add pan-x and pan-y support to CSS touch-action parsing.

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 263 matching lines @@
     static bool isBlendMode(CSSValueID);
     static bool isCompositeOperator(CSSValueID);
 
     PassRefPtr<CSSValueList> parseTransform();
     PassRefPtr<CSSValue> parseTransformValue(CSSParserValue*);
     bool parseTransformOrigin(CSSPropertyID propId, CSSPropertyID& propId1, CSSPropertyID& propId2, CSSPropertyID& propId3, RefPtr<CSSValue>&, RefPtr<CSSValue>&, RefPtr<CSSValue>&);
     bool parsePerspectiveOrigin(CSSPropertyID propId, CSSPropertyID& propId1, CSSPropertyID& propId2,  RefPtr<CSSValue>&, RefPtr<CSSValue>&);
 
     bool parseTextEmphasisStyle(bool important);
 
+    bool parseTouchAction(CSSPropertyID propId, bool important);
+
     void addTextDecorationProperty(CSSPropertyID, PassRefPtr<CSSValue>, bool important);
     bool parseTextDecoration(CSSPropertyID propId, bool important);
     bool parseTextUnderlinePosition(bool important);
 
     PassRefPtr<CSSValue> parseTextIndent();
 
     bool parseLineBoxContain(bool important);
     bool parseCalculation(CSSParserValue*, ValueRange);
 
     bool parseFontFeatureTag(CSSValueList*);
@@ skipping 371 matching lines @@
 bool isValidNthToken(const CSSParserString&);
 
 inline int cssyylex(void* yylval, CSSParser* parser)
 {
     return parser->m_tokenizer.lex(yylval);
 }
 
 } // namespace WebCore
 
 #endif // CSSParser_h