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/**
     * Translate the page contents.  Note that the translation is asynchronous.
     * You need to regularly check the state of |finished| and |errorCode| to
     * know if the translation finished or if there was an error.
     * @param {string} sourceLang The language the page is in.
     * @param {string} targetLang The language the page should be translated to.
     * @return {boolean} False if the translate library was not ready, in which
     *                   case the translation is not started.  True otherwise.
     */
    translate(sourceLang, targetLang) {
      finished = false;
      errorCode = ERROR['NONE'];
      if (!libReady) {
        return false;
      }
      startTime = performance.now();
      try {
        lib.translatePage(sourceLang, targetLang, onTranslateProgress);
      } catch (err) {
        console.error('Translate: ' + err);
        errorCode = ERROR['UNEXPECTED_SCRIPT_ERROR'];
        invokeResultCallback();
        return false;
      }
      return true;
    },

    /**
     * Reverts the page contents to its original value, effectively reverting
     * any performed translation.  Does nothing if the page was not translated.
     */
    revert() {
      lib.restore();
    },