Add builder_tag option to tools/test.dart

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";
 
@@ skipping 366 matching lines @@
               [],
               null),
           new _TestOptionSpecification(
               'replay_from_file',
               'Records all the commands that need to be executed and writes it '
               'out to a file.',
               ['--replay_from_file'],
               [],
               null),
           new _TestOptionSpecification(
+              'test_tag',
+              'Machine specific options that is not captured by the regular '
+              'test options. Used to be able to make sane updates to the '
+              'status files.',
+              ['--test-tag'],
+              [],
+              null),
+          new _TestOptionSpecification(
               'vm_options',
               'Extra options to send to the vm when running',
               ['--vm-options'],
               [],
               null),];
   }
 
 
   /**
    * Parse a list of strings as test options.
@@ skipping 424 matching lines @@
         return option;
       }
     }
     print('Unknown test option $name');
     exit(1);
   }
 
 
   List<_TestOptionSpecification> _options;
 }