code: function sendMessage(command, opt_value, opt_transfer) {
      // TODO(benvanik): attempt to use webkitPostMessage
      originalPostMessage.call(goog.global, {
        '__wtf_worker_msg__': true,
        'command': command,
        'value': opt_value || null
      }, []);
    }
docs: Sends an internal message to the worker.
  @param {string} command Command name.
  @param {*=} opt_value Command value.
  @param {Array=} opt_transfer Transferrable values.