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

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 5638 matching lines @@
     const WrapperTypeInfo* wrapperType = wrapperTypeInfo();
 
     if (frame() && frame()->script().initializeMainWorld()) {
         // initializeMainWorld may have created a wrapper for the object, retry from the start.
         v8::Local<v8::Object> wrapper = DOMDataStore::getWrapper(this, isolate);
         if (!wrapper.IsEmpty())
             return wrapper;
     }
 
     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;
 
     wrapperType->installConditionallyEnabledProperties(wrapper, isolate);
     return associateWithWrapper(isolate, wrapperType, wrapper);
 }
 
 v8::Local<v8::Object> Document::associateWithWrapper(v8::Isolate* isolate, const WrapperTypeInfo* wrapperType, v8::Local<v8::Object> wrapper)
 {
     V8DOMWrapper::associateObjectWithWrapper(isolate, this, wrapperType, wrapper);
@@ skipping 101 matching lines @@
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().string().utf8().data());
 }
 #endif