addEventListener('iron-ajax-presend', incrementTotal);
          window.addEventListener('request', incrementTotal);
          window.addEventListener('iron-ajax-request', incrementTotal);
          // NOTE(cdata): This needs to be capturing because Mocha + Firefox
          // results in the error event being observed too early by the test
          // runner and failing the test:
          window.addEventListener('error', incrementTotal, true);
          window.addEventListener('iron-ajax-error', incremen