Rename App to MaterialApp

MaterialApp assumes that you're using material design.

Also move radial reaction and fix imports for stats box.

examples/address_book/lib/main.dart

@@ -94,7 +94,7 @@ final ThemeData theme = new ThemeData(
 );
 
 void main() {
-  runApp(new App(
+  runApp(new MaterialApp(
     title: 'Address Book',
     theme: theme,
     routes: <String, RouteBuilder>{

examples/demo_launcher/lib/main.dart

@@ -201,7 +201,7 @@ class DemoHome extends StatelessComponent {
 }
 
 void main() {
-  runApp(new App(
+  runApp(new MaterialApp(
     title: 'Flutter Demos',
     theme: _theme,
     routes: {

examples/fitness/lib/main.dart

@@ -125,7 +125,7 @@ class FitnessAppState extends State<FitnessApp> {
   }
 
   Widget build(BuildContext) {
-    return new App(
+    return new MaterialApp(
       theme: new ThemeData(
         brightness: ThemeBrightness.light,
         primarySwatch: Colors.indigo,

examples/game/example_effect_line.dart

@@ -53,7 +53,7 @@ class TestAppState extends State<TestApp> {
   ];
 
   Widget build(BuildContext context) {
-    return new App(
+    return new MaterialApp(
       title: 'EffectLine Demo',
       theme: _theme,
       routes: {

examples/game/lib/main.dart

@@ -81,7 +81,7 @@ class GameDemoState extends State<GameDemo> {
   int _lastScore = 0;
 
   Widget build(BuildContext context) {
-    return new App(
+    return new MaterialApp(
       title: 'Asteroids',
       theme: _theme,
       routes: {

examples/game/test_bed.dart

@@ -32,7 +32,7 @@ main() async {
   runApp(_app);
 }
 
-class TestBedApp extends App {
+class TestBedApp extends MaterialApp {
 
   Widget build() {
     ThemeData theme = new ThemeData(

examples/game/test_drawatlas.dart

@@ -32,7 +32,7 @@ main() async {
   String json = await _bundle.loadString('assets/sprites.json');
   _spriteSheet = new SpriteSheet(_images['assets/sprites.png'], json);
 
-  runApp(new App(
+  runApp(new MaterialApp(
     title: 'Test drawAtlas',
     theme: _theme,
     routes: {

examples/game/test_performance.dart

@@ -33,7 +33,7 @@ main() async {
   String json = await _bundle.loadString('assets/sprites.json');
   _spriteSheet = new SpriteSheet(_images['assets/sprites.png'], json);
 
-  runApp(new App(
+  runApp(new MaterialApp(
     title: 'Test Sprite Performance',
     theme: _theme,
     routes: {

examples/game/test_physics.dart

@@ -27,7 +27,7 @@ main() async {
   String json = await _bundle.loadString('assets/sprites.json');
   _spriteSheet = new SpriteSheet(_images['assets/sprites.png'], json);
 
-  runApp(new App(
+  runApp(new MaterialApp(
     title: 'Test Physics',
     theme: new ThemeData(
       brightness: ThemeBrightness.light,

examples/stocks/lib/main.dart

@@ -87,7 +87,7 @@ class StocksAppState extends State<StocksApp> {
   }
 
   Widget build(BuildContext context) {
-    return new App(
+    return new MaterialApp(
       title: 'Stocks',
       theme: theme,
       routes: <String, RouteBuilder>{

examples/widgets/card_collection.dart

@@ -372,7 +372,7 @@ class CardCollectionState extends State<CardCollection> {
 }
 
 void main() {
-  runApp(new App(
+  runApp(new MaterialApp(
     title: 'Cards',
     routes: {
       '/': (RouteArguments args) => new CardCollection(navigator: args.navigator),

