Ensure that errors have stack traces attached.

sdk/lib/_internal/pub/lib/src/safe_http_server.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.
 
 library pub.safe_http_server;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
@@ skipping 136 matching lines @@
   HttpConnectionInfo get connectionInfo => _inner.connectionInfo;
   void add(List<int> data) => _inner.add(data);
   Future<HttpResponse> addStream(Stream<List<int>> stream) =>
     _inner.addStream(stream);
   Future close() => _inner.close();
   void write(Object obj) => _inner.write(obj);
   void writeAll(Iterable objects, [String separator = ""]) =>
     _inner.writeAll(objects, separator);
   void writeCharCode(int charCode) => _inner.writeCharCode(charCode);
   void writeln([Object obj = ""]) => _inner.writeln(obj);
-  void addError(error) => _inner.addError(error);
+  void addError(error, [StackTrace stackTrace]) =>
+      _inner.addError(error, stackTrace);
 
   Duration get deadline => _inner.deadline;
   set deadline(Duration value) {
     _inner.deadline = value;
   }
 
   Future redirect(Uri location, {int status: HttpStatus.MOVED_TEMPORARILY}) =>
       _inner.redirect(location, status: status);
 }