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