[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

Bug 704321 depends on bug 704808, which changed state.

Bug 704808 Summary: Split GstGLDisplay into that and GstGLContext
https://bugzilla.gnome.org/show_bug.cgi?id=704808

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

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