Move app list from ash to ui.

ash/app_list/pagination_model.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 ASH_APP_LIST_PAGINATION_MODEL_H_
-#define ASH_APP_LIST_PAGINATION_MODEL_H_
-#pragma once
-
-#include "ash/ash_export.h"
-#include "base/basictypes.h"
-#include "base/observer_list.h"
-
-namespace ash {
-
-class PaginationModelObserver;
-
-// A simple pagination model that consists of two numbers: the total pages and
-// the currently selected page. The model is a single selection model that at
-// the most one page can become selected at any time.
-class ASH_EXPORT PaginationModel {
- public:
-  PaginationModel();
-  ~PaginationModel();
-
-  void SetTotalPages(int total_pages);
-  void SelectPage(int page);
-
-  void AddObserver(PaginationModelObserver* observer);
-  void RemoveObserver(PaginationModelObserver* observer);
-
-  int total_pages() const {
-    return total_pages_;
-  }
-
-  int selected_page() const {
-    return selected_page_;
-  }
-
- private:
-  int total_pages_;
-  int selected_page_;
-  ObserverList<PaginationModelObserver> observers_;
-
-  DISALLOW_COPY_AND_ASSIGN(PaginationModel);
-};
-
-}  // namespace ash
-
-#endif  // ASH_APP_LIST_PAGINATION_MODEL_H_