anchor.diff:      var status = new BrowserTestingStatus(browser);
       browserStatus[new_id] = status;
       status.nextTestTimeout = createNextTestTimer(status);
  +    status.timeSinceRestart.start();
       browser.start(testingServer.getDriverUrl(new_id)).then((success) {
         // We may have started terminating in the mean time.
         if (underTermination) {
  
positive.code: class BrowserTestRunner {
    static const int MAX_NEXT_TEST_TIMEOUTS = 10;
    static const Duration NEXT_TEST_TIMEOUT = const Duration(seconds: 60);
  
    final Map globalConfiguration;
    final bool checkedMode; // needed for dartium
  
negative.code: 
      // We are currently terminating this browser, don't start a new test.
      if (status.timeout) return null;
  
      // Restart content_shell and dartium on Android if they have been
      // running for longer than RESTART_BROWSER_INTERVAL. The tests have
      // had flaky timeouts, and this may help.
      if ((browserName == 'ContentShellOnAndroid' ||
           browserName == 'DartiumOnAndroid' ) &&
          status.timeSinceRestart.elapsed > RESTART_BROWSER_INTERVAL) {
        var id = status.browser.id;
        status.browser.close().then((_) {
          // We don't want to start a new browser if we are terminating.
          if (underTermination) return;
          restartBrowser(id);
        });
        // Don't send a test to the browser we are restarting.
        return null;
      }
  
      BrowserTest test = testQueue.removeLast();
      if (status.currentTest == null) {
  