[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

Matthew Waters <ystreet00> changed:

           What    |Removed                     |Added
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 Attachment #264957|0                           |1
        is obsolete|                            |

--- Comment #33 from Matthew Waters <ystreet00 at gmail.com> 2013-12-28 13:13:33 UTC ---
Created an attachment (id=264958)
 View: https://bugzilla.gnome.org/attachment.cgi?id=264958
 Review: https://bugzilla.gnome.org/review?bug=704321&attachment=264958

use GstContext for GstGLDisplay propogation

Also, fail in the context query response if display is NULL

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