code: public void setPrimaryImageAsset(com.google.api.ads.admanager.axis.v201805.CreativeAsset primaryImageAsset) {
          this.primaryImageAsset = primaryImageAsset;
      }
docs: Sets the primaryImageAsset value for this BaseImageCreative.
  
  @param primaryImageAsset   * The primary image asset associated with this creative. This
  attribute is required.