Turn DocumentParser::pinToMainThread into a cleaner api

Source/core/loader/DocumentLoader.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 115 matching lines @@
         void appendRedirect(const KURL&);
 
         PassRefPtr<ContentSecurityPolicy> releaseContentSecurityPolicy() { return m_contentSecurityPolicy.release(); }
 
     protected:
         DocumentLoader(LocalFrame*, const ResourceRequest&, const SubstituteData&);
 
         Vector<KURL> m_redirectChain;
 
     private:
-        static PassRefPtrWillBeRawPtr<DocumentWriter> createWriterFor(const Document* ownerDocument, const DocumentInit&, const AtomicString& mimeType, const AtomicString& encoding, bool dispatch);
+        static PassRefPtrWillBeRawPtr<DocumentWriter> createWriterFor(const Document* ownerDocument, const DocumentInit&, const AtomicString& mimeType, const AtomicString& encoding, bool dispatch, ParserSynchronizationPolicy);
 
         void ensureWriter(const AtomicString& mimeType, const KURL& overridingURL = KURL());
         void endWriting(DocumentWriter*);
 
         Document* document() const;
         FrameLoader* frameLoader() const;
 
         void commitIfReady();
         void commitData(const char* bytes, size_t length);
         void setMainDocumentError(const ResourceError&);
@@ skipping 62 matching lines @@
         double m_timeOfLastDataReceived;
 
         friend class ApplicationCacheHost;  // for substitute resource delivery
         OwnPtrWillBePersistent<ApplicationCacheHost> m_applicationCacheHost;
 
         RefPtr<ContentSecurityPolicy> m_contentSecurityPolicy;
     };
 }
 
 #endif // DocumentLoader_h