fixes to polymer, gets tests back to a stable state

pkg/polymer/test/attr_deserialize_test.dart

Index: pkg/polymer/test/attr_deserialize_test.dart
diff --git a/pkg/polymer/test/attr_deserialize_test.dart b/pkg/polymer/test/attr_deserialize_test.dart
index 911435d0ae8d247234b006b45ab54873d4d64987..5530dc45beea69c7bcba17663669e603c4018935 100644
--- a/pkg/polymer/test/attr_deserialize_test.dart
+++ b/pkg/polymer/test/attr_deserialize_test.dart
@@ -22,6 +22,8 @@ class MyElement extends PolymerElement {
 @initMethod _main() {
   useHtmlConfiguration();
 
+  setUp(() => Polymer.onReady);
+
   test('attributes were deserialized', () {
     MyElement elem = query('my-element').xtag;
     final msg = 'property should match attribute.';