[Bug 789094] omx: add test support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789094

--- Comment #1 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 361738
  --> https://bugzilla.gnome.org/attachment.cgi?id=361738&action=edit
add test support

Most of the boilerplate and the states test has been copied from
gst-plugins-good.

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