[wrapper-tracing] XMLHttpRequest: Add write barriers

third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp

 /*
  *  Copyright (C) 2004, 2006, 2008 Apple Inc. All rights reserved.
  *  Copyright (C) 2005-2007 Alexey Proskuryakov <ap@webkit.org>
  *  Copyright (C) 2007, 2008 Julien Chaffraix <jchaffraix@webkit.org>
  *  Copyright (C) 2008, 2011 Google Inc. All rights reserved.
  *  Copyright (C) 2012 Intel Corporation
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
@@ skipping 209 matching lines @@
 
   return xmlHttpRequest;
 }
 
 XMLHttpRequest::XMLHttpRequest(
     ExecutionContext* context,
     PassRefPtr<SecurityOrigin> isolatedWorldSecurityOrigin)
     : ActiveScriptWrappable(this),
       ActiveDOMObject(context),
       m_timeoutMilliseconds(0),
+      m_responseBlob(this, nullptr),
+      m_responseLegacyStream(this, nullptr),
       m_state(kUnsent),
+      m_responseDocument(this, nullptr),
       m_lengthDownloadedToFile(0),
+      m_responseArrayBuffer(this, nullptr),
       m_receivedLength(0),
       m_exceptionCode(0),
       m_progressEventThrottle(
           XMLHttpRequestProgressEventThrottle::create(this)),
       m_responseTypeCode(ResponseTypeDefault),
       m_isolatedWorldSecurityOrigin(isolatedWorldSecurityOrigin),
       m_eventDispatchRecursionLevel(0),
       m_async(true),
       m_includeCredentials(false),
       m_parsedResponse(false),
@@ skipping 1629 matching lines @@
   visitor->traceWrappers(m_responseDocument);
   visitor->traceWrappers(m_responseArrayBuffer);
   XMLHttpRequestEventTarget::traceWrappers(visitor);
 }
 
 std::ostream& operator<<(std::ostream& ostream, const XMLHttpRequest* xhr) {
   return ostream << "XMLHttpRequest " << static_cast<const void*>(xhr);
 }
 
 }  // namespace blink