[ios] Fix users cannot select folder in document picker

Allow users to select folder in document picker when developers call `window.showDirectoryPicker()` from JavaScript side

Bug: 1411704
Change-Id: I63ae14a7f233a7083d91b4e5b77e1808ac620f19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5891832
Reviewed-by: Dave Tapuska <[email protected]>
Reviewed-by: Avi Drissman <[email protected]>
Commit-Queue: Xiaobin Cui <[email protected]>
Reviewed-by: Julie Jeongeun Kim <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1361497}

file-system-access/local_FileSystemFileHandle-create-sync-access-handle-manual.https.tentative.html

@@ -7,5 +7,5 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="resources/test-helpers.js"></script>
 <script src="resources/local-fs-test-helpers.js"></script>
-<script src="resources/messaging-helpers.js"></script>
+<script src="../fs/resources/messaging-helpers.js"></script>
 <script src="../fs/script-tests/FileSystemFileHandle-create-sync-access-handle.js"></script>

file-system-access/resources/test-helpers.js

@@ -61,3 +61,26 @@ async function createFileWithContents(name, contents, parent) {
   await writer.close();
   return handle;
 }
+
+async function cleanup(test, value, cleanup_func) {
+  test.add_cleanup(async () => {
+    try {
+      await cleanup_func();
+    } catch (e) {
+      // Ignore any errors when removing files, as tests might already remove
+      // the file.
+    }
+  });
+  return value;
+}
+
+async function cleanup_writable(test, value) {
+  return cleanup(test, value, async () => {
+    try {
+      await value.close();
+    } catch (e) {
+      // Ignore any errors when closing writables, since attempting to close
+      // aborted or closed writables will error.
+    }
+  });
+}