Original commit message from CVS:
* gst/audiotestsrc/gstaudiotestsrc.c:
(gst_audiotestsrc_class_init), (gst_audiotestsrc_get_times),
(gst_audiotestsrc_create):
* gst/sine/gstsinesrc.c: (gst_sinesrc_class_init),
(gst_sinesrc_get_times), (gst_sinesrc_create):
* gst/videotestsrc/gstvideotestsrc.c:
(gst_videotestsrc_class_init), (gst_videotestsrc_get_times),
(gst_videotestsrc_create):
The base class can now sync for us.