code: public ServiceQuery nextPage(@Nullable AdGroupBidLandscapePage page) {
      if (page == null) {
        return this;
      }
      return nextPage(getTotalLandscapePointsInPage(page));
    }
docs: Sets the LIMIT clause of the AWQL to the next page calculated by using the total number of
  landscape points in {@link AdGroupBidLandscapePage}. If {@code page} is null, this will not
  change the LIMIT clause.
  
  <p>This method is meant to be used with {@code hasNext()}. The {@code page} is necessary when
  using DataService, as its paging mechanism is different from other services. For details, see
  https://developers.google.com/adwords/api/docs/guides/bid-landscapes#paging_through_results.
  
  @param page the ad group bid landscape page whose total number of landscape points will be
  used to increment the index in the LIMIT clause
  @return this service query object