Store the async-await compiled pub code directly in the repo.

sdk/lib/_internal/pub_generated/test/transformer/does_not_run_a_transform_on_an_input_in_another_package_test.dart

+library pub_tests;
+import '../descriptor.dart' as d;
+import '../test_pub.dart';
+import '../serve/utils.dart';
+main() {
+  initConfig();
+  withBarbackVersions("any", () {
+    integration("does not run a transform on an input in another package", () {
+      d.dir("foo", [d.pubspec({
+          "name": "foo",
+          "version": "0.0.1",
+          "transformers": ["foo/transformer"]
+        }),
+            d.dir(
+                "lib",
+                [
+                    d.file("transformer.dart", REWRITE_TRANSFORMER),
+                    d.file("foo.txt", "foo")])]).create();
+      d.dir(appPath, [d.appPubspec({
+          "foo": {
+            "path": "../foo"
+          }
+        }), d.dir("lib", [d.file("bar.txt", "bar")])]).create();
+      createLockFile('myapp', sandbox: ['foo'], pkg: ['barback']);
+      pubServe();
+      requestShould404("packages/myapp/bar.out");
+      endPubServe();
+    });
+  });
+}