code: func (gce *Cloud) ListGlobalForwardingRules() (*compute.ForwardingRuleList, error) {
  	// TODO: use PageToken to list all not just the first 500
  	return gce.service.GlobalForwardingRules.List(gce.projectID).Do()
  }
docs: // ListGlobalForwardingRules lists all GlobalForwardingRules in the project.