Make examples which do not yet support skyx still work in skyx mode.

sky/sdk/example/demo_launcher/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';
 
 import 'package:sky/mojo/activity.dart' as activity;
 import 'package:sky/mojo/asset_bundle.dart';
 import 'package:sky/mojo/shell.dart' as shell;
 import 'package:sky/painting/box_painter.dart';
@@ skipping 12 matching lines @@
 AssetBundle _initBundle() {
   if (rootBundle != null)
     return rootBundle;
   const String _kAssetBase = '..';
   return new NetworkAssetBundle(Uri.base.resolve(_kAssetBase));
 }
 
 final AssetBundle _bundle = _initBundle();
 
 void launch(String relativeUrl, String bundle) {
-  Uri url = Uri.base.resolve(relativeUrl);
+  // TODO(eseidel): This is a hack to keep non-skyx examples working for now:
+  Uri productionBase = Uri.parse(
+    'https://domokit.github.io/example/demo_launcher/lib/main.dart');
+  Uri base = rootBundle == null ? Uri.base : productionBase;
+  Uri url = base.resolve(relativeUrl);
 
   activity.ComponentName component = new activity.ComponentName()
     ..packageName = 'org.domokit.sky.demo'
     ..className = 'org.domokit.sky.demo.SkyDemoActivity';
   activity.Intent intent = new activity.Intent()
     ..action = 'android.intent.action.VIEW'
     ..component = component
     ..flags = activity.MULTIPLE_TASK | activity.NEW_DOCUMENT
     ..url = url.toString();
 
@@ skipping 144 matching lines @@
           )
         )
       )
     );
   }
 }
 
 void main() {
   runApp(new SkyHome());
 }