[Bug 751104] make Gtk sinks usable from gst-launch

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751104

--- Comment #4 from Xavier Claessens <xclaesse at gmail.com> ---
Created attachment 305477
  --> https://bugzilla.gnome.org/attachment.cgi?id=305477&action=edit
GstGtkGLSink: Ensure widget has a toplevel parent

Checking for a parent is not enough, it must have a toplevel one.
If widget has no toplevel parent then add it in a GtkWindow, that
make it usable from gst-launch-1.0.

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