fixes to polymer, gets tests back to a stable state

pkg/polymer/test/instance_attrs_test.dart

Index: pkg/polymer/test/instance_attrs_test.dart
diff --git a/pkg/polymer/test/instance_attrs_test.dart b/pkg/polymer/test/instance_attrs_test.dart
index 45508bc153024a7e3a2c781ff0c77d66277ae6b1..3b531f059a2d7a9d7169e12d8835cea92b9c51d5 100644
--- a/pkg/polymer/test/instance_attrs_test.dart
+++ b/pkg/polymer/test/instance_attrs_test.dart
@@ -20,6 +20,8 @@ class MyElement extends PolymerElement {
 @initMethod _main() {
   useHtmlConfiguration();
 
+  setUp(() => Polymer.onReady);
+
   test('attributes were deserialized', () {
     var elem = query('my-element');