This paves the way to add pdf
parsing via pdfium.

Change-Id: I384687bcdce3011682ebeec18ee3de44759feb1a
Reviewed-on: https://gerrit.libreoffice.org/51254Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Reviewed-on: https://gerrit.libreoffice.org/69620Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>