Add --build-directory option to test.py.

tools/testing/dart/test_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.
 
 #library("test_options_parser");
 
 #import("dart:io");
 #import("dart:math");
 #import("drt_updater.dart");
 #import("test_suite.dart");
@@ skipping 138 matching lines @@
               'Progress indication mode',
               ['-p', '--progress'],
               ['compact', 'color', 'line', 'verbose',
                'silent', 'status', 'buildbot'],
               'compact'),
           new _TestOptionSpecification(
               'step_name',
               'Step name for use by -pbuildbot',
               ['--step_name'],
               [],
-              'string'),
+              null),
           new _TestOptionSpecification(
               'report',
               'Print a summary report of the number of tests, by expectation',
               ['--report'],
               [],
               false,
               'bool'),
           new _TestOptionSpecification(
               'tasks',
               'The number of parallel tasks to run',
@@ skipping 80 matching lines @@
 
 Normally, the compiler or runtimes in PRODUCT_DIR is tested, with this
 option, the compiler or runtime in PRODUCT_DIR/dart-sdk/bin is tested.
 
 Note: currently only implemented for dart2js.''',
               ['--use-sdk'],
               [],
               false,
               'bool'),
           new _TestOptionSpecification(
+              'build_directory',
+              'The name of the build directory, where products are placed.',
+              ['--build-directory'],
+              [],
+              ''),
+          new _TestOptionSpecification(
               'noBatch',
               'Do not run browser tests in batch mode',
               ['-n', '--nobatch'],
               [],
               false,
               'bool'),
           new _TestOptionSpecification(
               'append_flaky_log',
               'Do not delete the old flaky log but rather append to it.',
               ['--append_flaky_log'],
@@ skipping 393 matching lines @@
         return option;
       }
     }
     print('Unknown test option $name');
     exit(1);
   }
 
 
   List<_TestOptionSpecification> _options;
 }