Track parse time blocked on script in xml documents.

third_party/WebKit/Source/core/xml/parser/XMLDocumentParser.h

 /*
  * Copyright (C) 2000 Peter Kelly (pmk@post.com)
  * Copyright (C) 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 170 matching lines @@
     bool m_isXHTMLDocument;
     bool m_parserPaused;
     bool m_requestingScript;
     bool m_finishCalled;
 
     XMLErrors m_xmlErrors;
 
     Member<ScriptResource> m_pendingScript;
     Member<Element> m_scriptElement;
     TextPosition m_scriptStartPosition;
+    double m_parserBlockingPendingScriptLoadStartTime;
 
     bool m_parsingFragment;
     AtomicString m_defaultNamespaceURI;
 
     typedef HashMap<AtomicString, AtomicString> PrefixForNamespaceMap;
     PrefixForNamespaceMap m_prefixToNamespaceMap;
     SegmentedString m_pendingSrc;
 };
 
 xmlDocPtr xmlDocPtrForString(Document*, const String& source, const String& url);
 HashMap<String, String> parseAttributes(const String&, bool& attrsOK);
 
 } // namespace blink
 
 #endif // XMLDocumentParser_h