Improve drawer menu items

sky/sdk/lib/widgets/tabs.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 'dart:math' as math;
 
 import 'package:sky/animation/scroll_behavior.dart';
 import 'package:sky/painting/text_style.dart';
 import 'package:sky/rendering/box.dart';
 import 'package:sky/rendering/object.dart';
@@ skipping 398 matching lines @@
     for (TabLabel label in labels) {
       tabs.add(_toTab(label, tabIndex++));
       if (label.text != null && label.icon != null)
         textAndIcons = true;
     }
 
     ThemeData themeData = Theme.of(this);
     Color backgroundColor = themeData.primaryColor;
     Color indicatorColor = themeData.accentColor;
     if (indicatorColor == backgroundColor) {
-      indicatorColor = colors.White;
+      indicatorColor = colors.white;
     }
 
     TextStyle textStyle;
     IconThemeColor iconThemeColor;
     switch (themeData.primaryColorBrightness) {
       case ThemeBrightness.light:
         textStyle = typography.black.body1;
         iconThemeColor = IconThemeColor.black;
         break;
       case ThemeBrightness.dark:
@@ skipping 69 matching lines @@
       selectedIndex: selectedIndex,
       scrollable: scrollable
     );
 
     Widget content = views[selectedIndex].buildContent();
     return new Flex([tabBar, new Flexible(child: content)],
       direction: FlexDirection.vertical
     );
   }
 }