[Bug 704321] Add complete support for GstContext

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=704321
  GStreamer | gst-plugins-gl | git

--- Comment #27 from Matthew Waters <ystreet00 at gmail.com> 2013-11-14 04:30:33 UTC ---
Created an attachment (id=259779)
 View: https://bugzilla.gnome.org/attachment.cgi?id=259779
 Review: https://bugzilla.gnome.org/review?bug=704321&attachment=259779

fail in context query if display is NULL

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