BoolToOnOff(bool value) {
-    return value ? "on" : "off";
-  }
-
- private:
-  // Name of the example - used as title in the combobox list.
-  std::string example_title_;
-
-  // The view that contains the views example.
-  View* container_;
-
-  DISALLOW_COPY_AND_ASSIGN(ExampleBase);
-};
-
-}  // namespace examples
-}  // namespace views
-
-#endif  // UI_VIEWS_EXAMPLES_EXAMPLE_BASE_H_