Add missing traces for Supplement<> classes

third_party/WebKit/Source/modules/indexeddb/IndexedDBClient.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/indexeddb/IndexedDBClient.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/frame/LocalFrame.h"
 #include "core/workers/WorkerClients.h"
@@ skipping 13 matching lines @@
     WorkerClients* clients = toWorkerGlobalScope(*context).clients();
     ASSERT(clients);
     return static_cast<IndexedDBClient*>(Supplement<WorkerClients>::from(clients, supplementName()));
 }
 
 const char* IndexedDBClient::supplementName()
 {
     return "IndexedDBClient";
 }
 
+DEFINE_TRACE(IndexedDBClient)
+{
+    Supplement<LocalFrame>::trace(visitor);
+    Supplement<WorkerClients>::trace(visitor);
+}
+
 void provideIndexedDBClientTo(LocalFrame& frame, IndexedDBClient* client)
 {
     frame.provideSupplement(IndexedDBClient::supplementName(), client);
 }
 
 void provideIndexedDBClientToWorker(WorkerClients* clients, IndexedDBClient* client)
 {
     clients->provideSupplement(IndexedDBClient::supplementName(), client);
 }
 
 } // namespace blink