examples/widgets/drag_and_drop.dart

@@ -129,7 +129,7 @@ class DragAndDropAppState extends State<DragAndDropApp> {
 }
 
 void main() {
-  runApp(new App(
+  runApp(new MaterialApp(
     title: 'Drag and Drop Flutter Demo',
     routes: {
      '/': (RouteArguments args) => new DragAndDropApp(navigator: args.navigator)

examples/widgets/ensure_visible.dart

@@ -13,7 +13,7 @@ class CardModel {
   Key get key => new ObjectKey(this);
 }
 
-class EnsureVisibleApp extends App {
+class EnsureVisibleApp extends MaterialApp {
 
   static const TextStyle cardLabelStyle =
     const TextStyle(color: Colors.white, fontSize: 18.0, fontWeight: bold);

examples/widgets/indexed_stack.dart

@@ -56,7 +56,7 @@ class IndexedStackDemoState extends State<IndexedStackDemo> {
 }
 
 void main() {
-  runApp(new App(
+  runApp(new MaterialApp(
     title: 'IndexedStackDemo',
     theme: new ThemeData(
       brightness: ThemeBrightness.light,

examples/widgets/navigation.dart

@@ -57,7 +57,7 @@ final ThemeData theme = new ThemeData(
 );
 
 void main() {
-  runApp(new App(
+  runApp(new MaterialApp(
     title: 'Navigation Example',
     theme: theme,
     routes: routes

examples/widgets/overlay_geometry.dart

@@ -156,7 +156,7 @@ class OverlayGeometryAppState extends State<OverlayGeometryApp> {
 }
 
 void main() {
-  runApp(new App(
+  runApp(new MaterialApp(
     theme: new ThemeData(
       brightness: ThemeBrightness.light,
       primarySwatch: Colors.blue,

examples/widgets/pageable_list.dart

@@ -156,7 +156,7 @@ class PageableListAppState extends State<PageableListApp> {
 }
 
 void main() {
-  runApp(new App(
+  runApp(new MaterialApp(
     title: 'PageableList',
     theme: new ThemeData(
       brightness: ThemeBrightness.light,

examples/widgets/sector.dart

@@ -16,7 +16,7 @@ RenderBox initCircle() {
   );
 }
 
-class SectorApp extends App {
+class SectorApp extends MaterialApp {
 
   RenderBoxToRenderSectorAdapter sectors = initCircle();
   math.Random rand = new math.Random(1);

packages/flutter/lib/material.dart

@@ -7,7 +7,6 @@
 /// See https://www.google.com/design/spec/material-design/introduction.html
 library material;
 
-export 'src/material/app.dart';
 export 'src/material/card.dart';
 export 'src/material/checkbox.dart';
 export 'src/material/colors.dart';
@@ -25,10 +24,11 @@ export 'src/material/icon_button.dart';
 export 'src/material/icon.dart';
 export 'src/material/ink_well.dart';
 export 'src/material/input.dart';
-export 'src/material/material_button.dart';
 export 'src/material/material.dart';
-export 'src/material/popup_menu.dart';
+export 'src/material/material_app.dart';
+export 'src/material/material_button.dart';
 export 'src/material/popup_menu_item.dart';
+export 'src/material/popup_menu.dart';
 export 'src/material/progress_indicator.dart';
 export 'src/material/radio.dart';
 export 'src/material/raised_button.dart';
@@ -37,10 +37,11 @@ export 'src/material/shadows.dart';
 export 'src/material/snack_bar.dart';
 export 'src/material/switch.dart';
 export 'src/material/tabs.dart';
-export 'src/material/theme.dart';
 export 'src/material/theme_data.dart';
+export 'src/material/theme.dart';
 export 'src/material/title.dart';
 export 'src/material/tool_bar.dart';
 export 'src/material/typography.dart';
+export 'src/material/radial_reaction.dart';
 
 export 'widgets.dart';

packages/flutter/lib/painting.dart

@@ -13,7 +13,6 @@
 library painting;
 
