Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components-chromium/polymer/polymer-extracted.js

+
+
+  Polymer.Base._addFeature({
+
+    _registerFeatures: function() {
+      // identity
+      this._prepIs();
+      // inheritance
+      this._prepExtends();
+      // factory
+      this._prepConstructor();
+      // template
+      this._prepTemplate();
+      // template markup
+      this._prepAnnotations();
+      // accessors
+      this._prepEffects();
+      // shared behaviors
+      this._prepBehaviors();
+      // accessors part 2
+      this._prepBindings();
+      // dom encapsulation
+      this._prepShady();
+    },
+
+    _prepBehavior: function(b) {
+      this._addPropertyEffects(b.properties || b.accessors);
+      this._addComplexObserverEffects(b.observers);
+    },
+
+    _initFeatures: function() {
+      // manage local dom
+      this._poolContent();
+      // manage configuration
+      this._setupConfigure();
+      // host stack
+      this._pushHost();
+      // instantiate template
+      this._stampTemplate();
+      // host stack
+      this._popHost();
+      // concretize template references
+      this._marshalAnnotationReferences();
+      // setup debouncers
+      this._setupDebouncers();
+      // concretize effects on instance
+      this._marshalInstanceEffects();
+      // acquire instance behaviors
+      this._marshalBehaviors();
+      // acquire initial instance attribute values
+      this._marshalAttributes();
+      // top-down initial distribution, configuration, & ready callback
+      this._tryReady();
+    },
+
+    _marshalBehavior: function(b) {
+      // publish attributes to instance
+      this._installHostAttributes(b.hostAttributes);
+      // establish listeners on instance
+      this._listenListeners(b.listeners);
+    }
+
+  });
+