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

Source/core/html/parser/HTMLParserIdioms.h

 /*
  * Copyright (C) 2010 Apple 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 12 matching lines @@
  */
 
 #ifndef HTMLParserIdioms_h
 #define HTMLParserIdioms_h
 
 #include "core/dom/QualifiedName.h"
 #include "platform/Decimal.h"
 #include "wtf/Forward.h"
 #include "wtf/text/WTFString.h"
 
+namespace WTF {
+class TextEncoding;
+}
+
 namespace WebCore {
 
 // Space characters as defined by the HTML specification.
 bool isHTMLSpace(UChar);
 bool isHTMLLineBreak(UChar);
 bool isNotHTMLSpace(UChar);
 
 // Strip leading and trailing whitespace as defined by the HTML specification.
 String stripLeadingAndTrailingHTMLSpaces(const String&);
 template<size_t inlineCapacity>
@@ skipping 11 matching lines @@
 // The double* parameter may be 0 to check if the string can be parsed without getting the result.
 Decimal parseToDecimalForNumberType(const String&, const Decimal& fallbackValue = Decimal::nan());
 double parseToDoubleForNumberType(const String&, double fallbackValue = std::numeric_limits<double>::quiet_NaN());
 
 // http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-integers
 bool parseHTMLInteger(const String&, int&);
 
 // http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-non-negative-integers
 bool parseHTMLNonNegativeInteger(const String&, unsigned int&);
 
+typedef Vector<pair<String, String> > HTMLAttributeList;
+// The returned encoding might not be valid.
+WTF::TextEncoding encodingFromMetaAttributes(const HTMLAttributeList&);
+
 // Inline implementations of some of the functions declared above.
 
 template<typename CharType>
 inline bool isHTMLSpace(CharType character)
 {
     // Histogram from Apple's page load test combined with some ad hoc browsing some other test suites.
     //
     //     82%: 216330 non-space characters, all > U+0020
     //     11%:  30017 plain space characters, U+0020
     //      5%:  12099 newline characters, U+000A
@@ skipping 44 matching lines @@
     else if (width == Force8Bit)
         string = String::make8BitFrom16BitSource(vector);
     else
         string = String(vector);
 
     return string;
 }
 
 }
 #endif