Port sky-scrollable to Dart

sky/examples/data/cities.sky

 <!--
 // Copyright 2014 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.
 -->
 <script>
-module.exports = [
+final List<Map> kData = [
   {"name":"New York","state":"New York","population":8363710},
   {"name":"Los Angeles","state":"California","population":3833995},
   {"name":"Chicago","state":"Illinois","population":2853114},
   {"name":"Houston","state":"Texas","population":2242193},
   {"name":"Phoenix","state":"Arizona","population":1567924},
   {"name":"Philadelphia","state":"Pennsylvania","population":1447395},
   {"name":"San Antonio","state":"Texas","population":1351305},
   {"name":"Dallas","state":"Texas","population":1279910},
   {"name":"San Diego","state":"California","population":1279329},
   {"name":"San Jose","state":"California","population":948279},
@@ skipping 4981 matching lines @@
   {"name":"Blanchester","state":"Ohio","population":4303},
   {"name":"Waverly","state":"New York","population":4303},
   {"name":"Wolverine Lake","state":"Michigan","population":4303},
   {"name":"Jersey Shore","state":"Pennsylvania","population":4302},
   {"name":"Kenneth City","state":"Florida","population":4300},
   {"name":"Jenkintown","state":"Pennsylvania","population":4299},
   {"name":"Hartwell","state":"Georgia","population":4298},
   {"name":"Newport","state":"North Carolina","population":4298}
 ];
 </script>