Add a basic YAML processor. Much of the language is still unimplemented.

tools/test.dart

 #!/usr/bin/env 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.
 
 /**
  * This file is the entrypoint of the dart test suite.  This suite is used
  * to test:
  *
  *     1. the dart vm
@@ skipping 38 matching lines @@
 #import("../utils/tests/import_mapper/test_config.dart");
 #import("../utils/tests/peg/test_config.dart");
 
 /**
  * The directories that contain test suites which follow the conventions
  * required by [DirectoryTestSuite]. Ideally, we'd move more suites to this
  * convention because it makes it much simpler to add them to test.dart. (You
  * basically add the directory here and you're done.)
 */
 final TEST_SUITE_DIRECTORIES = const [
-  'utils/tests/pub'
+  'utils/tests/pub',
 ];
 
 main() {
   var startTime = new Date.now();
   var optionsParser = new TestOptionsParser();
   List<Map> configurations = optionsParser.parse(new Options().arguments);
   if (configurations == null || configurations.length == 0) return;
 
   // Extract global options from first configuration.
   var firstConf = configurations[0];
@@ skipping 99 matching lines @@
   // Start process queue.
   var queue = new ProcessQueue(maxProcesses,
                                progressIndicator,
                                startTime,
                                printTiming,
                                enqueueConfiguration,
                                verbose,
                                listTests,
                                keepGeneratedTests);
 }