Method setErrorSuffix_

src/utils/log.js:312–326

* @param {!Error} error * @return {!Error} * @private

(error)

   * @private
   */
  setErrorSuffix_(error) {
    error = duplicateErrorIfNecessary(error);

    if (this.suffix_) {
      if (!error.message) {
        error.message = this.suffix_;
      } else if (error.message.indexOf(this.suffix_) == -1) {
        error.message += this.suffix_;
      }
    } else if (isUserErrorMessage(error.message)) {
      error.message = stripUserError(error.message);
    }

    return error;
  }

  /**
   * @param {!Array} args