Do not re-register cached id-name HTMLCollection at same invalidation type

third_party/WebKit/Source/core/dom/Document.cpp

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index 46adc2123a9414a43b92a94147ada65814bb21ab..4d1fdd4f62d1daab82690a74dff46085778b9698 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -3724,6 +3724,7 @@ void Document::setCSSTarget(Element* newTarget)
 void Document::registerNodeList(const LiveNodeListBase* list)
 {
 #if ENABLE(OILPAN)
+    ASSERT(!m_nodeLists[list->invalidationType()].contains(list));
     m_nodeLists[list->invalidationType()].add(list);
 #else
     m_nodeListCounts[list->invalidationType()]++;