Optional.
Called just prior to pushing a frame (after any pending
events have been sent) to give subclass a chance to perform
additional actions at this time (e.g. tag sending) or to
decide whether this buffer should be dropped or not
(e.g. custom segment clipping).
Optional. Called just prior to pushing a frame (after any pending events have been sent) to give subclass a chance to perform additional actions at this time (e.g. tag sending) or to decide whether this buffer should be dropped or not (e.g. custom segment clipping).