Revert "Use native async/await support in pub."

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

Index: sdk/lib/_internal/pub_generated/test/build/includes_dart_files_from_dependencies_in_debug_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/build/includes_dart_files_from_dependencies_in_debug_test.dart b/sdk/lib/_internal/pub_generated/test/build/includes_dart_files_from_dependencies_in_debug_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..a1dff8ae3a64d1a38d6df84055d82944cd977f01
--- /dev/null
+++ b/sdk/lib/_internal/pub_generated/test/build/includes_dart_files_from_dependencies_in_debug_test.dart
@@ -0,0 +1,70 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:scheduled_test/scheduled_test.dart';
+
+import '../descriptor.dart' as d;
+import '../test_pub.dart';
+
+main() {
+  initConfig();
+
+  integration("includes .dart files from dependencies in debug mode", () {
+    // Dart2js can take a long time to compile dart code, so we increase the
+    // timeout to cope with that.
+    currentSchedule.timeout *= 3;
+
+    d.dir(
+        "foo",
+        [
+            d.libPubspec("foo", "0.0.1"),
+            d.dir(
+                "lib",
+                [
+                    d.file('foo.dart', 'foo() => print("hello");'),
+                    d.dir("sub", [d.file('bar.dart', 'bar() => print("hello");'),])])]).create();
+
+    d.dir(appPath, [d.appPubspec({
+        "foo": {
+          "path": "../foo"
+        }
+      }),
+          d.dir(
+              "example",
+              [
+                  d.file("main.dart", 'myapp() => print("not entrypoint");'),
+                  d.dir(
+                      "sub",
+                      [d.file("main.dart", 'myapp() => print("not entrypoint");')])])]).create();
+
+    schedulePub(
+        args: ["build", "--mode", "debug", "example"],
+        output: new RegExp(r'Built \d+ files to "build".'));
+
+    d.dir(
+        appPath,
+        [
+            d.dir(
+                'build',
+                [
+                    d.dir(
+                        'example',
+                        [
+                            d.file("main.dart", 'myapp() => print("not entrypoint");'),
+                            d.dir(
+                                'packages',
+                                [
+                                    d.dir(
+                                        'foo',
+                                        [
+                                            d.file('foo.dart', 'foo() => print("hello");'),
+                                            d.dir("sub", [d.file('bar.dart', 'bar() => print("hello");'),])])]),
+                            d.dir(
+                                "sub",
+                                [
+                                    d.file("main.dart", 'myapp() => print("not entrypoint");'),
+                                    // Does *not* copy packages into subdirectories.
+            d.nothing("packages")])])])]).validate();
+  });
+}