Zone support for Futures.

tests/lib/async/catch_errors4_test.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.
+
+import "package:expect/expect.dart";
+import 'dart:async';
+import 'dart:isolate';
+
+main() {
+  var port = new ReceivePort();
+  var events = [];
+  catchErrors(() {
+    events.add("catch error entry");
+    throw "catch error";
+  }).listen((x) {
+      events.add(x);
+    },
+    onDone: () {
+      Expect.listEquals([
+                         "catch error entry",
+                         "main exit",
+                         "catch error",
+                         ],
+                         events);
+      port.close();
+    });
+  events.add("main exit");
+}