The other function, setPropertyValues already has this variable,
so for consistency and flexibility, add it here as well. Plus, this
is prep work for another patch.

Change-Id: I16c5b1cbb9fd99a11be99a59005bd856d787a6ca
Reviewed-on: https://gerrit.libreoffice.org/54510Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Justin Luth <justin_luth@sil.org>