Program _uriBaseClosure into the DartVM

sky/engine/bindings/builtin.dart

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 library sky_builtin;
 
 import "dart:async";
 
 // Corelib 'print' implementation.
 void _print(arg) {
@@ skipping 30 matching lines @@
   int _id;
 }
 
 void _scheduleMicrotask(void callback()) native "ScheduleMicrotask";
 Timer _createTimer(int milliseconds,
                    void callback(Timer timer),
                    bool repeating) {
   return new _Timer(milliseconds, callback, repeating);
 }
 
+String _getBaseURLString() native "GetBaseURLString";
+Uri _getBaseURL() => Uri.parse(_getBaseURLString());
+
 _getPrintClosure() => _print;
 _getScheduleMicrotaskClosure() => _scheduleMicrotask;
+_getGetBaseURLClosure() =>_getBaseURL;
 _getCreateTimerClosure() => _createTimer;