Add hittest mode for Touch-action which ignore inline elements and svg elements

Source/core/rendering/HitTestRequest.h

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
  * Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 22 matching lines @@
         Move = 1 << 3,
         Release = 1 << 4,
         IgnoreClipping = 1 << 5,
         SVGClipContent = 1 << 6,
         TouchEvent = 1 << 7,
         // Deprecated. Instead of this, callers should call HitTestResult::setToNodesInDocumentTreeScope() explicitly.
         ConfusingAndOftenMisusedDisallowShadowContent = 1 << 8,
         AllowFrameScrollbars = 1 << 9,
         AllowChildFrameContent = 1 << 10,
         ChildFrameHitTest = 1 << 11,
-        IgnorePointerEventsNone = 1 << 12
+        IgnorePointerEventsNone = 1 << 12,
+        TouchAction = 1 << 13

[Rick Byers, 2014/01/17 16:12:46]

Please add a brief comment describing this: eg. "Hit testing for touch-action
considers only blocks-level elements":
http://www.w3.org/TR/pointerevents/#the-touch-action-css-property.  

Note that there's more detail about this in the working draft -
https://dvcs.w3.org/hg/pointerevents/raw-file/tip/pointerEvents.html#the-touc...
- but that'll be published at some point.

     };
 
     typedef unsigned HitTestRequestType;
 
     HitTestRequest(HitTestRequestType requestType)
         : m_requestType(requestType)
     {
     }
 
     bool readOnly() const { return m_requestType & ReadOnly; }
     bool active() const { return m_requestType & Active; }
     bool move() const { return m_requestType & Move; }
     bool release() const { return m_requestType & Release; }
     bool ignoreClipping() const { return m_requestType & IgnoreClipping; }
     bool svgClipContent() const { return m_requestType & SVGClipContent; }
     bool touchEvent() const { return m_requestType & TouchEvent; }
     bool mouseEvent() const { return !touchEvent(); }
     bool disallowsShadowContent() const { return m_requestType & ConfusingAndOftenMisusedDisallowShadowContent; }
     bool allowsFrameScrollbars() const { return m_requestType & AllowFrameScrollbars; }
     bool allowsChildFrameContent() const { return m_requestType & AllowChildFrameContent; }
     bool isChildFrameHitTest() const { return m_requestType & ChildFrameHitTest; }
     bool ignorePointerEventsNone() const { return m_requestType & IgnorePointerEventsNone; }
+    bool touchAction() const { return m_requestType & TouchAction; }
 
     // Convenience functions
     bool touchMove() const { return move() && touchEvent(); }
     bool touchRelease() const { return release() && touchEvent(); }
 
     HitTestRequestType type() const { return m_requestType; }
 
 private:
     HitTestRequestType m_requestType;
 };
 
 } // namespace WebCore
 
 #endif // HitTestRequest_h