constructor(value, opt_isPassphrase) {
    super();

    /**
     * The UID or passphrase to render.
     * @type {string}
     * @private
     */
    this.value_ = value;

    /**
     * If true, the chip is locked and cannot be removed or changed.
     * @type {boolean}
     * @private
     */
    this.isLocked_ = false;

    /**
     * If true, the value of this chip is a passphrase and should be masked when
     * displayed in the UI. Default is false.
     * @type {boolean}
     * @private
     */
    this.isPassphrase_ = Boolean(opt_isPassphrase);
  }
@param {string} value The UID or passphrase to render.
@param {boolean=} opt_isPassphrase If true, the provided UID is a
    passphrase and should be masked when displayed in the UI. Default is
    false.