LibWeb: Implement the DataTransferItem kind and type attributes

Author: https://github.com/trflynn89
Commit: 001d8384e5
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/1158
Reviewed-by: https://github.com/shannonbooth

Userland/Libraries/LibWeb/HTML/DataTransfer.cpp

@@ -266,6 +266,14 @@ JS::NonnullGCPtr<DataTransferItem> DataTransfer::item(size_t index) const
     return m_item_list[index];
 }
 
+DragDataStoreItem const& DataTransfer::drag_data(size_t index) const
+{
+    VERIFY(m_associated_drag_data_store);
+    VERIFY(index < m_item_list.size());
+
+    return m_associated_drag_data_store->item_list()[index];
+}
+
 size_t DataTransfer::length() const
 {
     if (m_associated_drag_data_store)