code: function addToWorkingSet(file, index, forceRedraw) {
          DeprecationWarning.deprecationWarning("Use MainViewManager.addToWorkingSet() instead of DocumentManager.addToWorkingSet()", true);
          MainViewManager.addToWorkingSet(MainViewManager.ACTIVE_PANE, file, index, forceRedraw);
      }
docs: Adds the given file to the end of the working set list.
  @deprecated Use MainViewManager.addToWorkingSet() instead
  @param {!File} file
  @param {number=} index  Position to add to list (defaults to last); -1 is ignored
  @param {boolean=} forceRedraw  If true, a working set change notification is always sent
  (useful if suppressRedraw was used with removeFromWorkingSet() earlier)