Turn DocumentParser::pinToMainThread into a cleaner api

Source/core/html/parser/TextDocumentParser.cpp

 /*
  * 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
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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 #include "config.h"
 #include "core/html/parser/TextDocumentParser.h"
 
 #include "core/HTMLNames.h"
 #include "core/html/parser/HTMLTreeBuilder.h"
+#include "core/html/parser/ParserSynchronizationPolicy.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 TextDocumentParser::TextDocumentParser(HTMLDocument& document)
-    : HTMLDocumentParser(document, false)
+    : HTMLDocumentParser(document, false, AllowAsynchronousParsing)
     , m_haveInsertedFakePreElement(false)
 {
 }
 
 TextDocumentParser::~TextDocumentParser()
 {
 }
 
 void TextDocumentParser::appendBytes(const char* data, size_t length)
 {
@@ skipping 19 matching lines @@
     treeBuilder()->setShouldSkipLeadingNewline(false);
 
     // Although Text Documents expose a "pre" element in their DOM, they
     // act like a <plaintext> tag, so we have to force plaintext mode.
     forcePlaintextForTextDocument();
 
     m_haveInsertedFakePreElement = true;
 }
 
 }