Changes in polymer-expressions to prepare for codegen in polymer:

pkg/polymer/test/prop_attr_bind_reflection_test.dart

Index: pkg/polymer/test/prop_attr_bind_reflection_test.dart
diff --git a/pkg/polymer/test/prop_attr_bind_reflection_test.dart b/pkg/polymer/test/prop_attr_bind_reflection_test.dart
index bfe16bfb791aac961669538979d5aa38cfc169b8..57cd21c06a94e1c88da752155426edad14ecf375 100644
--- a/pkg/polymer/test/prop_attr_bind_reflection_test.dart
+++ b/pkg/polymer/test/prop_attr_bind_reflection_test.dart
@@ -12,6 +12,9 @@ class MyChildElement extends PolymerElement {
   @published int camelCase;
   @published int lowercase;
 
+  // TODO(sigmund): remove once codegen in polymer is turned on.
+  @reflectable get attributes => super.attributes;
+
   MyChildElement.created() : super.created();
 
   // Make this a no-op, so we can verify the initial