Added the ability for testrunner to start the HTTP server with a random port and communicate that p…

utils/testrunner/options.dart

 // Copyright (c) 2012, 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.
 
 part of testrunner;
 
 /** Create and return an options parser for the test runner. */
 ArgParser getOptionParser() {
   var parser = new ArgParser();
 
@@ skipping 124 matching lines @@
         'file. Note that in some async cases this may result in multiple '
         'messages for a single test.',
       defaultsTo: false);
 
   parser.addFlag('regenerate',
       help: 'Regenerate layout test expectation files.',
       defaultsTo: false);
 
   parser.addFlag('server', help: 'Run an HTTP server.', defaultsTo: false);
 
-  parser.addOption('port', help: 'Port to use for HTTP server',
-      defaultsTo: '8080');
+  parser.addOption('port', help: 'Port to use for HTTP server');
 
   parser.addOption('root',
       help: 'Root directory for HTTP server for static files');
 
   parser.addOption('unittest',  help: '#import path for unit test library.');
 
   parser.addOption('pipeline',
       help: 'Pipeline script to use to run each test file.',
       defaultsTo: 'run_pipeline.dart');
 
@@ skipping 100 matching lines @@
     print('--include and --exclude are mutually exclusive.');
     return false;
   }
   if ((config['layout-text'] || config['layout-pixel']) &&
       config['runtime'] == 'vm') {
     print('Layout tests must use --runtime values of "drt-dart" or "drt-js"');
     return false;
   }
   return true;
 }