code: public void setBumper(com.google.api.ads.admanager.axis.v201805.AdRuleSlotBumper bumper) {
          this.bumper = bumper;
      }
docs: Sets the bumper value for this BaseAdRuleSlot.
  
  @param bumper   * The {@link AdRuleSlotBumper} for this slot. This attribute
  is optional and
  defaults to {@link AdRuleSlotBumper#NONE}.