Support for icon theming

sky/sdk/example/widgets/tabs.dart

Index: sky/sdk/example/widgets/tabs.dart
diff --git a/sky/sdk/example/widgets/tabs.dart b/sky/sdk/example/widgets/tabs.dart
index 4b69a6a4e5955a1de2e42189aa66d8fc7153f6ca..00b4521513e05f6559a03a9804e1dc0e7e483ff5 100644
--- a/sky/sdk/example/widgets/tabs.dart
+++ b/sky/sdk/example/widgets/tabs.dart
@@ -48,7 +48,7 @@ class TabbedNavigatorApp extends App {
     Iterable<TabNavigatorView> views = ["event", "home", "android", "alarm", "face", "language"]
       .map((icon_name) {
         return new TabNavigatorView(
-          label: new TabLabel(icon: "action/${icon_name}_white"),
+          label: new TabLabel(icon: "action/${icon_name}"),
           builder: () => _buildContent(icon_name)
         );
       });
@@ -58,15 +58,15 @@ class TabbedNavigatorApp extends App {
   TabNavigator _buildTextAndIconLabelsTabNavigator(int n) {
     List<TabNavigatorView> views = <TabNavigatorView>[
       new TabNavigatorView(
-        label: const TabLabel(text: 'STOCKS', icon: 'action/list_white'),
+        label: const TabLabel(text: 'STOCKS', icon: 'action/list'),
         builder: () => _buildContent("Stocks")
       ),
       new TabNavigatorView(
-        label: const TabLabel(text: 'PORTFOLIO', icon: 'action/account_circle_white'),
+        label: const TabLabel(text: 'PORTFOLIO', icon: 'action/account_circle'),
         builder: () => _buildContent("Portfolio")
       ),
       new TabNavigatorView(
-        label: const TabLabel(text: 'SUMMARY', icon: 'action/assessment_white'),
+        label: const TabLabel(text: 'SUMMARY', icon: 'action/assessment'),
         builder: () => _buildContent("Summary")
       )
     ];