docs: function pollForParentOpen() {
    /* jshint validthis:true */
    if (this.pollNum > 0) {
      if (this.opener && !this.opener.OLD_TUNGSTEN_MASTER && typeof this.opener.attachTungstenDebugPane === 'function') {
        this.opener.attachTungstenDebugPane(this);
      } else {
        this.pollNum -= 1;
        this.loadingCounter.textContent = '' + this.pollNum;
        this.setTimeout(pollForParentOpen, POLL_INTERVAL);
      }
    } else {
      this.window.close();
    }
  }