code: function _LegacyAppBar_setFocusToAppBar(useSetActive, scroller) {
                      if (!this._focusOnFirstFocusableElement(useSetActive, scroller)) {
                          // No first element, set it to appbar itself
                          _Overlay._Overlay._trySetActive(this._element, scroller);
                      }
                  }
docs: Set focus to the passed in _LegacyAppBar