Add Zone support for Timers.

tests/lib/async/catch_errors5_test.dart

Index: tests/lib/async/catch_errors5_test.dart
diff --git a/tests/lib/async/catch_errors5_test.dart b/tests/lib/async/catch_errors5_test.dart
index 7fea08f0cfdfa33b7e30a01f1f025b569f43c8a1..a6c70db40a3835d6ef66b38f8e325a6fedce7243 100644
--- a/tests/lib/async/catch_errors5_test.dart
+++ b/tests/lib/async/catch_errors5_test.dart
@@ -8,7 +8,7 @@ import 'dart:isolate';
 
 main() {
   // We keep a ReceivePort open until all tests are done. This way the VM will
-  // time out if the callbacks are not invoked.
+  // hang if the callbacks are not invoked and the test will time out.
   var port = new ReceivePort();
   var events = [];
   // Test that synchronous *and* asynchronous errors are caught by
@@ -21,8 +21,7 @@ main() {
       events.add(x);
     },
     onDone: () {
-      Expect.listEquals([
-                         "catch error entry",
+      Expect.listEquals(["catch error entry",
                          "main exit",
                          "catch error",
                          "future error",