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

Source/core/page/EventHandler.h

Index: Source/core/page/EventHandler.h
diff --git a/Source/core/page/EventHandler.h b/Source/core/page/EventHandler.h
index bbf129caa715e64abaa6144064144b1535e30118..643525df462baa134dfb12e848002279a7b3188e 100644
--- a/Source/core/page/EventHandler.h
+++ b/Source/core/page/EventHandler.h
@@ -152,7 +152,7 @@ public:
     // 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&);