Port the remaining of dart:core to the unified corelib.

corelib/unified/core/implementation/future.dart

 // Copyright 2012 Google Inc. All Rights Reserved.
 // Dart core library.
 
 class FutureImpl<T> implements Future<T> {
 
   bool _isComplete = false;
 
   /**
    * Value that was provided to this Future by the Completer
    */
@@ skipping 193 matching lines @@
       }
       future.handleException((e) {
         completer.completeException(e, future.stackTrace);
         return true;
       });
       future.then((b) => completer.complete(b));
     });
     return completer.future;
   }
 }
-
-class CompleterImpl<T> implements Completer<T> {

[Mads Ager (google), 2012/08/01 13:48:34]

Why move this to a separate file? I would leave future_implementation alone for
now since it doesn't require patching.

[Anders Johnsen, 2012/08/01 14:21:09]

Reverting, see other comment.

-
-  final FutureImpl<T> _futureImpl;
-
-  CompleterImpl() : _futureImpl = new FutureImpl() {}
-
-  Future<T> get future() {
-    return _futureImpl;
-  }
-
-  void complete(T value) {
-    _futureImpl._setValue(value);
-  }
-
-  void completeException(Object exception, [Object stackTrace]) {
-    _futureImpl._setException(exception, stackTrace);
-  }
-}