Turn on wavy underlines. The waves aren't very pretty yet (they are too short...

Turn on wavy underlines. The waves aren't very pretty yet (they are too short somehow), I'll fix that in a subsequent CL.

I abstracted out the wavy underline code so that it doesn't duplicate the code for horizontal and vertical lines.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1201503003.

examples/widgets/styled_text.dart

@@ -44,7 +44,11 @@ HAL: This mission is too important for me to allow you to jeopardize it.''';
   final TextStyle daveStyle = new TextStyle(color: Indigo[400]);
   final TextStyle halStyle = new TextStyle(color: Red[400], fontFamily: "monospace");
   final TextStyle boldStyle = const TextStyle(fontWeight: bold);
-  final TextStyle underlineStyle = const TextStyle(decoration: underline);
+  final TextStyle underlineStyle = const TextStyle(
+    decoration: underline,
+    decorationColor: const Color(0xFF000000),
+    decorationStyle: TextDecorationStyle.wavy
+  );
   
   Component toStyledText(String name, String text) {
     TextStyle lineStyle = (name == "Dave") ? daveStyle : halStyle;