35e2ecd48b
When ClockSync synchronizes the data stream on the clock, it should also push `QoS` events if the user wants to do it as, as stated in [the QoS design doc] "Elements that synchronize buffers on the pipeline clock will usually measure the current QoS". The logic has been replicated from `GstBaseSink`. [the QoS design doc]: https://gstreamer.freedesktop.org/documentation/plugin-development/advanced/qos.html Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2225>