Adds keyboard functionality for videos.

third_party/WebKit/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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef SpatialNavigation_h
 #define SpatialNavigation_h
 
+#include "core/CoreExport.h"
 #include "core/dom/Node.h"
 #include "platform/geometry/LayoutRect.h"
 #include "public/platform/WebFocusType.h"
 
 #include <limits>
 
 namespace blink {
 
 class LocalFrame;
 class HTMLAreaElement;
 class HTMLFrameOwnerElement;
 
 inline double MaxDistance() {
   return std::numeric_limits<double>::max();
 }
 
 inline int FudgeFactor() {
   return 2;
 }
 
-bool IsSpatialNavigationEnabled(const LocalFrame*);
+CORE_EXPORT 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 90 matching lines @@
 LayoutRect VirtualRectForDirection(WebFocusType,
                                    const LayoutRect& starting_rect,
                                    LayoutUnit width = LayoutUnit());
 LayoutRect VirtualRectForAreaElementAndDirection(HTMLAreaElement&,
                                                  WebFocusType);
 HTMLFrameOwnerElement* FrameOwnerElement(FocusCandidate&);
 
 }  // namespace blink
 
 #endif  // SpatialNavigation_h