Reset the app list when it is shown on Windows and Linux.

ui/app_list/views/apps_grid_view.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_APP_LIST_VIEWS_APPS_GRID_VIEW_H_
 #define UI_APP_LIST_VIEWS_APPS_GRID_VIEW_H_
 
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 65 matching lines @@
                PaginationModel* pagination_model);
   virtual ~AppsGridView();
 
   // Sets fixed layout parameters. After setting this, CalculateLayout below
   // is no longer called to dynamically choosing those layout params.
   void SetLayout(int icon_size, int cols, int rows_per_page);
 
   int cols() { return cols_; }
   int rows_per_page() { return rows_per_page_; }
 
+  // This resets the grid view to a fresh state for showing the app list.
+  void ResetForShowApps();
+
   // Sets |model| to use. Note this does not take ownership of |model|.
   void SetModel(AppListModel* model);
 
   // Sets the |item_list| to render. Note this does not take ownership of
   // |item_list|.
   void SetItemList(AppListItemList* item_list);
 
   void SetSelectedView(views::View* view);
   void ClearSelectedView(views::View* view);
   void ClearAnySelectedView();
@@ skipping 436 matching lines @@
   bool dragging_for_reparent_item_;
 
   base::WeakPtrFactory<AppsGridView> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AppsGridView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_APPS_GRID_VIEW_H_