Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/global/activate/installs_dependencies_for_path_test.dart

-// Copyright (c) 2014, 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 'package:scheduled_test/scheduled_stream.dart';
-
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-
-main() {
-  initConfig();
-  integration('activating a path package installs dependencies', () {
-    servePackages((builder) {
-      builder.serve("bar", "1.0.0", deps: {"baz": "any"});
-      builder.serve("baz", "2.0.0");
-    });
-
-    d.dir("foo", [
-      d.libPubspec("foo", "0.0.0", deps: {
-        "bar": "any"
-      }),
-      d.dir("bin", [
-        d.file("foo.dart", "main() => print('ok');")
-      ])
-    ]).create();
-
-    var pub = startPub(args: ["global", "activate", "-spath", "../foo"]);
-    pub.stdout.expect(consumeThrough("Resolving dependencies..."));
-    pub.stdout.expect(consumeThrough("Downloading bar 1.0.0..."));
-    pub.stdout.expect(consumeThrough("Downloading baz 2.0.0..."));
-    pub.stdout.expect(consumeThrough(
-        startsWith("Activated foo 0.0.0 at path")));
-    pub.shouldExit();
-
-    // Puts the lockfile in the linked package itself.
-    d.dir("foo", [
-      d.matcherFile("pubspec.lock", allOf([
-        contains("bar"), contains("1.0.0"),
-        contains("baz"), contains("2.0.0")
-      ]))
-    ]).validate();
-  });
-}