code: public com.google.api.ads.admanager.axis.v201805.CompanionDeliveryOption getBuiltInCompanionDeliveryOption() {
          return builtInCompanionDeliveryOption;
      }
docs: Gets the builtInCompanionDeliveryOption value for this ProposalLineItemConstraints.
  
  @return builtInCompanionDeliveryOption   * The built-in companion delivery option for the created {@link
  ProposalLineItem}.
  
  <p>This attribute is read-only.