[Bug 794793] waylandsink: change to use GCond to avoid dropping video buffer

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794793

--- Comment #5 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
(In reply to Haihua Hu from comment #0)
> waylandsink will drop video buffer when frame redraw callback didn't emit by
> wayland compositor. Change to use GCond to wait redraw callback

Ideally, instead of dropping, it should replace it. Though, probably that we
only want to do that if it's zero copy (if the memory is already SHM or
DMABuf).

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