Added title (#614)

animations/lib/src/misc/animated_list.dart

@@ -68,6 +68,7 @@ class _AnimatedListDemoState extends State<AnimatedListDemo> {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
+        title: Text('AnimatedList'),
         actions: <Widget>[
           IconButton(
             icon: Icon(Icons.add),

animations/lib/src/misc/animated_positioned.dart

@@ -38,7 +38,7 @@ class _AnimatedPositionedDemoState extends State<AnimatedPositionedDemo> {
   @override
   Widget build(BuildContext context) {
     final size = MediaQuery.of(context).size;
-    final appBar = AppBar();
+    final appBar = AppBar(title: Text('AnimatedPositioned'));
     final topPadding = MediaQuery.of(context).padding.top;
     // AnimatedPositioned animates changes to a widget's position within a Stack
     return SafeArea(

animations/lib/src/misc/animated_switcher.dart

@@ -44,6 +44,7 @@ class _AnimatedSwitcherDemoState extends State<AnimatedSwitcherDemo> {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
+        title: Text('AnimatedSwitcher'),
         actions: [
           MaterialButton(
             onPressed: () => setState(

animations/lib/src/misc/expand_card.dart

@@ -10,7 +10,9 @@ class ExpandCardDemo extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(),
+      appBar: AppBar(
+        title: Text('Expandable Card'),
+      ),
       body: Center(
         child: ExpandCard(),
       ),

animations/lib/src/misc/hero_animation.dart

@@ -10,7 +10,9 @@ class HeroAnimationDemo extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(),
+      appBar: AppBar(
+        title: Text('Hero Animation'),
+      ),
       body: GestureDetector(
         child: Hero(
           tag: 'hero-page-child',

animations/lib/src/misc/physics_card_drag.dart

@@ -11,7 +11,9 @@ class PhysicsCardDragDemo extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(),
+      appBar: AppBar(
+        title: Text('Spring Physics'),
+      ),
       body: DraggableCard(
         child: FlutterLogo(
           size: 128,