Deploy TaskDescription to the rest of our demos

sky/sdk/example/mine_digger/lib/main.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:sky' as sky;
 import 'dart:math';
 
+import 'package:sky/painting/text_style.dart';
 import 'package:sky/rendering/flex.dart';
+import 'package:sky/theme/colors.dart' as colors;
 import 'package:sky/widgets/basic.dart';
 import 'package:sky/widgets/scaffold.dart';
+import 'package:sky/widgets/task_description.dart';
+import 'package:sky/widgets/theme.dart';
 import 'package:sky/widgets/tool_bar.dart';
-import 'package:sky/widgets/theme.dart';
-import 'package:sky/theme/colors.dart' as colors;
-import 'package:sky/painting/text_style.dart';
 
 // Classic minesweeper-inspired game. The mouse controls are standard except
 // for left + right combo which is not implemented. For touch, the duration of
 // the pointer determines probing versus flagging.
 //
 // There are only 3 classes to understand. Game, which is contains all the
 // logic and two UI classes: CoveredMineNode and ExposedMineNode, none of them
 // holding state.
 
 class Game {
@@ skipping 142 matching lines @@
         onPointerDown: handleBannerPointerDown,
         child: new Text(banner, style: Theme.of(this.app).text.title)
       )
     );
   }
 
   Widget buildUI() {
     // FIXME: We need to build the board before we build the toolbar because
     // we compute the win state during build step.
     Widget board = buildBoard();
-    return new Scaffold(
-      toolbar: buildToolBar(),
-      body: new Container(
-        child: new Center(child: board),
-        decoration: new BoxDecoration(backgroundColor: colors.Grey[50])
+    return new TaskDescription(
+      label: 'Mine Digger',
+      child: new Scaffold(
+        toolbar: buildToolBar(),
+        body: new Container(
+          child: new Center(child: board),
+          decoration: new BoxDecoration(backgroundColor: colors.Grey[50])
+        )
       )
     );
   }
 
   void handleBannerPointerDown(sky.PointerEvent event) {
     initialize();
     app.scheduleBuild();
   }
 
   // User action. The user uncovers the cell which can cause losing the game.
@@ skipping 171 matching lines @@
   }
 
   Widget build() {
     return game.buildUI();
   }
 }
 
 void main() {
   runApp(new MineDiggerApp());
 }