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 4859 matching lines @@
     : CSSValue(PrimitiveClass)
 {
     m_primitiveUnitType = CSS_VALUE_ID;
     switch (t) {
     case TouchActionNone:
         m_value.valueID = CSSValueNone;
         break;
     case TouchActionAuto:
         m_value.valueID = CSSValueAuto;
         break;
+    case TouchActionPanX:
+        m_value.valueID = CSSValuePanX;
+        break;
+    case TouchActionPanY:
+        m_value.valueID = CSSValuePanY;
+        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