Add packages/ directories for dart files in web/.

utils/tests/pub/pub_install_test.dart

Index: utils/tests/pub/pub_install_test.dart
diff --git a/utils/tests/pub/pub_install_test.dart b/utils/tests/pub/pub_install_test.dart
index 01f192ae57e385bec93173a67bc618d84e25c1c8..8f938be5dba7d63b6dfa78c369d6e4c453a08033 100644
--- a/utils/tests/pub/pub_install_test.dart
+++ b/utils/tests/pub/pub_install_test.dart
@@ -154,6 +154,36 @@ main() {
       run();
     });
 
+    test('"web/" and its subdirectories', () {
+      dir(appPath, [
+        appPubspec([]),
+        libDir('foo'),
+        dir("web", [dir("subweb")])
+      ]).scheduleCreate();
+
+      schedulePub(args: ['install'],
+          output: const RegExp(@"Dependencies installed!$"));
+
+      dir(appPath, [
+        dir("web", [
+          dir("packages", [
+            dir("myapp", [
+              file('foo.dart', 'main() => "foo";')
+            ])
+          ]),
+          dir("subweb", [
+            dir("packages", [
+              dir("myapp", [
+                file('foo.dart', 'main() => "foo";')
+              ])
+            ])
+          ])
+        ])
+      ]).scheduleValidate();
+
+      run();
+    });
+
     test('"bin/"', () {
       dir(appPath, [
         appPubspec([]),