[Bug 704808] Split GstGLDisplay into that and GstGLContext

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=704808
  GStreamer | gst-plugins-gl | git

--- Comment #14 from Matthew Waters <ystreet00 at gmail.com> 2013-08-22 06:10:48 UTC ---
(In reply to comment #13)
> Alright, let's get this shipped then :) Would you like me to merge that now
> from your branch or wait until the next, quite related part is done?

It should be good to go now.  I fixed up the compilation of tests and
refcounting between window and context so we can swap out window's from
contexts (before creation).  That should help with offscreen vs onscreen
windows later on down the track.  It's all very related to the concept of 'give
me a GL context';).

In the end, the only thing that has changed from an element's POV is that it
now has to create a GstGLContext and set that on GstGLDisplay.  All of the
previous restrictions are still there.

P.S. There's a race in context creation but that was there before this patch
anyway.

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