Sky support for flexbox justify content

sky/sdk/lib/framework/fn2.dart

 // Copyright 2015 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 fn;
 
 import 'app.dart';
 import 'dart:async';
 import 'dart:collection';
 import 'dart:mirrors';
@@ skipping 701 matching lines @@
     assert(false);
     // Paragraph does not support having children currently
   }
 }
 
 class FlexContainer extends MultiChildRenderObjectWrapper {
   RenderFlex root;
   RenderFlex createNode() => new RenderFlex(direction: this.direction);
 
   final FlexDirection direction;
+  final FlexJustifyContent justifyContent;
 
   FlexContainer({
     Object key,
     List<UINode> children,
-    this.direction: FlexDirection.horizontal
+    this.direction: FlexDirection.horizontal,
+    this.justifyContent: FlexJustifyContent.flexStart
   }) : super(key: key, children: children);
 
   void syncRenderObject(UINode old) {
     super.syncRenderObject(old);
     root.direction = direction;
+    root.justifyContent = justifyContent;
   }
 }
 
 class FlexExpandingChild extends ParentDataNode {
   FlexExpandingChild(UINode content, [int flex = 1])
     : super(content, new FlexBoxParentData()..flex = flex);
 }
 
 class Image extends RenderObjectWrapper {
   RenderImage root;
@@ skipping 291 matching lines @@
     assert(root.parent is RenderView);
   }
 }
 
 class Text extends Component {
   Text(this.data) : super(key: '*text*');
   final String data;
   bool get interchangeable => true;
   UINode build() => new Paragraph(text: data);
 }