LibWeb/IDB: Implement IDBTransaction::commit

Author: https://github.com/stelar7
Commit: da56c1b1eb
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4306
Reviewed-by: https://github.com/ADKaster ✅

Libraries/LibWeb/IndexedDB/IDBTransaction.cpp

@@ -103,4 +103,19 @@ GC::Ref<HTML::DOMStringList> IDBTransaction::object_store_names()
     return create_a_sorted_name_list(realm(), names);
 }
 
+// https://w3c.github.io/IndexedDB/#dom-idbtransaction-commit
+WebIDL::ExceptionOr<void> IDBTransaction::commit()
+{
+    auto& realm = this->realm();
+
+    // 1. If this's state is not active, then throw an "InvalidStateError" DOMException.
+    if (m_state != TransactionState::Active)
+        return WebIDL::InvalidStateError::create(realm, "Transaction is not active while commiting"_string);
+
+    // 2. Run commit a transaction with this.
+    commit_a_transaction(realm, *this);
+
+    return {};
+}
+
 }