code: public void setSecondaryImageAssets(com.google.api.ads.admanager.axis.v201811.CreativeAsset[] secondaryImageAssets) {
          this.secondaryImageAssets = secondaryImageAssets;
      }
docs: Sets the secondaryImageAssets value for this ImageCreative.
  
  @param secondaryImageAssets   * The list of secondary image assets associated with this creative.
  This attribute is optional.
  
  <p>Secondary image assets can be used to store
  different resolution versions of the
  primary asset for use on non-standard density
  screens.