Update TodoMVC based on https://github.com/polymer/todomvc

samples/third_party/todomvc/web/lib-elements/polymer_selector.html

Index: samples/third_party/todomvc/web/lib-elements/polymer_selector.html
diff --git a/samples/third_party/todomvc/web/lib-elements/polymer_selector.html b/samples/third_party/todomvc/web/lib-elements/polymer_selector.html
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+<!--
+Copyright 2013 The Polymer Authors. All rights reserved.
+Use of this source code is governed by a BSD-style
+license that can be found in the LICENSE file.
+-->
+<!--
+/**
+ * polymer-selector is used to display a list of elements that can be selected.
+ * The attribute "selected" indicates which element is being selected.
+ * Tapping on the element to change selection would fire "polymer-activate"
+ * event.
+ *
+ * Example:
+ *
+ *     <polymer-selector selected="0" on-polymer-activate="{{activateAction}}">
+ *       <div>Item 1</div>
+ *       <div>Item 2</div>
+ *       <div>Item 3</div>
+ *     </polymer-selector>
+ *
+ * polymer-selector is not styled.  So one needs to use "selected" CSS class
+ * to style the selected element.
+ *
+ *     <style>
+ *       .item.polymer-selected {
+ *         background: #eee;
+ *       }
+ *     </style>
+ *     ...
+ *     <polymer-selector>
+ *       <div class="item">Item 1</div>
+ *       <div class="item">Item 2</div>
+ *       <div class="item">Item 3</div>
+ *     </polymer-selector>
+ */
+-->
+<link rel="import" href="polymer_selection.html">
+
+<polymer-element name="polymer-selector" on-tap="{{activateHandler}}"
+    touch-action="none">
+  <template>
+    <polymer-selection id="selection" multi="{{multi}}"
+        on-polymer-select="{{selectionSelect}}"></polymer-selection>
+    <content id="items" select="*"></content>
+  </template>
+  <script type="application/dart" src="polymer_selector.dart"></script>
+</polymer-element>