If they exist for tools::Point, I don't see why they couldn't
do the same also for Size.
Change-Id: I02ca1bb413b0bd2694a904372e9a18a7a50be17b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/113725
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>