Update to polymer js version 0.4.1

pkg/polymer/lib/src/declaration.dart

Index: pkg/polymer/lib/src/declaration.dart
diff --git a/pkg/polymer/lib/src/declaration.dart b/pkg/polymer/lib/src/declaration.dart
index fb5c8c95e64373f1cc63b65f2de3aa2914887a9f..1dedadaa266041b59944768731425f7dc64a8d54 100644
--- a/pkg/polymer/lib/src/declaration.dart
+++ b/pkg/polymer/lib/src/declaration.dart
@@ -462,6 +462,10 @@ class PolymerDeclaration {
     // createPolymerAccessors is done lazily on the first access of properties.
     // Here we just extract the information from annotations and store it as
     // properties on the declaration.
+
+    // Dart Note: The js side makes computed properties read only, and does
+    // special logic right here for them. For us they are automatically read
+    // only unless you define a setter for them, so we left that out.
     var options = const smoke.QueryOptions(includeInherited: true,
         includeUpTo: HtmlElement, withAnnotations: const [ComputedProperty]);
     var existing = {};
@@ -483,6 +487,8 @@ final Map _typesByName = new Map<String, Type>();
 
 Type _getRegisteredType(String name) => _typesByName[name];
 
+/// Dart Note: instanceOfType not implemented for dart, its not needed.
+
 /// track document.register'ed tag names and their declarations
 final Map _declarations = new Map<String, PolymerDeclaration>();