Frog dart:dom using interfaces and native implementation classes.

client/dom/templates/dom/frog/frog_dom.darttemplate

Index: client/dom/templates/dom/frog/frog_dom.darttemplate
diff --git a/client/dom/templates/dom/frog/frog_dom.darttemplate b/client/dom/templates/dom/frog/frog_dom.darttemplate
index fb6c061c351e2daaf63a2bd8d496100fd4599a11..6a890559fa63ff99b9dcfb4e4961d104738b688a 100644
--- a/client/dom/templates/dom/frog/frog_dom.darttemplate
+++ b/client/dom/templates/dom/frog/frog_dom.darttemplate
@@ -15,14 +15,13 @@ $!GENERATED_DART_FILES
 #source('src/RequestAnimationFrameCallback.dart');
 #source('src/TimeoutHandler.dart');
 #source('src/_Collections.dart');
-// #source('src/_FactoryProviders.dart');
+#source('src/frog_FactoryProviders.dart');
 #source('src/_ListIterators.dart');
 #source('src/_Lists.dart');
 
-// TODO(jmesserly): 'native' here is aWork-around for Frog bug.  Frog needs to
-// be smarter about inheriting from a hidden native type (in this case
-// DOMWindow)
-class Window extends DOMWindow native "*Window" {}
+// TODO(sra): What 'window' do we get in a worker?  Perhaps this
+// should return the interface type.
 DOMWindow get window() native "return window;";
+
 // TODO(vsm): Revert to Dart method when 508 is fixed.
 HTMLDocument get document() native "return window.document;";