Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components/polymer/src/lib/lang.html

Index: third_party/polymer/v0_8/components/polymer/src/lib/lang.html
diff --git a/third_party/polymer/v0_8/components/polymer/src/lib/lang.html b/third_party/polymer/v0_8/components/polymer/src/lib/lang.html
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index 0000000000000000000000000000000000000000..d80e8fd1b6d3869a088147ad12d04c03fc159cc9
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+++ b/third_party/polymer/v0_8/components/polymer/src/lib/lang.html
@@ -0,0 +1,21 @@
+<!--
+@license
+Copyright (c) 2014 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
+-->
+<script>
+
+  // a tiny bit of sugar for `document.currentScript.ownerDocument`
+  Object.defineProperty(window, 'currentImport', {
+    enumerable: true,
+    configurable: true,
+    get: function() {
+      return (document._currentScript || document.currentScript).ownerDocument;
+    }
+  });
+
+</script>