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"
@@ skipping 107 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 pagination model owned by the AppListGridView of |view_|.
+  app_list::PaginationModel* pagination_model_;
+
+  // The current page of the AppListGridView of |view_|. This is stored outside
+  // of |pagination_model_|, 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_