code: public void setHtml5Asset(com.google.api.ads.admanager.axis.v201811.CreativeAsset html5Asset) {
          this.html5Asset = html5Asset;
      }
docs: Sets the html5Asset value for this Html5Creative.
  
  @param html5Asset   * The HTML5 asset. To preview the HTML5 asset, use the {@link
  CreativeAsset#assetUrl}.
  In this field, the {@link CreativeAsset#assetByteArray}
  must be a zip bundle and the
  {@link CreativeAsset#fileName} must have a zip
  extension. This attribute is required.