Add missing import to tools/test-runtime.dart

tools/test-runtime.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.
 
 // TODO(ager): Get rid of this version of test.dart when we don't have
 // to worry about the special runtime checkout anymore.
 // This file is identical to test.dart with test suites in the
 // directories samples, client, compiler, and utils removed.
 
 #library("test");
 
 #import("dart:io");
 #import("testing/dart/test_runner.dart");
 #import("testing/dart/test_options.dart");
 #import("testing/dart/test_suite.dart");
 #import("testing/dart/http_server.dart");
+#import("testing/dart/utils.dart");
 
 #import("../tests/co19/test_config.dart");
 #import("../runtime/tests/vm/test_config.dart");
 
 /**
  * The directories that contain test suites which follow the conventions
  * required by [StandardTestSuite]'s forDirectory constructor.
  * New test suites should follow this convention because it makes it much
  * simpler to add them to test.dart.  Existing test suites should be
  * moved to here, if possible.
@@ skipping 96 matching lines @@
       maxProcesses,
       maxBrowserProcesses,
       progressIndicator,
       startTime,
       printTiming,
       testSuites,
       allTestsFinished,
       verbose,
       listTests);
 }