Introduce the legium component in test.dart, and start support for dart:dom and dart:html.

tools/testing/dart/test_options.dart

 // Copyright (c) 2011, 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");
 
 List<String> defaultTestSelectors =
     const ['dartc', 'samples', 'standalone', 'corelib', 'co19', 'language',
@@ skipping 46 matching lines @@
               'mode',
               'Mode in which to run the tests',
               ['-m', '--mode'],
               ['all', 'debug', 'release'],
               'debug'),
           new _TestOptionSpecification(
               'component',
               'The component to test against',
               ['-c', '--component'],
               ['most', 'vm', 'dartc', 'frog', 'frogsh', 'leg',
-               'dartium', 'chromium', 'frogium', 'webdriver'],
+               'dartium', 'chromium', 'frogium', 'legium', 'webdriver'],
               'vm'),
           new _TestOptionSpecification(
               'arch',
               'The architecture to run tests for',
               ['-a', '--arch'],
               ['all', 'ia32', 'x64', 'simarm'],
               'ia32'),
           new _TestOptionSpecification(
               'system',
               'The operating system to run tests on',
@@ skipping 341 matching lines @@
     }
 
     // Adjust default timeout based on mode and component.
     if (configuration['timeout'] == -1) {
       var timeout = 60;
       switch (configuration['component']) {
         case 'dartc':
         case 'chromium':
         case 'dartium':
         case 'frogium':
+        case 'legium':
         case 'webdriver':
           timeout *= 4;
           break;
         case 'leg':
         case 'frog':
           if (configuration['mode'] == 'debug') {
             timeout *= 4;
           }
           break;
         default:
@@ skipping 56 matching lines @@
         return option;
       }
     }
     print('Unknown test option $name');
     exit(1);
   }
 
 
   List<_TestOptionSpecification> _options;
 }