Switch polymer's build.dart to use the new linter. This CL does the following

pkg/polymer/lib/src/transform/script_compactor.dart

Index: pkg/polymer/lib/src/transform/script_compactor.dart
diff --git a/pkg/polymer/lib/src/transform/script_compactor.dart b/pkg/polymer/lib/src/transform/script_compactor.dart
index c247f2dc233caa8903dd61cc95de9dd24212b012..21be308385875fcd9f716fc80224cacada4cf585 100644
--- a/pkg/polymer/lib/src/transform/script_compactor.dart
+++ b/pkg/polymer/lib/src/transform/script_compactor.dart
@@ -27,10 +27,14 @@ import 'common.dart';
  * invoke the main method on each of these libraries and register any polymer
  * elements annotated with `@CustomTag`.
  */
-class ScriptCompactor extends Transformer {
+class ScriptCompactor extends Transformer with PolymerTransformer {
+  final TransformOptions options;
+
+  ScriptCompactor(this.options);
+
   /** Only run on entry point .html files. */
   Future<bool> isPrimary(Asset input) =>
-      new Future.value(isPrimaryHtml(input.id));
+      new Future.value(options.isHtmlEntrypoint(input.id));
 
   Future apply(Transform transform) {
     var id = transform.primaryInput.id;