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

sdk/lib/_internal/pub_generated/test/build/can_specify_output_directory_test.dart

Index: sdk/lib/_internal/pub_generated/test/build/can_specify_output_directory_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/build/can_specify_output_directory_test.dart b/sdk/lib/_internal/pub_generated/test/build/can_specify_output_directory_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..2aa08f4745beff8708e64fcbe5a94d12f9515658
--- /dev/null
+++ b/sdk/lib/_internal/pub_generated/test/build/can_specify_output_directory_test.dart
@@ -0,0 +1,23 @@
+library pub_tests;
+import 'package:path/path.dart' as path;
+import 'package:scheduled_test/scheduled_test.dart';
+import '../descriptor.dart' as d;
+import '../test_pub.dart';
+main() {
+  initConfig();
+  integration("can specify the output directory to build into", () {
+    d.dir(
+        appPath,
+        [d.appPubspec(), d.dir('web', [d.file('file.txt', 'web')])]).create();
+    var outDir = path.join("out", "dir");
+    schedulePub(
+        args: ["build", "-o", outDir],
+        output: contains('Built 1 file to "$outDir".'));
+    d.dir(
+        appPath,
+        [
+            d.dir(
+                "out",
+                [d.dir("dir", [d.dir("web", [d.file("file.txt", "web")])])])]).validate();
+  });
+}