Use precompiled dependencies in pub.

sdk/lib/_internal/pub_generated/lib/src/barback/load_all_transformers.dart

Index: sdk/lib/_internal/pub_generated/lib/src/barback/load_all_transformers.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/barback/load_all_transformers.dart b/sdk/lib/_internal/pub_generated/lib/src/barback/load_all_transformers.dart
index 4868e845ba248ca4b1601eeee811c92bc02e40ad..effda1064dc6e45508944d03bd139bc7bb6b6004 100644
--- a/sdk/lib/_internal/pub_generated/lib/src/barback/load_all_transformers.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/barback/load_all_transformers.dart
@@ -16,9 +16,7 @@ Future loadAllTransformers(AssetEnvironment environment,
   scheduleMicrotask(() {
     try {
       var transformersNeededByTransformers =
-          computeTransformersNeededByTransformers(
-              environment.graph,
-              packages: environment.packages);
+          computeTransformersNeededByTransformers(environment.graph);
       var buffer = new StringBuffer();
       buffer.writeln("Transformer dependencies:");
       transformersNeededByTransformers.forEach(((id, dependencies) {
@@ -32,10 +30,10 @@ Future loadAllTransformers(AssetEnvironment environment,
       var stagedTransformers =
           _stageTransformers(transformersNeededByTransformers);
       var packagesThatUseTransformers =
-          _packagesThatUseTransformers(environment.graph);
+          _packagesThatUseTransformers(environment);
       var loader = new TransformerLoader(environment, transformerServer);
       var rewrite = new RewriteImportTransformer();
-      var it0 = environment.packages.iterator;
+      var it0 = environment.graph.packages.keys.iterator;
       break0(x9) {
         environment.barback.updateTransformers(r'$pub', [[rewrite]]);
         join0(x0) {
@@ -204,10 +202,10 @@ List<Set<TransformerId>> _stageTransformers(Map<TransformerId,
   }
   return stages;
 }
-Map<TransformerId, Set<String>> _packagesThatUseTransformers(PackageGraph graph)
-    {
+Map<TransformerId, Set<String>>
+    _packagesThatUseTransformers(AssetEnvironment environment) {
   var results = {};
-  for (var package in graph.packages.values) {
+  for (var package in environment.graph.packages.values) {
     for (var phase in package.pubspec.transformers) {
       for (var config in phase) {
         results.putIfAbsent(config.id, () => new Set()).add(package.name);