[Bug 709747] wayland_egl: Add support for GstVideoOverlay

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=709747
  GStreamer | gst-plugins-gl | git

--- Comment #8 from Sebastian Dröge (slomo) <slomo at coaxion.net> 2013-10-17 19:59:41 UTC ---
The sink will:
1) query upstream for a wl_display context, if no success
2) post a need-context message on the bus

The message will be answered by a bin if a bin knows a context already,
otherwise the application can answer it. If the application answer it, it works
the same way as the GstVideoOverlay interface basically.

Check eglglessink for the GstContext handling.

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