code: public void setScheduling(com.google.api.ads.adwords.axis.v201809.cm.FeedItemScheduling scheduling) {
          this.scheduling = scheduling;
      }
docs: Sets the scheduling value for this ExtensionFeedItem.
  
  @param scheduling   * FeedItemScheduling specifying times for when the feed item
  may serve.
  On retrieval or creation of the feed item, if the
  field is left null,
  no feed item scheduling restrictions are placed on
  the feed item.
  On update, if the field is left unspecified, the previous
  feedItemScheduling state will
  not be changed.
  On update, if the field is set with a FeedItemScheduling
  with an empty feedItemSchedules
  list, the scheduling will be cleared of all FeedItemSchedules
  indicating the feed item
  has no scheduling restrictions.