Allow Spatial Navigation ignore elements with event handlers

Source/core/page/SpatialNavigation.h

 /*
  * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Antonio Gomes <tonikitoo@webkit.org>
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 26 matching lines @@
 {
     return std::numeric_limits<double>::max();
 }
 
 inline int fudgeFactor()
 {
     return 2;
 }
 
 bool isSpatialNavigationEnabled(const LocalFrame*);
+bool spatialNavigationIgnoresEventHandlers(const LocalFrame*);
 
 // Spatially speaking, two given elements in a web page can be:
 // 1) Fully aligned: There is a full intersection between the rects, either
 //    vertically or horizontally.
 //
 // * Horizontally       * Vertically
 //    _
 //   |_|                   _ _ _ _ _ _
 //   |_|...... _          |_|_|_|_|_|_|
 //   |_|      |_|         .       .
@@ skipping 80 matching lines @@
 Node* scrollableEnclosingBoxOrParentFrameForNodeInDirection(WebFocusType, Node*);
 LayoutRect nodeRectInAbsoluteCoordinates(Node*, bool ignoreBorder = false);
 LayoutRect frameRectInAbsoluteCoordinates(LocalFrame*);
 LayoutRect virtualRectForDirection(WebFocusType, const LayoutRect& startingRect, LayoutUnit width = 0);
 LayoutRect virtualRectForAreaElementAndDirection(HTMLAreaElement&, WebFocusType);
 HTMLFrameOwnerElement* frameOwnerElement(FocusCandidate&);
 
 } // namespace blink
 
 #endif // SpatialNavigation_h