Reapply "Zone support for Futures, Timer, Streams."

tests/lib/async/catch_errors9_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';
+import 'catch_errors.dart';
+
+main() {
+  // We keep a ReceivePort open until all tests are done. This way the VM will
+  // hang if the callbacks are not invoked and the test will time out.
+  var port = new ReceivePort();
+  bool futureWasExecuted = false;
+  // Test that `catchErrors` waits for `Timer.run` before closing its error
+  // stream.
+  catchErrors(() {
+    Timer.run(() {
+      futureWasExecuted = true;
+    });
+    return 'allDone';
+  }).listen((x) {
+      Expect.fail("Unexpected callback");
+    },
+    onDone: () {
+      Expect.isTrue(futureWasExecuted);
+      port.close();
+    });
+}