anchor.diff:      String command = await _makePathAbsolute(path.join(results['mojo-path'], 'mojo', 'devtools', 'common', 'mojo_run'));
       String appName = path.basename(appPath);
       String appDir = path.dirname(appPath);
  +    String buildFlag = argResults['mojo-debug'] ? '--debug' : '--release';
       List<String> args = [
         '--android',
  -      '--release',
  +      buildFlag,
         'http://app/$appName',
         '--map-origin=http://app/=$appDir',
         '--map-origin=http://sky_viewer/=$skyViewerUrl',
  
positive.code: 
    Future<int> _runLinux(ArgResults results, String appPath, ArtifactStore artifacts) async {
      String viewerPath = await _makePathAbsolute(await artifacts.getPath(Artifact.SkyViewerMojo));
      String mojoShellPath = await _makePathAbsolute(path.join(results['mojo-path'], 'out', 'Release', 'mojo_shell'));
      List<String> args = [
        'file://${appPath}',
        '--url-mappings=mojo:sky_viewer=file://${viewerPath}'
  
negative.code:       _logging.severe('Must specify --mojo-path to mojo_run');
        return 1;
      }
      if (argResults['mojo-debug'] && argResults['mojo-release']) {
        _logging.severe('Cannot specify both --mojo-debug and --mojo-release');
        return 1;
      }
      String packageRoot = argResults['package-root'];
      ArtifactStore artifacts = new ArtifactStore(packageRoot);
      String appPath = await _makePathAbsolute(argResults['app']);
  