Fix a bug where pub would fail to load a transformer.

sdk/lib/_internal/pub/lib/src/barback/dependency_computer.dart

Index: sdk/lib/_internal/pub/lib/src/barback/dependency_computer.dart
diff --git a/sdk/lib/_internal/pub/lib/src/barback/dependency_computer.dart b/sdk/lib/_internal/pub/lib/src/barback/dependency_computer.dart
index 0105cbfae020728f3fe777fdcb6992d819d94dba..dfca1273ba84209dfda7230ed9b941f619d8d8dd 100644
--- a/sdk/lib/_internal/pub/lib/src/barback/dependency_computer.dart
+++ b/sdk/lib/_internal/pub/lib/src/barback/dependency_computer.dart
@@ -75,7 +75,7 @@ class DependencyComputer {
           return phase.expand((config) {
             var id = config.id;
             if (id.isBuiltInTransformer) return [];
-            if (id.package != _graph.entrypoint.root.name &&
+            if (package.name != _graph.entrypoint.root.name &&
                 !config.canTransformPublicFiles) {
               return [];
             }