Place "packages" directories inside "tool".

utils/tests/pub/install/pub_install_test.dart

 // Copyright (c) 2012, 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.
 
 library pub_tests;
 
 import 'dart:io';
 
 import '../test_pub.dart';
 import '../../../../pkg/unittest/lib/unittest.dart';
@@ skipping 171 matching lines @@
                 file('foo.dart', 'main() => "foo";')
               ])
             ])
           ])
         ])
       ]).scheduleValidate();
 
       run();
     });
 
+    test('"tool/" and its subdirectories', () {
+      dir(appPath, [
+        appPubspec([]),
+        libDir('foo'),
+        dir("tool", [dir("subtool")])
+      ]).scheduleCreate();
+
+      schedulePub(args: ['install'],
+          output: new RegExp(r"Dependencies installed!$"));
+
+      dir(appPath, [
+        dir("tool", [
+          dir("packages", [
+            dir("myapp", [
+              file('foo.dart', 'main() => "foo";')
+            ])
+          ]),
+          dir("subtool", [
+            dir("packages", [
+              dir("myapp", [
+                file('foo.dart', 'main() => "foo";')
+              ])
+            ])
+          ])
+        ])
+      ]).scheduleValidate();
+
+      run();
+    });
+
     test('"web/" and its subdirectories', () {
       dir(appPath, [
         appPubspec([]),
         libDir('foo'),
         dir("web", [dir("subweb")])
       ]).scheduleCreate();
 
       schedulePub(args: ['install'],
           output: new RegExp(r"Dependencies installed!$"));
 
@@ skipping 53 matching lines @@
     schedulePub(args: ['install'],
         error: '''
         Warning: Package "myapp_name" is using a deprecated layout.
         See http://www.dartlang.org/docs/pub-package-manager/package-layout.html for details.
         ''',
         output: new RegExp(r"Dependencies installed!$"));
 
     run();
   });
 }