Add support for line-height in TextStyle.

sky/examples/widgets/styled_text.dart

Index: sky/examples/widgets/styled_text.dart
diff --git a/sky/examples/widgets/styled_text.dart b/sky/examples/widgets/styled_text.dart
index 42d34ff6421a5740a8c929accbace2070ba1094b..2f5e6f3a0c9c11de0579fd3fb4fef2d55f60476c 100644
--- a/sky/examples/widgets/styled_text.dart
+++ b/sky/examples/widgets/styled_text.dart
@@ -8,7 +8,6 @@ import 'package:sky/rendering/flex.dart';
 import 'package:sky/rendering/sky_binding.dart';
 import 'package:sky/theme/colors.dart';
 import 'package:sky/theme/theme_data.dart';
-import 'package:sky/theme/typography.dart';
 import 'package:sky/widgets/basic.dart';
 import 'package:sky/widgets/material.dart';
 import 'package:sky/widgets/scaffold.dart';
@@ -43,7 +42,7 @@ 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 daveStyle = new TextStyle(color: Indigo[400], height: 1.8);
   final TextStyle halStyle = new TextStyle(color: Red[400], fontFamily: "monospace");
   final TextStyle boldStyle = const TextStyle(fontWeight: bold);
   final TextStyle underlineStyle = const TextStyle(