Add Zone support for Timers.

tests/lib/async/catch_errors14_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() {
+  // We keep a ReceivePort open until all tests are done. This way the VM will
+  // time out if the callbacks are not invoked.
+  var port = new ReceivePort();
+  var events = [];
+  // Test that periodic Timers are handled correctly by `catchErrors`.
+  catchErrors(() {
+    int counter = 0;
+    new Timer.periodic(const Duration(milliseconds: 50), (timer) {
+      if (counter++ == 5) timer.cancel();
+      throw "error $counter";
+    });
+  }).listen((x) {
+      events.add(x);
+    },
+    onDone: () {
+      Expect.listEquals([
+                         "main exit",
+                         "error 1",
+                         "error 2",
+                         "error 3",
+                         "error 4",
+                         "error 5",
+                         "error 6",
+                         ],
+                         events);
+      port.close();
+    });
+  events.add("main exit");
+}