Enables codegen support in polymer

pkg/smoke/pubspec.yaml

Index: pkg/smoke/pubspec.yaml
diff --git a/pkg/smoke/pubspec.yaml b/pkg/smoke/pubspec.yaml
index f6da7d81eaeec27bda4b628bff6b2dc9ce4c79c4..8320a5a9f9e93501749d875e245975a46380fe3e 100644
--- a/pkg/smoke/pubspec.yaml
+++ b/pkg/smoke/pubspec.yaml
@@ -9,14 +9,12 @@ description: >
 dependencies:
   barback: ">=0.9.0 <0.12.0"
   logging: ">=0.9.0 <0.10.0"
-# TODO(sigmund): uncomment this once we have some easier way to do global
-# app-level transformers or a way to enable this selectively from the
-# application package.
-#transformers:
-#- smoke/src/default_transformer:
-#    # TODO(sigmund): include this once this feature is available in the stable
-#    # channel, or when we really need some other feature in the dev channel.
-#    $include: lib/src/implementation.dart
+# TODO(sigmund): once we have some easier way to do global app-level
+# transformers, we might want to remove this transformer here and only apply it
+# in apps that need it.
+transformers:
+- smoke/src/default_transformer:
+    $include: lib/src/implementation.dart
 dev_dependencies:
   unittest: ">=0.10.0 <0.11.0"
   path: ">=1.0.0 <2.0.0"