anchor.diff:      } else {
         var browsers = [];
         for (int i = 0; i < maxNumBrowsers; i++) {
  -        var id = "BROWSER$i";
  +        var id = "BROWSER$browserIdCount";
  +        browserIdCount++;
           var browser = getInstance();
           browsers.add(browser);
           // We store this in case we need to kill the browser.
  
positive.code: 
    void handleResults(String browserId, String output, int testId) {
      var status = browserStatus[browserId];
      if (testCache.containsKey(testId)) {
        doubleReportingTests.add(testId);
        return;
  
negative.code:           return;
          }
          if (success) {
            browserStatus[browser.id] = new BrowserTestingStatus(browser);
          } else {
            // TODO(ricow): Handle this better.
            print("This is bad, should never happen, could not start browser");
  