The Download_As is emitted when the user chooses 'Print' or 'Show
slideshow' or 'Download As [some type'] and the integration indicates
via DownloadAsPostMessage in the CheckFileInfo that it wants to handle
the downloading of pdf for printing or svg for slideshows or experted
document.
This is particularly useful in situations when the integration cannot
rely on browser's support for downloading like in mobile apps that use
the Online in a WebView.
Change-Id: Iefdf214937c0c0dafd7462340a1c5e88df94e716
Reviewed-on: https://gerrit.libreoffice.org/73449
Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>