Update of co19_test.dart to reflect new API

tools/test.dart

 #!/usr/bin/env 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.
 
 /**
  * This file is the entrypoint of the dart test suite.  This suite is used
  * to test:
  *
  *     1. the dart vm
@@ skipping 53 matching lines @@
     new Path('tests/language'),
     new Path('tests/lib'),
     new Path('tests/standalone'),
     new Path('tests/utils'),
     new Path('utils/tests/css'),
     new Path('utils/tests/peg'),
     new Path('utils/tests/pub'),
     new Path('sdk/lib/_internal/dartdoc'),
 ];
 
-main() {
+void testConfigurations(List<Map> configurations) {
   var startTime = new DateTime.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];
   Map<String, RegExp> selectors = firstConf['selectors'];
   var maxProcesses = firstConf['tasks'];
   var progressIndicator = firstConf['progress'];
   BuildbotProgressIndicator.stepName = firstConf['step_name'];
   var verbose = firstConf['verbose'];
   var printTiming = firstConf['time'];
   var listTests = firstConf['list'];
   var useContentSecurityPolicy = firstConf['csp'];
@@ skipping 130 matching lines @@
                      listTests);
   }
 
   // Start all the HTTP servers required before starting the process queue.
   if (serverFutures.isEmpty) {
     startProcessQueue();
   } else {
     Future.wait(serverFutures).then((_) => startProcessQueue());
   }
 }
+
+void main() {
+  var optionsParser = new TestOptionsParser();
+  var configurations = optionsParser.parse(new Options().arguments);
+  if (configurations != null || configurations.length > 0) {
+    testConfigurations(configurations);
+  }
+}
+