code: public static JPopupMenu leftShift(JPopupMenu self, JMenuItem item) {
          self.add(item);
          return self;
      }
docs: Overloads the left shift operator to provide an easy way to add
  components to a popupMenu.<p>
  
  @param self a JPopupMenu
  @param item an item to be added to the popupMenu.
  @return same popupMenu, after the value was added to it.
  @since 1.6.4