Add support for text styles.

sky/examples/stocks2/lib/stock_app.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/framework/app.dart';
 import 'package:sky/framework/editing2/input.dart';
 import 'package:sky/framework/rendering/box.dart';
+import 'package:sky/framework/rendering/paragraph.dart';
 import 'package:sky/framework/theme2/colors.dart' as colors;
+import 'package:sky/framework/theme2/typography.dart' as typography;
 import 'package:sky/framework/widgets/drawer.dart';
 import 'package:sky/framework/widgets/drawer_header.dart';
 import 'package:sky/framework/widgets/floating_action_button.dart';
 import 'package:sky/framework/widgets/icon.dart';
 import 'package:sky/framework/widgets/icon_button.dart';
 import 'package:sky/framework/widgets/menu_divider.dart';
 import 'package:sky/framework/widgets/menu_item.dart';
 import 'package:sky/framework/widgets/modal_overlay.dart';
 import 'package:sky/framework/widgets/popup_menu.dart';
 import 'package:sky/framework/widgets/radio.dart';
 import 'package:sky/framework/widgets/scaffold.dart';
 import 'package:sky/framework/widgets/tool_bar.dart';
 import 'package:sky/framework/widgets/ui_node.dart';
 import 'package:sky/framework/widgets/wrappers.dart';
 
 import 'stock_data.dart';
 import 'stock_list.dart';
 import 'stock_menu.dart';
 
 enum StockMode { optimistic, pessimistic }
 
 class StocksApp extends App {
 
-  // static final Style _titleStyle = new Style('''
-  //   ${typography.white.title};''');
-
   List<Stock> _stocks = [];
 
   StocksApp({ RenderView renderViewOverride }) : super(renderViewOverride: renderViewOverride) {
     // if (debug)
     //   new Timer(new Duration(seconds: 1), dumpState);
     new StockDataFetcher((StockData data) {
       setState(() {
         data.appendTo(_stocks);
       });
     });
@@ skipping 106 matching lines @@
           children: [new Text('Help & Feedback')])
      ]
     );
   }
 
   UINode buildToolBar() {
     return new ToolBar(
         left: new IconButton(
           icon: 'navigation/menu_white',
           onGestureTap: (_) => _drawerController.toggle()),
-        center: new Text('Stocks'),
+        center: new Text('Stocks', style: typography.white.title),
         right: [
           new IconButton(
             icon: 'action/search_white',
             onGestureTap: _handleSearchBegin),
           new IconButton(
             icon: 'navigation/more_vert_white',
             onGestureTap: _handleMenuShow)
         ],
         backgroundColor: colors.Purple[500]
       );
@@ skipping 42 matching lines @@
 }
 
 void main() {
   print("starting stocks app!");
   App app = new StocksApp();
   UINodeAppView.appView.onFrame = () {
     // uncomment this for debugging:
     // app.appView.debugDumpRenderTree();
   };
 }