Place "packages" directories inside "tool".

utils/tests/pub/install/pub_install_test.dart

Index: utils/tests/pub/install/pub_install_test.dart
diff --git a/utils/tests/pub/install/pub_install_test.dart b/utils/tests/pub/install/pub_install_test.dart
index e06e4fc539ce9f8514a8a506b3d82867adacc254..1ce3a6a0bf23091aaedf3ae823bada1bf95cd77d 100644
--- a/utils/tests/pub/install/pub_install_test.dart
+++ b/utils/tests/pub/install/pub_install_test.dart
@@ -189,6 +189,36 @@ main() {
       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([]),