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Original commit message from CVS:
* libs/gst/base/gstbasesink.c: (gst_base_sink_class_init),
(gst_base_sink_init), (gst_base_sink_set_property),
(gst_base_sink_get_property), (gst_base_sink_do_sync):
* libs/gst/base/gstbasesink.h:
Make max-lateness a property.