Move fn.dart into /sky/framework

sky/examples/fn/lib/style.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.
-
-part of fn;
-
-class Style {
-  final String _className;
-  static final Map<String, Style> _cache = new HashMap<String, Style>();
-
-  static int nextStyleId = 1;
-
-  static String nextClassName(String styles) {
-    assert(sky.document != null);
-    String className = "style$nextStyleId";
-    nextStyleId++;
-
-    sky.Element styleNode = sky.document.createElement('style');
-    styleNode.setChild(new sky.Text(".$className { $styles }"));
-    sky.document.appendChild(styleNode);
-
-    return className;
-  }
-
-  factory Style(String styles) {
-    return _cache.putIfAbsent(styles, () {
-      return new Style._internal(nextClassName(styles));
-    });
-  }
-
-  Style._internal(this._className);
-}