[Bug 774649] glupload: expose memory:DMABuf capsfeature

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774649

--- Comment #3 from Julien Isorce <julien.isorce at gmail.com> ---
When the dmabuf is mappable the user does not want the gst elements to work in
pass-through mode (and these elements do not want to have conscience this is
dmabuf) in between the export element (upstream elem) and the importer element
(downstream elem).

Having it after systemMem tells the exporter to follow the rule above. If we
put it after then it will not let the exporter the chance to push the dma
buffers without the caps feature.

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