Use Theme to define the colors and TextStyles for Tab, TabBar

sky/tests/examples/tabs.dart

Index: sky/tests/examples/tabs.dart
diff --git a/sky/tests/examples/styled_text.dart b/sky/tests/examples/tabs.dart
similarity index 82%
copy from sky/tests/examples/styled_text.dart
copy to sky/tests/examples/tabs.dart
index 137ec0cd9402126d23b908944bdb87cf12099b3e..a691a9bd99e98d1f8014b210e0604f7564525c86 100644
--- a/sky/tests/examples/styled_text.dart
+++ b/sky/tests/examples/tabs.dart
@@ -6,12 +6,12 @@ import 'dart:async';
 
 import 'package:sky/widgets/widget.dart';
 
-import '../../examples/widgets/styled_text.dart';
+import '../../examples/widgets/tabs.dart';
 import '../resources/display_list.dart';
 
 main() async {
   TestRenderView testRenderView = new TestRenderView();
-  StyledTextApp app = new StyledTextApp();
+  TabbedNavigatorApp app = new TabbedNavigatorApp();
   runApp(app, renderViewOverride: testRenderView);
   await testRenderView.checkFrame();
   testRenderView.endTest();