setSessionId(sid) {
    if (sid) {
      this.uri_.setParameterValue(
          firebaseui.auth.ActionCodeUrlBuilder.Parameter.SESSION_ID, sid);
    } else {
      this.uri_.removeParameter(
          firebaseui.auth.ActionCodeUrlBuilder.Parameter.SESSION_ID);
    }
  }
Sets the session ID on the URL.
@param {?string} sid The session identifier.