Let V8 know about the external memory owned by large StaticNodeList

Source/core/dom/StaticNodeList.cpp

Index: Source/core/dom/StaticNodeList.cpp
diff --git a/Source/core/dom/StaticNodeList.cpp b/Source/core/dom/StaticNodeList.cpp
index d9bf28e1f5b79c2b34f86d8b8b2268616c95d605..ba3cfb3eb59ca0bb56a532997f9c2acc15a33b53 100644
--- a/Source/core/dom/StaticNodeList.cpp
+++ b/Source/core/dom/StaticNodeList.cpp
@@ -33,6 +33,21 @@
 
 namespace WebCore {
 
+PassRefPtr<StaticNodeList> StaticNodeList::adopt(Vector<RefPtr<Node> >& nodes)
+{
+    RefPtr<StaticNodeList> nodeList = adoptRef(new StaticNodeList);
+    nodeList->m_nodes.swap(nodes);
+    if (nodeList->AllocationSize() > externalMemoryReportSizeLimit)
+        v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(nodeList->AllocationSize());
+    return nodeList.release();
+}
+
+StaticNodeList::~StaticNodeList()
+{
+    if (AllocationSize() > externalMemoryReportSizeLimit)
+        v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(-AllocationSize());
+}
+
 unsigned StaticNodeList::length() const
 {
     return m_nodes.size();