[Bug 740557] videotestsrc: add ball motion based on system clock

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=740557
  GStreamer | gst-plugins-base | git

--- Comment #25 from Luis de Bethencourt <luis at debethencourt.com> 2015-01-08 17:12:56 UTC ---
Thanks for the review Sebastian! :)

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