Run HTMLSourceTracker hooks only when XSSAuditor is enabled

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 205 matching lines @@
 
 void BackgroundHTMLParser::pumpTokenizer()
 {
     HTMLTreeBuilderSimulator::SimulatedToken simulatedToken = HTMLTreeBuilderSimulator::OtherToken;
 
     // No need to start speculating until the main thread has almost caught up.
     if (m_input.totalCheckpointTokenCount() > m_outstandingTokenLimit)
         return;
 
     while (true) {
-        m_sourceTracker.start(m_input.current(), m_tokenizer.get(), *m_token);
+        if (m_xssAuditor->isEnabled())
+            m_sourceTracker.start(m_input.current(), m_tokenizer.get(), *m_token);
+
         if (!m_tokenizer->nextToken(m_input.current(), *m_token)) {
             // We've reached the end of our current input.
             sendTokensToMainThread();
             break;
         }
-        m_sourceTracker.end(m_input.current(), m_tokenizer.get(), *m_token);
+
+        if (m_xssAuditor->isEnabled())
+            m_sourceTracker.end(m_input.current(), m_tokenizer.get(), *m_token);
 
         {
             TextPosition position = TextPosition(m_input.current().currentLine(), m_input.current().currentColumn());
 
             if (OwnPtr<XSSInfo> xssInfo = m_xssAuditor->filterToken(FilterTokenRequest(*m_token, m_sourceTracker, m_tokenizer->shouldAllowCDATA()))) {
                 xssInfo->m_textPosition = position;
                 m_pendingXSSInfos.append(xssInfo.release());
             }
 
-            CompactHTMLToken token(m_token.get(), TextPosition(m_input.current().currentLine(), m_input.current().currentColumn()));
+            CompactHTMLToken token(m_token.get(), position);
 
             m_preloadScanner->scan(token, m_input.current(), m_pendingPreloads);
             simulatedToken = m_treeBuilderSimulator.simulate(token, m_tokenizer.get());
 
             // Break chunks before a script tag is inserted and flag the chunk as starting a script
             // so the main parser can decide if it should yield before processing the chunk.
             if (simulatedToken == HTMLTreeBuilderSimulator::ScriptStart) {
                 sendTokensToMainThread();
                 m_startingScript = true;
             }
@@ skipping 35 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);
 }
 
 }