LibWeb/IDB: Add internal Index object

Author: https://github.com/stelar7
Commit: 9321ad04c0
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4178
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/AtkinsSJ

Libraries/LibWeb/IndexedDB/Internal/ObjectStore.h

@@ -15,6 +15,7 @@
 #include <LibJS/Runtime/Realm.h>
 #include <LibWeb/IndexedDB/Internal/Algorithms.h>
 #include <LibWeb/IndexedDB/Internal/Database.h>
+#include <LibWeb/IndexedDB/Internal/Index.h>
 #include <LibWeb/IndexedDB/Internal/KeyGenerator.h>
 
 namespace Web::IndexedDB {
@@ -39,6 +40,9 @@ public:
 
     GC::Ref<Database> database() const { return m_database; }
 
+    void add_index(GC::Ref<Index> index) { m_indexes.append(index); }
+    ReadonlySpan<GC::Ref<Index>> index_set() const { return m_indexes; }
+
 protected:
     virtual void visit_edges(Visitor&) override;
 
@@ -48,6 +52,9 @@ private:
     // AD-HOC: An ObjectStore needs to know what Database it belongs to...
     GC::Ref<Database> m_database;
 
+    // AD-HOC: An Index has referenced ObjectStores, we also need the reverse mapping
+    Vector<GC::Ref<Index>> m_indexes;
+
     // An object store has a name, which is a name. At any one time, the name is unique within the database to which it belongs.
     String m_name;