Fix app list drag view being hidden on reparent when synchronous drag is setting up.

ui/app_list/views/apps_grid_view_folder_delegate.h

Index: ui/app_list/views/apps_grid_view_folder_delegate.h
diff --git a/ui/app_list/views/apps_grid_view_folder_delegate.h b/ui/app_list/views/apps_grid_view_folder_delegate.h
index a5f1d7d36ec4050943980b5b52f8958ecdfc833c..7dfaa4cc2fd5099428b09279bb48c65fc32f2cbf 100644
--- a/ui/app_list/views/apps_grid_view_folder_delegate.h
+++ b/ui/app_list/views/apps_grid_view_folder_delegate.h
@@ -53,6 +53,10 @@ class APP_LIST_EXPORT AppsGridViewFolderDelegate {
   // Returns true if the associated folder item is an OEM folder.
   virtual bool IsOEMFolder() const = 0;
 
+  // Hides or show the root level's grid view. This is needed so that the
+  // synchronous drag has an icon for reparenting while it loads.
+  virtual void SetRootLevelDragViewVisible(bool visible) = 0;
+
  protected:
   virtual ~AppsGridViewFolderDelegate() {}
 };