code: public com.google.api.ads.admanager.axis.v201902.SmartSizeMode getSmartSizeMode() {
          return smartSizeMode;
      }
docs: Gets the smartSizeMode value for this AdUnit.
  
  @return smartSizeMode   * The smart size mode for this ad unit. This attribute is optional
  and defaults to {@link
  SmartSizeMode#NONE} for fixed sizes.