[Bug 750310] GL: allow an application to provide an external backend

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=750310

--- Comment #30 from Julien Isorce <julien.isorce at gmail.com> ---
I have not tested gtkglwidget since I have gtk3 < 3.15. Also I cannot test
caopengllayersink here.

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