Fix padding on Sky home screen scrollable list

sky/sdk/home.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';
 
 import 'package:mojom/intents/intents.mojom.dart';
 import 'package:sky/framework/shell.dart' as shell;
 import 'package:sky/painting/box_painter.dart';
 import 'package:sky/theme/colors.dart' as colors;
@@ skipping 88 matching lines @@
   // TODO(eseidel): We could use to separate these groups?
   // new SkyDemo('Old Stocks App', 'examples/stocks/main.sky'),
   // new SkyDemo('Old Touch Demo', 'examples/raw/touch-demo.sky'),
   // new SkyDemo('Old Spinning Square', 'examples/raw/spinning-square.sky'),
 
   // TODO(jackson): This doesn't seem to be working
   // new SkyDemo('Licenses', 'LICENSES.sky'),
 ];
 
 const double kCardHeight = 120.0;
+const EdgeDims kListPadding = const EdgeDims.all(4.0);
 
 class DemoList extends FixedHeightScrollable {
-  DemoList({ String key }) : super(key: key, itemHeight: kCardHeight) {
+  DemoList({ String key }) : super(key: key, itemHeight: kCardHeight, padding: kListPadding) {
     itemCount = demos.length;
   }
 
   Widget buildDemo(SkyDemo demo) {
     return new Listener(
       key: demo.name,
       onGestureTap: (_) => launch(demo.href),
       child: new Container(
         height: kCardHeight,
         child: new Card(
@@ skipping 42 matching lines @@
           child: new DemoList()
         )
       )
     );
   }
 }
 
 void main() {
   runApp(new SkyHome());
 }