Updated testrunner:

utils/testrunner/layout_test_runner.dart

Index: utils/testrunner/layout_test_runner.dart
===================================================================
--- utils/testrunner/layout_test_runner.dart	(revision 21957)
+++ utils/testrunner/layout_test_runner.dart	(working copy)
@@ -2,15 +2,18 @@
 // 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.
 
+part of layout_test;
+
 // The filters must be set by the caller that #sources this file.
 List includeFilters;
+List excludeFilters;
 
-// TODO(gram): dart2js is not handling 'part of' properly yet; when it
-// does uncomment this.
-//part of layout_test;
+/**
+ * A special marker string used to separate group names and
+ * identify non-debug output.
+ */ 
+final marker = '###';
 
-List excludeFilters;
-
 class LayoutTestConfiguration extends unittest.Configuration {
   get autoStart => false;
   void onTestResult(unittest.TestCase testCase) {
@@ -19,7 +22,7 @@
 }
 
 filterTest(t) {
-  var name = t.description.replaceAll("###", " ");
+  var name = t.description.replaceAll(marker, " ");
   if (includeFilters.length > 0) {
     for (var f in includeFilters) {
       if (name.indexOf(f) >= 0) return true;
@@ -36,8 +39,8 @@
 }
 
 runTests(testMain) {
-  unittest.groupSep = '###';
-  unittest.configure(new LayoutTestConfiguration());
+  unittest.groupSep = marker;
+  unittest.unittestConfiguration = new LayoutTestConfiguration();
 
   // Create the set of test cases.
   unittest.group('', testMain);