Revert of Revert "Moved text decoding to the parser thread"

Source/core/html/parser/TextResourceDecoder.h

 /*
     Copyright (C) 1999 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
     Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
 
@@ skipping 10 matching lines @@
 */
 
 #ifndef TextResourceDecoder_h
 #define TextResourceDecoder_h
 
 #include "wtf/RefCounted.h"
 #include "wtf/text/TextEncoding.h"
 
 namespace WebCore {
 
+class DocumentEncodingData;
 class HTMLMetaCharsetParser;
 
 class TextResourceDecoder {
 public:
     enum EncodingSource {
         DefaultEncoding,
         AutoDetectedEncoding,
         EncodingFromContentSniffing,
         EncodingFromXMLHeader,
         EncodingFromMetaTag,
@@ skipping 24 matching lines @@
     {
         m_hintEncoding = encoding.name();
     }
 
     void useLenientXMLDecoding() { m_useLenientXMLDecoding = true; }
     bool sawError() const { return m_sawError; }
 
 private:
     TextResourceDecoder(const String& mimeType, const WTF::TextEncoding& defaultEncoding, bool usesEncodingDetector);
 
-    enum ContentType { PlainText, HTML, XML, CSS }; // PlainText only checks for BOM.
+    enum ContentType { PlainTextContent, HTMLContent, XMLContent, CSSContent }; // PlainText only checks for BOM.
     static ContentType determineContentType(const String& mimeType);
     static const WTF::TextEncoding& defaultEncoding(ContentType, const WTF::TextEncoding& defaultEncoding);
 
     size_t checkForBOM(const char*, size_t);
     bool checkForCSSCharset(const char*, size_t, bool& movedDataToBuffer);
     bool checkForXMLCharset(const char*, size_t, bool& movedDataToBuffer);
     void checkForMetaCharset(const char*, size_t);
     void detectJapaneseEncoding(const char*, size_t);
     bool shouldAutoDetect() const;
 
@@ skipping 10 matching lines @@
     bool m_useLenientXMLDecoding; // Don't stop on XML decoding errors.
     bool m_sawError;
     bool m_usesEncodingDetector;
 
     OwnPtr<HTMLMetaCharsetParser> m_charsetParser;
 };
 
 }
 
 #endif