LibWeb/IDB: Implement IDBFactory::databases()

Author: https://github.com/stelar7
Commit: 664c57af16
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3923
Reviewed-by: https://github.com/gmta ✅
Reviewed-by: https://github.com/shannonbooth

Libraries/LibWeb/IndexedDB/Internal/Database.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2024, stelar7 <dudedbz@gmail.com>
+ * Copyright (c) 2024-2025, stelar7 <dudedbz@gmail.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -28,6 +28,16 @@ void Database::visit_edges(Visitor& visitor)
     visitor.visit(m_upgrade_transaction);
 }
 
+Vector<GC::Root<Database>> Database::for_key(StorageAPI::StorageKey const& key)
+{
+    Vector<GC::Root<Database>> databases;
+    for (auto const& database_mapping : m_databases.get(key).value_or({})) {
+        databases.append(database_mapping.value);
+    }
+
+    return databases;
+}
+
 RequestList& ConnectionQueueHandler::for_key_and_name(StorageAPI::StorageKey& key, String& name)
 {
     return ConnectionQueueHandler::the().m_open_requests.ensure(key, [] {