[wrapper-tracing] Add NodeList write barriers

third_party/WebKit/Source/core/dom/NodeRareData.h

Index: third_party/WebKit/Source/core/dom/NodeRareData.h
diff --git a/third_party/WebKit/Source/core/dom/NodeRareData.h b/third_party/WebKit/Source/core/dom/NodeRareData.h
index 4fa5f347f7bcec4b5b57a4d66941669f7a16a254..8f4e005d665f9ac0c2facd9c9735bece746d159b 100644
--- a/third_party/WebKit/Source/core/dom/NodeRareData.h
+++ b/third_party/WebKit/Source/core/dom/NodeRareData.h
@@ -76,8 +76,10 @@ class NodeRareData : public GarbageCollectedFinalized<NodeRareData>,
   // initialized m_nodeLists is cleared by NodeRareData::traceAfterDispatch().
   NodeListsNodeData& ensureNodeLists() {
     DCHECK(ThreadState::current()->isGCForbidden());
-    if (!m_nodeLists)
+    if (!m_nodeLists) {
       m_nodeLists = NodeListsNodeData::create();
+      ScriptWrappableVisitor::writeBarrier(this, m_nodeLists);
+    }
     return *m_nodeLists;
   }