[wrapper-tracing] Enable cleanup and invalidating on WorkerBackingThread

third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp

Index: third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
diff --git a/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp b/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
index 3f79258bcb29de8bf74128bf6f05d0cefe2d5daf..23cf3ff269289c3f525af6eed60bf5b304fee5ff 100644
--- a/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
+++ b/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
@@ -73,7 +73,9 @@ void WorkerBackingThread::initialize() {
       WTF::makeUnique<V8IsolateInterruptor>(m_isolate);
   ThreadState::current()->addInterruptor(std::move(interruptor));
   ThreadState::current()->registerTraceDOMWrappers(
-      m_isolate, V8GCController::traceDOMWrappers, nullptr, nullptr);
+      m_isolate, V8GCController::traceDOMWrappers,
+      ScriptWrappableVisitor::invalidateDeadObjectsInMarkingDeque,
+      ScriptWrappableVisitor::performCleanup);
   if (RuntimeEnabledFeatures::v8IdleTasksEnabled())
     V8PerIsolateData::enableIdleTasks(
         m_isolate, WTF::wrapUnique(new V8IdleTaskRunner(