Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components/polymer/src/micro/tag.html

Index: third_party/polymer/v0_8/components/polymer/src/micro/tag.html
diff --git a/third_party/polymer/v0_8/components/polymer/src/micro/tag.html b/third_party/polymer/v0_8/components/polymer/src/micro/tag.html
new file mode 100644
index 0000000000000000000000000000000000000000..885a24d753d1fa9c2d928b141b05e997c1d34460
--- /dev/null
+++ b/third_party/polymer/v0_8/components/polymer/src/micro/tag.html
@@ -0,0 +1,28 @@
+<!--
+@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>
+
+  Polymer.Base._addFeature({
+
+    _prepIs: function() {
+      if (!this.is) {
+        var module =
+          (document._currentScript || document.currentScript).parentNode;
+        if (module.localName === 'dom-module') {
+          var id = module.id || module.getAttribute('name')
+            || module.getAttribute('is')
+          this.is = id;
+        }
+      }
+    }
+
+  });
+
+</script>