Implement touch-action pan-x/pan-y handling on the main thread

Source/core/page/EventHandler.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 210 matching lines @@
     void fakeMouseMoveEventTimerFired(Timer<EventHandler>*);
     void cancelFakeMouseMoveEvent();
     bool isCursorVisible() const;
     void updateCursor();
 
     bool isInsideScrollbar(const IntPoint&) const;
 
     ScrollableArea* associatedScrollableArea(const RenderLayer*) const;
 
     bool dispatchSyntheticTouchEventIfEnabled(const PlatformMouseEvent&);
+
+    TouchAction intersectTouchAction(const TouchAction, const TouchAction);
     TouchAction computeEffectiveTouchAction(const Node&);
 
     bool handleMouseEventAsEmulatedGesture(const PlatformMouseEvent&);
     bool handleWheelEventAsEmulatedGesture(const PlatformWheelEvent&);
     HitTestResult hitTestResultInFrame(Frame*, const LayoutPoint&, HitTestRequest::HitTestRequestType hitType = HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent);
 
     void invalidateClick();
 
     Node* nodeUnderMouse() const;
 
@@ skipping 138 matching lines @@
     float m_syntheticPageScaleFactor;
 
     Timer<EventHandler> m_activeIntervalTimer;
     double m_lastShowPressTimestamp;
     RefPtr<Element> m_lastDeferredTapElement;
 };
 
 } // namespace WebCore
 
 #endif // EventHandler_h