Add browser controller and allow it to be used under a flag.

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 "dart:math";
 import "drt_updater.dart";
 import "test_suite.dart";
@@ skipping 283 matching lines @@
               false,
               'bool'
               ),
           new _TestOptionSpecification(
               'write_debug_log',
               'Don\'t write debug messages to stdout but rather to a logfile.',
               ['--write-debug-log'],
               [],
               false,
               'bool'
+              ),
+          new _TestOptionSpecification(
+              'use_browser_controller',
+              'Use the new selenium replacement browser-controller.',
+              ['--use_browser_controller'],
+              [],
+              false,
+              'bool'
               ),];
   }
 
 
   /**
    * Parse a list of strings as test options.
    *
    * Returns a list of configurations in which to run the
    * tests. Configurations are maps mapping from option keys to
    * values. When encountering the first non-option string, the rest
@@ skipping 378 matching lines @@
         return option;
       }
     }
     print('Unknown test option $name');
     exit(1);
   }
 
 
   List<_TestOptionSpecification> _options;
 }