[Bug 776894] Add fallback function to switch track in playbin3

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=776894

--- Comment #1 from HoonHee Lee <hoonh83.lee at gmail.com> ---
Created attachment 342934
  --> https://bugzilla.gnome.org/attachment.cgi?id=342934&action=edit
gst-play: add fallback function to switch track in playbin3

Please check my patch and feedback me.

Thanks.

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