Pull args, intl, logging, shelf, and source_maps out of the SDK.

pkg/shelf/lib/src/util.dart

-// Copyright (c) 2014, 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 shelf.util;
-
-import 'dart:async';
-
-import 'package:stack_trace/stack_trace.dart';
-
-/// Like [new Future], but avoids around issue 11911 by using [new Future.value]
-/// under the covers.
-Future newFuture(callback()) => new Future.value().then((_) => callback());
-
-/// Like [Future.sync], but wraps the Future in [Chain.track] as well.
-Future syncFuture(callback()) => Chain.track(new Future.sync(callback));
-
-/// Run [callback] and capture any errors that would otherwise be top-leveled.
-///
-/// If [this] is called in a non-root error zone, it will just run [callback]
-/// and return the result. Otherwise, it will capture any errors using
-/// [runZoned] and pass them to [onError].
-catchTopLevelErrors(callback(), void onError(error, StackTrace stackTrace)) {
-  if (Zone.current.inSameErrorZone(Zone.ROOT)) {
-    return runZoned(callback, onError: onError);
-  } else {
-    return callback();
-  }
-}
-
-/// Returns a [Map] with the values from [original] and the values from
-/// [updates].
-///
-/// For keys that are the same between [original] and [updates], the value in
-/// [updates] is used.
-///
-/// If [updates] is `null` or empty, [original] is returned unchanged.
-Map updateMap(Map original, Map updates) {
-  if (updates == null || updates.isEmpty) return original;
-
-  return new Map.from(original)
-      ..addAll(updates);
-}