Move sky/examples to sky/sdk/lib/example, and code changes to support that change. Fixes T277.

sky/examples/stocks/lib/stock_menu.dart

Index: sky/examples/stocks/lib/stock_menu.dart
diff --git a/sky/examples/stocks/lib/stock_menu.dart b/sky/examples/stocks/lib/stock_menu.dart
deleted file mode 100644
index 33d19831685a536f6bb44b06279228a4bb56d1e8..0000000000000000000000000000000000000000
--- a/sky/examples/stocks/lib/stock_menu.dart
+++ /dev/null
@@ -1,44 +0,0 @@
-// 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 'package:sky/framework/fn.dart';
-import 'package:sky/framework/layout.dart';
-import 'package:sky/framework/components/popup_menu.dart';
-import 'package:sky/framework/components/checkbox.dart';
-import 'package:sky/framework/theme/view_configuration.dart';
-
-class StockMenu extends Component {
-  static final Style _style = new Style('''
-    position: absolute;
-    right: 8px;
-    top: ${8 + kStatusBarHeight}px;''');
-
-  PopupMenuController controller;
-
-  StockMenu({Object key, this.controller, this.autorefresh: false, this.onAutorefreshChanged}) : super(key: key);
-
-  final bool autorefresh;
-  final ValueChanged onAutorefreshChanged;
-
-  static FlexBoxParentData _flex1 = new FlexBoxParentData()..flex = 1;
-
-  UINode build() {
-    var checkbox = new Checkbox(
-      checked: this.autorefresh,
-      onChanged: this.onAutorefreshChanged
-    );
-
-    return new StyleNode(
-      new PopupMenu(
-        controller: controller,
-        items: [
-          [new Text('Add stock')],
-          [new Text('Remove stock')],
-          [new ParentDataNode(new Text('Autorefresh'), _flex1), checkbox],
-        ],
-        level: 4),
-        _style
-    );
-  }
-}