Add support for touch-action: pinch-zoom.

third_party/WebKit/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 4276 matching lines @@
     case CSSValuePanX:
         return TouchActionPanX;
     case CSSValuePanUp:
         return TouchActionPanUp;
     case CSSValuePanDown:
         return TouchActionPanDown;
     case CSSValuePanY:
         return TouchActionPanY;
     case CSSValueManipulation:
         return TouchActionManipulation;
+    case CSSValuePinchZoom:
+        return TouchActionPinchZoom;
     default:
         break;
     }
 
     ASSERT_NOT_REACHED();
     return TouchActionNone;
 }
 
 template<> inline CSSPrimitiveValue::CSSPrimitiveValue(EIsolation i)
     : CSSValue(PrimitiveClass)
@@ skipping 410 matching lines @@
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return ContainsNone;
 }
 
 } // namespace blink
 
 #endif