Add stack chain support to pkg/watcher and pkg/http.

pkg/http/lib/src/utils.dart

 // Copyright (c) 2012, 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 utils;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 import 'dart:typed_data';
 
+import 'package:stack_trace/stack_trace.dart';
+
 import 'byte_stream.dart';
 
 /// Converts a URL query string (or `application/x-www-form-urlencoded` body)
 /// into a [Map] from parameter names to values.
 ///
 ///     queryToMap("foo=bar&baz=bang&qux");
 ///     //=> {"foo": "bar", "baz": "bang", "qux": ""}
 Map<String, String> queryToMap(String queryList, {Encoding encoding}) {
   var map = {};
   for (var pair in queryList.split("&")) {
@@ skipping 184 matching lines @@
 /// The return values of all [Future]s are discarded. Any errors will cause the
 /// iteration to stop and will be piped through the return value.
 Future forEachFuture(Iterable input, Future fn(element)) {
   var iterator = input.iterator;
   Future nextElement(_) {
     if (!iterator.moveNext()) return new Future.value();
     return fn(iterator.current).then(nextElement);
   }
   return nextElement(null);
 }
+
+/// Like [Future.sync], but wraps the Future in [Chain.track] as well.
+Future syncFuture(callback()) => Chain.track(new Future.sync(callback));

[Bob Nystrom, 2013/12/05 17:35:46]

Maybe this should be added to stack_trace itself?

[nweiz, 2013/12/05 19:27:45]

I don't want to make it part of the public API since it won't be necessary once
issue 15105 is fixed.