Refactor app list so AppsGridView owns the PaginationModel.

ash/wm/app_list_controller.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_WM_APP_LIST_CONTROLLER_H_
 #define ASH_WM_APP_LIST_CONTROLLER_H_
 
 #include "ash/shelf/shelf_icon_observer.h"
 #include "ash/shell_observer.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/timer/timer.h"
 #include "ui/app_list/pagination_model_observer.h"
 #include "ui/aura/client/focus_change_observer.h"
 #include "ui/aura/window_observer.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/events/event_handler.h"
 #include "ui/gfx/rect.h"
 #include "ui/keyboard/keyboard_controller_observer.h"
 #include "ui/views/widget/widget_observer.h"
 
 namespace app_list {
 class ApplicationDragAndDropHost;
 class AppListView;
-class PaginationModel;
 }
 
 namespace ui {
 class LocatedEvent;
 }
 
 namespace ash {
 namespace test {
 class AppListControllerTestApi;
 }
@@ skipping 82 matching lines @@
 
   // ShelfIconObserver overrides:
   virtual void OnShelfIconPositionsChanged() OVERRIDE;
 
   // app_list::PaginationModelObserver overrides:
   virtual void TotalPagesChanged() OVERRIDE;
   virtual void SelectedPageChanged(int old_selected, int new_selected) OVERRIDE;
   virtual void TransitionStarted() OVERRIDE;
   virtual void TransitionChanged() OVERRIDE;
 
-  scoped_ptr<app_list::PaginationModel> pagination_model_;
-
   // Whether we should show or hide app list widget.
   bool is_visible_;
 
   // Whether the app list should remain centered.
   bool is_centered_;
 
   // The AppListView this class manages, owned by its widget.
   app_list::AppListView* view_;
 
+  // The current page of the AppsGridView of |view_|. This is stored outside of
+  // the view's PaginationModel, so that it persists when the view is destroyed.
+  int current_app_page_;
+
   // Cached bounds of |view_| for snapping back animation after over-scroll.
   gfx::Rect view_bounds_;
 
   // Whether should schedule snap back animation.
   bool should_snap_back_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_APP_LIST_CONTROLLER_H_