bindings: Supports reentrance to ScriptWrappable::wrap through V8DOMWrapper::createWrapper.

Source/core/dom/Node.cpp

Index: Source/core/dom/Node.cpp
diff --git a/Source/core/dom/Node.cpp b/Source/core/dom/Node.cpp
index c1a6aae93108c806125dc9b2725e7b48ed6e6b92..2b4c35fdb3ccd87f6eaeee36acc75a313bec8941 100644
--- a/Source/core/dom/Node.cpp
+++ b/Source/core/dom/Node.cpp
@@ -2425,6 +2425,12 @@ v8::Local<v8::Object> Node::wrap(v8::Isolate* isolate, v8::Local<v8::Object> cre
     const WrapperTypeInfo* wrapperType = wrapperTypeInfo();
 
     v8::Local<v8::Object> wrapper = V8DOMWrapper::createWrapper(isolate, creationContext, wrapperType, this);
+    // V8DOMWrapper::createWrapper may run an arbitrary script and it may result
+    // in creating a new wrapper and associating it with |this|.  If so, the
+    // wrapper already created and associated must be used.
+    v8::Local<v8::Object> associatedWrapper = DOMDataStore::getWrapper(this, isolate);
+    if (UNLIKELY(!associatedWrapper.IsEmpty()))
+        return associatedWrapper;
     if (UNLIKELY(wrapper.IsEmpty()))
         return wrapper;