 export 'src/painting/box_painter.dart';
-export 'src/painting/radial_reaction.dart';
 export 'src/painting/shadows.dart';
 export 'src/painting/text_painter.dart';
 export 'src/painting/text_style.dart';

packages/flutter/lib/rendering.dart

@@ -23,6 +23,7 @@ export 'src/rendering/proxy_box.dart';
 export 'src/rendering/shifted_box.dart';
 export 'src/rendering/binding.dart';
 export 'src/rendering/stack.dart';
+export 'src/rendering/statistics_box.dart';
 export 'src/rendering/toggleable.dart';
 export 'src/rendering/view.dart';
 export 'src/rendering/viewport.dart';

packages/flutter/lib/src/material/material_app.dart

@@ -23,21 +23,15 @@ const TextStyle _errorTextStyle = const TextStyle(
   decorationStyle: TextDecorationStyle.double
 );
 
-class App extends StatefulComponent {
-  App({
+class MaterialApp extends StatefulComponent {
+  MaterialApp({
     Key key,
     this.title,
     this.theme,
     this.routes,
     this.onGenerateRoute
   }) : super(key: key) {
-    assert(() {
-      'The "routes" argument to App() is required.';
-      'This might be a sign that you have not upgraded to our new Widgets framework.';
-      'For more details see: https://groups.google.com/forum/#!topic/flutter-dev/hcX3OvLws9c';
-      '...or look at our examples: https://github.com/flutter/engine/tree/master/examples';
-      return routes != null;
-    });
+    assert(routes != null);
   }
 
   final String title;
@@ -45,10 +39,10 @@ class App extends StatefulComponent {
   final Map<String, RouteBuilder> routes;
   final RouteGenerator onGenerateRoute;
 
-  _AppState createState() => new _AppState();
+  _MaterialAppState createState() => new _MaterialAppState();
 }
 
-class _AppState extends State<App> {
+class _MaterialAppState extends State<MaterialApp> {
 
   GlobalObjectKey _navigator;
 

packages/flutter/lib/src/material/switch.dart

@@ -5,11 +5,12 @@
 import 'dart:async';
 import 'dart:sky' as sky;
 
-import 'package:sky/material.dart';
 import 'package:sky/painting.dart';
 import 'package:sky/rendering.dart';
 import 'package:sky/widgets.dart';
 
+import 'radial_reaction.dart';
+import 'shadows.dart';
 import 'theme.dart';
 
 export 'package:sky/rendering.dart' show ValueChanged;

packages/flutter/lib/src/widgets/statistics_overlay.dart

@@ -2,9 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'framework.dart';
+import 'package:sky/rendering.dart';
 
-import 'package:sky/src/rendering/statistics_box.dart';
+import 'framework.dart';
 
 /// The options that control whether the statistics overlay displays certain
 /// aspects of the compositor

packages/unit/test/widget/drawer_test.dart

@@ -10,7 +10,7 @@ void main() {
     testWidgets((WidgetTester tester) {
       NavigatorState navigator;
       tester.pumpWidget(
-        new App(
+        new MaterialApp(
           routes: {
             '/': (RouteArguments args) {
               navigator = args.navigator;
@@ -39,7 +39,7 @@ void main() {
       NavigatorState navigator;
       tester.pumpWidget(new Container()); // throw away the old App and its Navigator
       tester.pumpWidget(
-        new App(
+        new MaterialApp(
           routes: {
             '/': (RouteArguments args) {
               navigator = args.navigator;

packages/unit/test/widget/snack_bar_test.dart

@@ -10,7 +10,7 @@ void main() {
       GlobalKey<PlaceholderState> placeholderKey = new GlobalKey<PlaceholderState>();
       Key tapTarget = new Key('tap-target');
 
-      tester.pumpWidget(new App(
+      tester.pumpWidget(new MaterialApp(
         routes: {
           '/': (RouteArguments args) {
             return new GestureDetector(