Add second argument to Future error handlers.

tests/lib/async/zone_run_guarded_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 'package:async_helper/async_helper.dart';
 import 'dart:async';
 
 main() {
   Completer done = new Completer();
   List events = [];
 
   // runGuarded calls run, captures the synchronous error (if any) and
   // gives that one to handleUncaughtError.
 
   Expect.identical(Zone.ROOT, Zone.current);
   Zone forked;
   forked = Zone.current.fork(specification: new ZoneSpecification(
       run: (Zone self, ZoneDelegate parent, Zone origin, f()) {
         // The zone is still the same as when origin.run was invoked, which
         // is the root zone. (The origin zone hasn't been set yet).
         Expect.identical(Zone.ROOT, Zone.current);
         events.add("forked.run");
         return parent.run(origin, f);
       },
-      handleUncaughtError: (Zone self, ZoneDelegate parent, Zone origin, e) {
+      handleUncaughtError:
+          (Zone self, ZoneDelegate parent, Zone origin, error, stackTrace) {
         Expect.identical(Zone.ROOT, Zone.current);
         Expect.identical(forked, origin);
-        events.add("forked.handleUncaught $e");
+        events.add("forked.handleUncaught $error");
         return 499;
       }));
 
   var result = forked.runGuarded(() {
     events.add("runGuarded 1");
     Expect.identical(forked, Zone.current);
     return 42;
   });
   Expect.identical(Zone.ROOT, Zone.current);
   Expect.equals(42, result);
@@ skipping 29 matching lines @@
 
   done.future.whenComplete(() {
     Expect.listEquals(
         ["forked.run", "run closure", "forked.handleUncaught 1234",
          "after nested runAsync", "forked.run", "run closure 2",
          "forked.handleUncaught 88" ],
         events);
     asyncEnd();
   });
 }