anchor.diff:          _batchProcesses = new List<DartcBatchRunnerProcess>(),
           _testCache = new Map<String, List<TestInformation>>() {
       if (!_enqueueMoreWork(this)) _progress.allDone();
  +    browserUsed = '';
     }
   
     /**
  
positive.code:   }
  
    void _runTest(TestCase test) {
      _progress.testAdded();
      _tests.add(test);
      _tryRunTest();
  
negative.code:           '$compilerPath ${Strings.join(compilerArguments, " ")}';
        commandLine = 'compilation command: $compilationCommand\n$commandLine';
      }
      numRetries = 2; // Allow two retries to compensate for flaky browser tests.
    }
  }
  
  