Enable MQ evaluation off the main thread

Source/core/html/parser/HTMLDocumentParser.h

 /*
  * Copyright (C) 2010 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 117 matching lines @@
     // HTMLScriptRunnerHost
     virtual void watchForLoad(CachedResource*) OVERRIDE;
     virtual void stopWatchingForLoad(CachedResource*) OVERRIDE;
     virtual HTMLInputStream& inputStream() { return m_input; }
     virtual bool hasPreloadScanner() const { return m_preloadScanner.get() && !shouldUseThreading(); }
     virtual void appendCurrentInputStreamToPreloadScannerAndScan() OVERRIDE;
 
     // CachedResourceClient
     virtual void notifyFinished(CachedResource*);
 
-    void startBackgroundParser();
+    void startBackgroundParser(PassRefPtr<MediaValues>);
     void stopBackgroundParser();
     void validateSpeculations(PassOwnPtr<ParsedChunk> lastChunk);
     void discardSpeculationsAndResumeFrom(PassOwnPtr<ParsedChunk> lastChunk, PassOwnPtr<HTMLToken>, PassOwnPtr<HTMLTokenizer>);
     void processParsedChunkFromBackgroundParser(PassOwnPtr<ParsedChunk>);
     void pumpPendingSpeculations();
 
     Document* contextForParsingSession();
 
     enum SynchronousMode {
         AllowYield,
@@ skipping 47 matching lines @@
 
     bool m_isPinnedToMainThread;
     bool m_endWasDelayed;
     bool m_haveBackgroundParser;
     unsigned m_pumpSessionNestingLevel;
 };
 
 }
 
 #endif