Adds TextStyle decoration, decorationColor, decorationStyle

sky/examples/widgets/styled_text.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/painting/text_style.dart';
 import 'package:sky/rendering/box.dart';
 import 'package:sky/rendering/flex.dart';
 import 'package:sky/rendering/sky_binding.dart';
 import 'package:sky/theme/colors.dart';
 import 'package:sky/theme/typography.dart';
@@ skipping 25 matching lines @@
 Dave: What's the problem?
 HAL: I think you know what the problem is just as well as I do.
 Dave: What are you talking about, HAL?
 HAL: This mission is too important for me to allow you to jeopardize it.''';
 
   // [["Dave", "Open the pod bay..."] ...]
   List<List<String>> nameLines;
 
   final TextStyle daveStyle = new TextStyle(color: Indigo[400]);
   final TextStyle halStyle = new TextStyle(color: Red[400], fontFamily: "monospace");
-  final TextStyle boldStyle = new TextStyle(fontWeight: bold);
+  final TextStyle boldStyle = const TextStyle(fontWeight: bold);
+  final TextStyle underlineStyle = const TextStyle(decoration: underline);
   
   Component toStyledText(String name, String text) {
     TextStyle lineStyle = (name == "Dave") ? daveStyle : halStyle;
     return new StyledText(
       key: text,
-      elements: [lineStyle, [boldStyle, name + ":"], text]
+      elements: [lineStyle, [boldStyle, [underlineStyle, name], ":"], text]
     );
   }
 
   Component toPlainText(String name, String text) => new Text(name + ":" + text);
 
   Component createSeparator() {
     return new Container(
       constraints: const BoxConstraints(minWidth: double.INFINITY, maxHeight: 0.0),
       margin: const EdgeDims.symmetric(vertical: 10.0, horizontal: 64.0),
       decoration: const BoxDecoration(
@@ skipping 47 matching lines @@
   }
 }
 
 void main() {
   runApp(new StyledTextApp());
   SkyBinding.instance.onFrame = () {
     // uncomment this for debugging:
     // SkyBinding.instance.debugDumpRenderTree();
   };
 }