Add Zone support for Timers.

tests/lib/async/catch_errors12_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 = [];
+  // Tests that errors that have been delayed by several milliseconds with
+  // Timers are still caught by `catchErrors`.
+  catchErrors(() {
+    events.add("catch error entry");
+    Timer.run(() { throw "timer error"; });
+    new Timer(const Duration(milliseconds: 100), () { throw "timer2 error"; });
+    new Future.value(499).then((x) {
+      new Timer(const Duration(milliseconds: 200), () { throw x; });
+    });
+    throw "catch error";
+  }).listen((x) {
+      events.add(x);
+    },
+    onDone: () {
+      Expect.listEquals([
+            "catch error entry",
+            "main exit",
+            "catch error",
+            "timer error",
+            "timer2 error",
+            499,
+          ],
+          events);
+      port.close();
+    });
+  events.add("main exit");
+}