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

pkg/http/lib/src/utils.dart

Index: pkg/http/lib/src/utils.dart
diff --git a/pkg/http/lib/src/utils.dart b/pkg/http/lib/src/utils.dart
index 6a801e194097fd05441b96ba35804b5b1c8a42de..d3a4307620121714b3ce208744703ce43c7534d4 100644
--- a/pkg/http/lib/src/utils.dart
+++ b/pkg/http/lib/src/utils.dart
@@ -9,6 +9,8 @@ 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)
@@ -213,3 +215,6 @@ Future forEachFuture(Iterable input, Future fn(element)) {
   }
   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.