So that it's possible to assert the layout from cppunit tests.

Change-Id: I09631f978ed44bb1c27806089b6d69c70db643c3
Reviewed-on: https://gerrit.libreoffice.org/26054Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>