New parser mode for CSSOM @viewport descriptors.

Source/core/css/CSSParser.h

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 - 2010  Torch Mobile (Beijing) Co. Ltd. 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 515 matching lines @@
     inline void detectDashToken(int);
     template <typename CharacterType>
     inline void detectAtToken(int, bool);
     template <typename CharacterType>
     inline void detectSupportsToken(int);
     template <typename CharacterType>
     inline void detectCSSVariableDefinitionToken(int);
 
     void setStyleSheet(StyleSheetContents* styleSheet) { m_styleSheet = styleSheet; }
 
-    inline bool inStrictMode() const { return m_context.mode == CSSStrictMode || m_context.mode == SVGAttributeMode; }
+    inline bool inStrictMode() const { return isStrictParserMode(m_context.mode); }
     inline bool inQuirksMode() const { return m_context.mode == CSSQuirksMode; }
 
     KURL completeURL(const String& url) const;
 
     void recheckAtKeyword(const UChar* str, int len);
 
     template<unsigned prefixLength, unsigned suffixLength>
     inline void setupParser(const char (&prefix)[prefixLength], const String& string, const char (&suffix)[suffixLength])
     {
         setupParser(prefix, prefixLength - 1, string, suffix, suffixLength - 1);
@@ skipping 210 matching lines @@
 }
 
 inline int cssyylex(void* yylval, CSSParser* parser)
 {
     return parser->lex(yylval);
 }
 
 } // namespace WebCore
 
 #endif // CSSParser_h