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

ui/app_list/views/apps_container_view.h

Index: ui/app_list/views/apps_container_view.h
diff --git a/ui/app_list/views/apps_container_view.h b/ui/app_list/views/apps_container_view.h
index 1c8a9131a6cb201aa5e0b44223f77cbeb6024297..1be5d3dd3a4413c1f9c1ebaa4fe5f79440cbf12e 100644
--- a/ui/app_list/views/apps_container_view.h
+++ b/ui/app_list/views/apps_container_view.h
@@ -43,6 +43,12 @@ class AppsContainerView : public views::View,
   // a folder view with |folder_item|. If |folder_item| is NULL skips animation.
   void ShowApps(AppListFolderItem* folder_item);
 
+  // Resets the app list to a state where it shows the main grid view. This is
+  // called when the user opens the launcher for the first time or when the user
+  // hides and then shows it. This is necessary because we only hide and show
+  // the launcher on Windows and Linux so we need to reset to a fresh state.
+  void ResetForShowApps();
+
   // Sets |drag_and_drop_host_| for the current app list in both
   // app_list_folder_view_ and root level apps_grid_view_.
   void SetDragAndDropHostOfCurrentAppList(