Fix polymer tests and a couple bugs

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

Index: pkg/polymer/lib/src/build/import_inliner.dart
diff --git a/pkg/polymer/lib/src/build/import_inliner.dart b/pkg/polymer/lib/src/build/import_inliner.dart
index f7bf7eae158f15b9213425190e49a5e818357ad2..abaa27505a29a48c2b811d277dbfc54dd150c176 100644
--- a/pkg/polymer/lib/src/build/import_inliner.dart
+++ b/pkg/polymer/lib/src/build/import_inliner.dart
@@ -318,7 +318,8 @@ class _UrlNormalizer extends TreeVisitor {
         var uri = directive.uri.stringValue;
         var span = _getSpan(file, directive.uri);
 
-        var id = resolve(sourceId, uri, transform.logger, span);
+        var id = resolve(sourceId, uri, transform.logger, span,
+            allowAbsolute: true);
         if (id == null) continue;
 
         var primaryId = transform.primaryInput.id;