Add Future.timeout.

pkg/barback/lib/src/cancelable_future.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 barback.cancelable_future;
 
 import 'dart:async';
 
 /// A wrapper for [Future] that can be cancelled.
 ///
@@ skipping 14 matching lines @@
       _completer.completeError(error, stackTrace);
     });
   }
 
   Stream<T> asStream() => _completer.future.asStream();
   Future catchError(Function onError, {bool test(error)}) =>
     _completer.future.catchError(onError, test: test);
   Future then(onValue(T value), {Function onError}) =>
     _completer.future.then(onValue, onError: onError);
   Future<T> whenComplete(action()) => _completer.future.whenComplete(action);
-
+  Future timeout(Duration timeLimit, [void onTimeout()]) =>
+      _completer.future.timeout(timeLimit, onTimeout);

[nweiz, 2013/11/27 20:50:36]

Style nit: indent two spaces. Same for other files.

[Lasse Reichstein Nielsen, 2013/11/28 08:11:24]

Done, for consistency, but I'm fairly sure the style guide wants four spaces
here. It's a continued line, and not a nested code block. The one example that
uses the syntax is:
bobLikes() =>
    isDeepFried || (hasPieCrust && !vegan) || containsBacon;
and it uses four spaces.

   /// Cancels this future.
   void cancel() {
     _canceled = true;
   }
 }