add 'manipulation' support to CSS touch-action parsing.

public/web/WebTouchAction.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 20 matching lines @@
 #ifndef WebTouchAction_h
 #define WebTouchAction_h
 
 namespace blink {
 
 // Flags for permitted touch actions, specified in http://www.w3.org/TR/pointerevents/#the-touch-action-css-property.
 enum WebTouchAction {
     WebTouchActionAuto = 0x0,
     WebTouchActionNone = 0x1,
     WebTouchActionPanX = 0x2,
-    WebTouchActionPanY = 0x4
+    WebTouchActionPanY = 0x4,
+    WebTouchActionZoom = 0x8,

[Rick Byers, 2014/03/05 14:41:13]

Since this is intended to control pinch-zoom but NOT double-tap-zoom I think we
should be more explicit in the name.  Maybe WebTouchActionPinchZoom? 

[gnana, 2014/03/06 08:11:14]

Done.

 };
 inline WebTouchAction operator| (WebTouchAction a, WebTouchAction b) { return WebTouchAction(int(a) | int(b)); }
 inline WebTouchAction& operator|= (WebTouchAction& a, WebTouchAction b) { return a = a | b; }
 inline WebTouchAction operator& (WebTouchAction a, WebTouchAction b) { return WebTouchAction(int(a) & int(b)); }
 inline WebTouchAction& operator&= (WebTouchAction& a, WebTouchAction b) { return a = a & b; }
 
 
 } // namespace blink
 
 #endif