def record_change_entry(self, changedesc, old_value, new_value):
        changedesc.record_field_change(self.field_id, old_value, new_value)
This method will be called for each new file successfully fetched.
dataset/ETHPy150Open reviewboard/reviewboard/reviewboard/reviews/fields.py/BaseReviewRequestField.record_change_entry--crossover with--dataset/ETHPy150Open google/grr/grr/lib/flows/general/transfer.py/MultiGetFileMixin.ReceiveFetchedFile