[Bug 786800] harness: add support for pushing BufferList

[GStreamer (GNOME Bugzilla)]

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

--- Comment #2 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
> Fix getting the PTS of the last buffer in the list to assign last_push_ts.

This is not really right.

Typically a buffer list will have one timestamp, and that's on the first
buffer.

Of course it might contain buffers with multiple timestamps, so you could do
your check but there should always be a fallback to the first buffer imho.

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