anchor.diff:      String bundlePath,
       bool enableObservatory: false,
       bool startPaused: false,
  +    bool strongMode: false,
       int observatoryPort,
     }) {
       assert(executable != null); // Please provide the path to the shell in the SKY_SHELL environment variable.
  
positive.code:         packages: PackageMap.globalPackagesPath,
          enableObservatory: enableObservatory,
          startPaused: startPaused,
          observatoryPort: explicitObservatoryPort,
          bundlePath: bundlePath,
        );
        subprocessActive = true;
        finalizers.add(() async {
  
negative.code:       command.add('--ipv6');
      if (bundlePath != null) {
        command.add('--flutter-assets-dir=$bundlePath');
      }
      if (strongMode) {
        command.add('--strong');
      }
      command.addAll(<String>[
        '--enable-dart-profiling',
  