Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/build/includes_dart_files_in_debug_mode_test.dart

-// 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 in debug mode", () {
-    d.dir(appPath, [
-      d.appPubspec(),
-      d.dir('web', [
-        d.file('file1.dart', 'var main = () => print("hello");'),
-        d.file('file2.dart', 'void main(arg1, arg2, arg3) => print("hello");'),
-        d.file('file3.dart', 'class Foo { void main() => print("hello"); }'),
-        d.file('file4.dart', 'var foo;')
-      ])
-    ]).create();
-
-    schedulePub(args: ["build", "--mode", "debug"],
-        output: new RegExp(r'Built \d+ files to "build".'));
-
-    d.dir(appPath, [
-      d.dir('build', [
-        d.dir('web', [
-          d.nothing('file1.dart.js'),
-          d.matcherFile('file1.dart', isNot(isEmpty)),
-          d.nothing('file2.dart.js'),
-          d.matcherFile('file2.dart', isNot(isEmpty)),
-          d.nothing('file3.dart.js'),
-          d.matcherFile('file3.dart', isNot(isEmpty)),
-          d.nothing('file4.dart.js'),
-          d.matcherFile('file4.dart', isNot(isEmpty))
-        ])
-      ])
-    ]).validate();
-  });
-}