anchor.diff:   * Called when one of the callback functions is done with all expected
    * calls.
    */
  -void _handleCallbackFunctionComplete() {
  +void _handleCallbackFunctionComplete(testNum) {
     // TODO (gram): we defer this to give the nextBatch recursive
     // stack a chance to unwind. This is a temporary hack but
     // really a bunch of code here needs to be fixed. We have a
  
positive.code:   // which is recursively invoked in the case of async tests that
    // run synchronously. Bad things can then happen.
    _defer(() {
      if (_currentTest < _tests.length) {
        final testCase = _tests[_currentTest];
        --testCase.callbackFunctionsOutstanding;
  
negative.code:  * TODO(gram) remove this when WebKit tests are working with new framework
   */
  void callbackDone() {
    _handleCallbackFunctionComplete(_currentTest);
  }
  
  /**
  