Give ParentDataNodes snappier names

sky/examples/stocks2/lib/stock_row.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.
 
 import 'package:sky/rendering/box.dart';
 import 'package:sky/theme2/typography.dart' as typography;
 import 'package:sky/widgets/ink_well.dart';
 import 'package:sky/widgets/basic.dart';
 import 'package:sky/rendering/paragraph.dart';
 
@@ skipping 11 matching lines @@
   UINode build() {
     String lastSale = "\$${stock.lastSale.toStringAsFixed(2)}";
 
     String changeInPrice = "${stock.percentChange.toStringAsFixed(2)}%";
     if (stock.percentChange > 0) changeInPrice = "+" + changeInPrice;
 
     List<UINode> children = [
       new Container(
           child: new StockArrow(percentChange: stock.percentChange),
           margin: const EdgeDims.only(right: 5.0)),
-      new FlexExpandingChild(new Text(stock.symbol), flex: 2, key: "symbol"),
+      new Flexible(child: new Text(stock.symbol), flex: 2, key: "symbol"),
       // TODO(hansmuller): text-align: right
-      new FlexExpandingChild(new Text(lastSale,
+      new Flexible(child: new Text(lastSale,
             style: const TextStyle(textAlign: TextAlign.right)),
           key: "lastSale"),
-      new FlexExpandingChild(new Text(changeInPrice,
+      new Flexible(child: new Text(changeInPrice,
           style: typography.black.caption.copyWith(textAlign: TextAlign.right)),
         key: "changeInPrice")
     ];
 
     // TODO(hansmuller): An explicit |height| shouldn't be needed
     return new InkWell(
       child: new Container(
         padding: const EdgeDims(16.0, 16.0, 20.0, 16.0),
         height: kHeight,
         decoration: const BoxDecoration(
             border: const Border(
                 bottom: const BorderSide(color: const Color(0xFFF4F4F4)))),
         child: new Flex(children)
       )
     );
   }
 }