Builds pagination-aware request object.

        More details:
          https://developers.google.com/api-client-library/python/guide/pagination

        Args:
            verb (str): Request verb (ex. insert, update, delete).
            prior_request (httplib2.HttpRequest): Request that may trigger
                paging.
            prior_response (dict): Potentially partial response.

        Returns:
            httplib2.HttpRequest: HttpRequest or None. None is returned when
                there is nothing more to fetch - request completed.

def _build_next_request(self, verb, prior_request, prior_response):
        """Builds pagination-aware request object.

        More details:
          https://developers.google.com/api-client-library/python/guide/pagination

        Args:
            verb (str): Request verb (ex. insert, update, delete).
            prior_request (httplib2.HttpRequest): Request that may trigger
                paging.
            prior_response (dict): Potentially partial response.

        Returns:
            httplib2.HttpRequest: HttpRequest or None. None is returned when
                there is nothing more to fetch - request completed.
        """
        method = getattr(self._component, verb + '_next')
        return method(prior_request, prior_response)