Add second argument to Future error handlers.

tests/lib/async/zone_debug_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';
 
 import 'dart:collection';
 
@@ skipping 30 matching lines @@
 }
 
 debugZoneRunUnary(Zone self, ZoneDelegate parent, Zone origin, f(arg), arg) {
   stackTrace++;
   restoredStackTrace = [];
   return parent.run1(origin, f, arg);
 }
 
 List expectedDebugTrace;
 
-debugUncaughtHandler(Zone self, ZoneDelegate parent, Zone origin, error) {
+debugUncaughtHandler(
+    Zone self, ZoneDelegate parent, Zone origin, error, StackTrace stackTrace) {
   events.add("handling uncaught error $error");
   Expect.listEquals(expectedDebugTrace, restoredStackTrace);
   // Suppress the error and don't propagate to parent.
 }
 
 const DEBUG_SPECIFICATION = const ZoneSpecification(
     registerCallback: debugZoneRegisterCallback,
     registerUnaryCallback: debugZoneRegisterUnaryCallback,
     run: debugZoneRun,
     runUnary: debugZoneRunUnary,
@@ skipping 62 matching lines @@
   done.future.whenComplete(() {
     // We don't really care for the order.
     events.sort();
     Expect.listEquals([ "handling uncaught error bar",
                         "handling uncaught error foo",
                         "handling uncaught error gee"],
                       events);
     asyncEnd();
   });
 }