[Bug 786800] harness: add support for pushing BufferList

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=786800

--- Comment #7 from Miguel París Díaz <mparisdiaz at gmail.com> ---
OK, I see.
So, what do you think about iterating the buffers in the list in reverse order
and get the timestamp from the first one which has a valid PTS?

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