Add WebKit API for doing a hit-test that mimics GestureTap

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 134 matching lines @@
     // Called on the local root frame exactly once per gesture event.
     bool handleGestureEvent(const PlatformGestureEvent&);
     bool handleGestureEvent(const GestureEventWithHitTestResults&);
 
     // Hit-test the provided (non-scroll) gesture event, applying touch-adjustment and updating
     // hover/active state across all frames if necessary. This should be called at most once
     // per gesture event, and called on the local root frame.
     // Note: This is similar to (the less clearly named) prepareMouseEvent.
     // FIXME: Remove readOnly param when there is only ever a single call to this.
     GestureEventWithHitTestResults targetGestureEvent(const PlatformGestureEvent&, bool readOnly = false);
-
+    GestureEventWithHitTestResults hitTestResultForGestureEvent(const PlatformGestureEvent&, HitTestRequest::HitTestRequestType);
     // Handle the provided non-scroll gesture event. Should be called only on the inner frame.
     bool handleGestureEventInFrame(const GestureEventWithHitTestResults&);
 
     // Handle the provided scroll gesture event, propagating down to child frames as necessary.
     bool handleGestureScrollEvent(const PlatformGestureEvent&);
     bool handleGestureScrollEnd(const PlatformGestureEvent&);
     bool isScrollbarHandlingGestures() const;
 
     bool bestClickableNodeForHitTestResult(const HitTestResult&, IntPoint& targetPoint, Node*& targetNode);
     bool bestContextMenuNodeForHitTestResult(const HitTestResult&, IntPoint& targetPoint, Node*& targetNode);
@@ skipping 234 matching lines @@
     bool m_longTapShouldInvokeContextMenu;
 
     Timer<EventHandler> m_activeIntervalTimer;
     double m_lastShowPressTimestamp;
     RefPtrWillBeMember<Element> m_lastDeferredTapElement;
 };
 
 } // namespace blink
 
 #endif // EventHandler_h