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

Source/core/css/CSSPrimitiveValueMappings.h

 /*
  * Copyright (C) 2007 Alexey Proskuryakov <ap@nypop.com>.
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ skipping 4848 matching lines @@
     case CSSValueAlpha:
         return MT_ALPHA;
     default:
         break;
     }
 
     ASSERT_NOT_REACHED();
     return MT_LUMINANCE;
 }
 
-template<> inline CSSPrimitiveValue::CSSPrimitiveValue(TouchAction t)
-    : CSSValue(PrimitiveClass)
-{
-    m_primitiveUnitType = CSS_VALUE_ID;
-    switch (t) {
-    case TouchActionNone:
-        m_value.valueID = CSSValueNone;
-        break;
-    case TouchActionAuto:
-        m_value.valueID = CSSValueAuto;
-        break;
-    }
-}
-
 template<> inline CSSPrimitiveValue::operator TouchAction() const
 {
     ASSERT(isValueID());
     switch (m_value.valueID) {
     case CSSValueNone:
         return TouchActionNone;
     case CSSValueAuto:
         return TouchActionAuto;
+    case CSSValuePanX:
+        return TouchActionPanX;
+    case CSSValuePanY:
+        return TouchActionPanY;
     default:
         break;
     }
 
     ASSERT_NOT_REACHED();
     return TouchActionNone;
 }
 
 template<> inline CSSPrimitiveValue::CSSPrimitiveValue(EIsolation i)
     : CSSValue(PrimitiveClass)
@@ skipping 88 matching lines @@
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return ContentBox;
 }
 
 }
 
 #endif