Transformer plugin for polymer. This will make it possible (one day) to use

pkg/polymer/lib/src/build/common.dart

Index: pkg/polymer/lib/src/build/common.dart
diff --git a/pkg/polymer/lib/src/build/common.dart b/pkg/polymer/lib/src/build/common.dart
index fc2acf5ab0164f4a08f4a01c72274f1bd8a9fad9..1ae2a90de1f376984d7741c26ff5cec0b26b6046 100644
--- a/pkg/polymer/lib/src/build/common.dart
+++ b/pkg/polymer/lib/src/build/common.dart
@@ -36,10 +36,9 @@ Document _parseHtml(String contents, String sourcePath, TransformLogger logger,
 
 /** Additional options used by polymer transformers */
 class TransformOptions {
-  String currentPackage;
   List<String> entryPoints;
 
-  TransformOptions([this.currentPackage, entryPoints])
+  TransformOptions([entryPoints])
       : entryPoints = entryPoints == null ? null
           : entryPoints.map(_systemToAssetPath).toList();
 
@@ -48,11 +47,11 @@ class TransformOptions {
     if (id.extension != '.html') return false;
 
     // Note: [id.path] is a relative path from the root of a package.
-    if (currentPackage == null || entryPoints == null) {
+    if (entryPoints == null) {
       return id.path.startsWith('web/') || id.path.startsWith('test/');
     }
 
-    return id.package == currentPackage && entryPoints.contains(id.path);
+    return entryPoints.contains(id.path);
   }
 }
 
@@ -71,11 +70,12 @@ abstract class PolymerTransformer {
 
   Future<Document> readAsHtml(AssetId id, Transform transform) {
     var primaryId = transform.primaryInput.id;
-    var url = (id.package == primaryId.package) ? id.path
+    bool samePackage = id.package == primaryId.package;
+    var url = samePackage ? id.path
         : assetUrlFor(id, primaryId, transform.logger, allowAssetUrl: true);
     return transform.readInputAsString(id).then((content) {
       return _parseHtml(content, url, transform.logger,
-        checkDocType: options.isHtmlEntryPoint(id));
+        checkDocType: samePackage && options.isHtmlEntryPoint(id));
     });
   }