Add mode to test.dart to run dart2js with kernel, and include initial set of

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 "path.dart";
@@ skipping 195 matching lines @@
           [],
           false,
           type: 'bool'),
       new _TestOptionSpecification(
           'fast_startup',
           'Pass the --fast-startup flag to dart2js',
           ['--fast-startup'],
           [],
           false,
           type: 'bool'),
+      new _TestOptionSpecification(
+          'dart2js_with_kernel',
+          'Enable the internal pipeline in dart2js to use kernel',
+          ['--dart2js-with-kernel'],
+          [],
+          false,
+          type: 'bool'),
       new _TestOptionSpecification('hot_reload', 'Run hot reload stress tests',
           ['--hot-reload'], [], false,
           type: 'bool'),
       new _TestOptionSpecification(
           'hot_reload_rollback',
           'Run hot reload rollback stress tests',
           ['--hot-reload-rollback'],
           [],
           false,
           type: 'bool'),
@@ skipping 773 matching lines @@
         return option;
       }
     }
     print('Unknown test option $name');
     exit(1);
     return null; // Unreachable.
   }
 
   List<_TestOptionSpecification> _options;
 }