anchor.diff:      if (_infraFailure) {
         return Expectation.ignore;
       }
  -    // TODO(28955): See http://dartbug.com/28955
  -    // The code for this in _failedBecauseOfFlakyInfrastructure doesn't
  -    // seem to be working.
  -    if (hasTimedOut && testCase.configuration.runtime == Runtime.ie11) {
  -      DebugLogger.warning("Timeout of ie11 on test ${testCase.displayName}");
  -      return Expectation.ignore;
  -    }
  +
       // Handle crashes and timeouts first
       if (hasCrashed) return Expectation.crash;
       if (hasTimedOut) return Expectation.timeout;
  
positive.code:   }
  }
  
  class BrowserCommandOutputImpl extends CommandOutputImpl {
    // Although tests are reported as passing, content shell sometimes exits with
    // a nonzero exitcode which makes our dartium builders extremely falky.
    // See: http://dartbug.com/15139.
  
negative.code:     List<int> stdout, List<int> stderr, Duration time, bool compilationSkipped,
      [int pid = 0]) {
    if (command is ContentShellCommand) {
      return new ContentShellCommandOutputImpl(
          command, exitCode, timedOut, stdout, stderr, time, compilationSkipped);
    } else if (command is BrowserTestCommand) {
      return new HTMLBrowserCommandOutputImpl(
  