Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components/polymer/src/lib/dom-module.html

Index: third_party/polymer/v0_8/components/polymer/src/lib/dom-module.html
diff --git a/third_party/polymer/v0_8/components/polymer/src/lib/dom-module.html b/third_party/polymer/v0_8/components/polymer/src/lib/dom-module.html
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+<script>
+
+(function() {
+
+  var modules = {};
+
+  var DomModule = function() {
+    return document.createElement('dom-module');
+  };
+
+  DomModule.prototype = Object.create(HTMLElement.prototype);
+
+  DomModule.prototype.constructor = DomModule;
+
+  DomModule.prototype.createdCallback = function() {
+    var id = this.id || this.getAttribute('name') || this.getAttribute('is');
+    if (id) {
+      this.id = id;
+      modules[id] = this;
+    }
+  };
+
+  DomModule.prototype.import = function(id, slctr) {
+    var m = modules[id];
+    if (!m) {
+      // If polyfilling, a script can run before a dom-module element
+      // is upgraded. We force the containing document to upgrade
+      // and try again to workaround this polyfill limitation.
+      forceDocumentUpgrade();
+      m = modules[id];
+    }
+    if (m && slctr) {
+      m = m.querySelector(slctr);
+    }
+    return m;
+  };
+
+  // NOTE: HTMLImports polyfill does not
+  // block scripts on upgrading elements. However, we want to ensure that
+  // any dom-module in the tree is available prior to a subsequent script
+  // processing.
+  // Therefore, we force any dom-modules in the tree to upgrade when dom-module
+  // is registered by temporarily setting CE polyfill to crawl the entire
+  // imports tree. (Note: this should only upgrade any imports that have been
+  // loaded by this point. In addition the HTMLImports polyfill should be
+  // changed to upgrade elements prior to running any scripts.)
+  var cePolyfill = window.CustomElements && !CustomElements.useNative;
+  if (cePolyfill) {
+    var ready = CustomElements.ready;
+    CustomElements.ready = true;
+  }
+  document.registerElement('dom-module', DomModule);
+  if (cePolyfill) {
+    CustomElements.ready = ready;
+  }
+
+  function forceDocumentUpgrade() {
+    if (cePolyfill) {
+      var script = document._currentScript || document.currentScript;
+      if (script) {
+        CustomElements.upgradeAll(script.ownerDocument);
+      }
+    }
+  }
+
+})();
+
+</script>