Fix race between updatedocument and sendTokensToMainThread

Source/core/html/parser/BackgroundHTMLParser.cpp

 /*
  * Copyright (C) 2013 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 139 matching lines @@
 }
 
 void BackgroundHTMLParser::updateDocument(const String& decodedData)
 {
     DocumentEncodingData encodingData(*m_decoder.get());
 
     if (encodingData != m_lastSeenEncodingData) {
         m_lastSeenEncodingData = encodingData;
 
         m_xssAuditor->setEncoding(encodingData.encoding());
-        Platform::current()->mainThread()->postTask(FROM_HERE, threadSafeBind(&HTMLDocumentParser::didReceiveEncodingDataFromBackgroundParser, AllowCrossThreadAccess(m_parser), encodingData));
+        m_scheduler->postLoadingTask(
+            FROM_HERE,
+            new Task(threadSafeBind(&HTMLDocumentParser::didReceiveEncodingDataFromBackgroundParser, AllowCrossThreadAccess(m_parser), encodingData)));
     }
 
     if (decodedData.isEmpty())
         return;
 
     appendDecodedBytes(decodedData);
 }
 
 void BackgroundHTMLParser::resumeFrom(PassOwnPtr<Checkpoint> checkpoint)
 {
@@ skipping 115 matching lines @@
     m_startingScript = false;
 
     m_scheduler->postLoadingTask(
         FROM_HERE,
         new Task(threadSafeBind(&HTMLDocumentParser::didReceiveParsedChunkFromBackgroundParser, AllowCrossThreadAccess(m_parser), chunk.release())));
 
     m_pendingTokens = adoptPtr(new CompactHTMLTokenStream);
 }
 
 }