Add dart2js batch mode support

tools/testing/dart/test_options.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test_options_parser;
 
 import "dart:io";
 import "drt_updater.dart";
 import "test_suite.dart";
 import "compiler_configuration.dart" show CompilerConfiguration;
@@ skipping 282 matching lines @@
               false,
               type: 'bool'),
           new _TestOptionSpecification(
               'build_directory',
               'The name of the build directory, where products are placed.',
               ['--build-directory'],
               [],
               ''),
           new _TestOptionSpecification(
               'noBatch',
-              'Do not run browser tests in batch mode',
+              'Do not run tests in batch mode',
               ['-n', '--nobatch'],
               [],
               false,
               type: 'bool'),
           new _TestOptionSpecification(
+              'dart2js_batch',
+              'Run dart2js tests in batch mode',
+              ['--dart2js-batch'],
+              [],
+              false,
+              type: 'bool'),
+          new _TestOptionSpecification(
               'append_logs',
               'Do not delete old logs but rather append to them.',
               ['--append_logs'],
               [],
               false,
               type: 'bool'),
           new _TestOptionSpecification(
               'write_debug_log',
               'Don\'t write debug messages to stdout but rather to a logfile.',
               ['--write-debug-log'],
@@ skipping 521 matching lines @@
         return option;
       }
     }
     print('Unknown test option $name');
     exit(1);
   }
 
 
   List<_TestOptionSpecification> _options;
 }