Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components/paper-styles/default-theme.html

+<!--
+    @license
+    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
+-->
+
+<link rel="import" href="../polymer/polymer.html">
+
+<style is="x-style">
+
+  * {
+
+    --dark-primary-color: #303f9f;
+
+    --default-primary-color: #3f51b5;
+
+    --light-primary-color: #c5cae9;
+
+    --text-primary-color: #ffffff;
+
+    --accent-color: #ff4081;
+
+    --primary-background-color: #ffffff;
+
+    --primary-text-color: #212121;
+
+    --secondary-text-color: #757575;
+
+    --disabled-text-color: #bdbdbd;
+
+    --divider-color: #e0e0e0;
+
+  }
+
+</style>