Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components/iron-selector/iron-selector.html

Index: third_party/polymer/v0_8/components/iron-selector/iron-selector.html
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+<!--
+Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+
+<!--
+`iron-selector` is an element which can be used to manage a list of elements
+that can be selected.  Tapping on the item will make the item selected.  The `selected` indicates
+which item is being selected.  The default is to use the index of the item.
+
+Example:
+
+    <iron-selector selected="0">
+      <div>Item 1</div>
+      <div>Item 2</div>
+      <div>Item 3</div>
+    </iron-selector>
+
+If you want to use the attribute value of an element for `selected` instead of the index,
+set `attrForSelected` to the name of the attribute.  For example, if you want to select item by
+`name`, set `attrForSelected` to `name`.
+
+Example:
+
+    <iron-selector attr-for-selected="name" selected="foo">
+      <div name="foo">Foo</div>
+      <div name="bar">Bar</div>
+      <div name="zot">Zot</div>
+    </iron-selector>
+
+`iron-selector` is not styled. Use the `iron-selected` CSS class to style the selected element.
+
+Example:
+
+    <style>
+      .iron-selected {
+        background: #eee;
+      }
+    </style>
+
+    ...
+
+    <iron-selector selected="0">
+      <div>Item 1</div>
+      <div>Item 2</div>
+      <div>Item 3</div>
+    </iron-selector>
+
+@group Polymer Core Elements
+@element iron-selector
+@homepage github.io
+-->
+
+<link rel="import" href="../polymer/polymer.html">
+<link rel="import" href="iron-multi-selectable.html">
+
+<script>
+
+  Polymer({
+
+    is: 'iron-selector',
+
+    behaviors: [
+      Polymer.IronMultiSelectableBehavior
+    ]
+
+  });
+
+</script>