Add pointer-events="bounding-box" for svg content.

Source/core/rendering/style/RenderStyleConstants.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 442 matching lines @@
     GRID, INLINE_GRID,
     NONE
 };
 
 enum EInsideLink {
     NotInsideLink, InsideUnvisitedLink, InsideVisitedLink
 };
 
 enum EPointerEvents {
     PE_NONE, PE_AUTO, PE_STROKE, PE_FILL, PE_PAINTED, PE_VISIBLE,
-    PE_VISIBLE_STROKE, PE_VISIBLE_FILL, PE_VISIBLE_PAINTED, PE_ALL
+    PE_VISIBLE_STROKE, PE_VISIBLE_FILL, PE_VISIBLE_PAINTED, PE_BOUNDINGBOX,
+    PE_ALL
 };
 
 enum ETransformStyle3D {
     TransformStyle3DFlat, TransformStyle3DPreserve3D
 };
 
 enum EBackfaceVisibility {
     BackfaceVisibilityVisible, BackfaceVisibilityHidden
 };
 
@@ skipping 48 matching lines @@
 enum TouchActionDelay { TouchActionDelayNone, TouchActionDelayScript };
 
 // Reasonable maximum to prevent insane font sizes from causing crashes on some platforms (such as Windows).
 static const float maximumAllowedFontSize = 1000000.0f;
 
 enum TextIndentLine { TextIndentFirstLine, TextIndentEachLine };
 
 } // namespace WebCore
 
 #endif // RenderStyleConstants_h