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

Source/core/css/CSSParser-in.cpp

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
@@ skipping 546 matching lines @@
         if (valueID == CSSValueAuto || valueID == CSSValueAlways || valueID == CSSValueAvoid || valueID == CSSValueLeft || valueID == CSSValueRight)
             return true;
         break;
     case CSSPropertyPageBreakInside: // avoid | auto | inherit
     case CSSPropertyWebkitColumnBreakInside:
         if (valueID == CSSValueAuto || valueID == CSSValueAvoid)
             return true;
         break;
     case CSSPropertyPointerEvents:
         // none | visiblePainted | visibleFill | visibleStroke | visible |
-        // painted | fill | stroke | auto | all | inherit
-        if (valueID == CSSValueVisible || valueID == CSSValueNone || valueID == CSSValueAll || valueID == CSSValueAuto || (valueID >= CSSValueVisiblepainted && valueID <= CSSValueStroke))
+        // painted | fill | stroke | auto | all | bounding-box | inherit
+        if (valueID == CSSValueVisible || valueID == CSSValueNone || valueID == CSSValueAll || valueID == CSSValueAuto || (valueID >= CSSValueVisiblepainted && valueID <= CSSValueBoundingBox))
             return true;
         break;
     case CSSPropertyPosition: // static | relative | absolute | fixed | sticky | inherit
         if (valueID == CSSValueStatic || valueID == CSSValueRelative || valueID == CSSValueAbsolute || valueID == CSSValueFixed
             || (RuntimeEnabledFeatures::cssStickyPositionEnabled() && valueID == CSSValueSticky))
             return true;
         break;
     case CSSPropertyResize: // none | both | horizontal | vertical | auto
         if (valueID == CSSValueNone || valueID == CSSValueBoth || valueID == CSSValueHorizontal || valueID == CSSValueVertical || valueID == CSSValueAuto)
             return true;
@@ skipping 9835 matching lines @@
 {
     // The tokenizer checks for the construct of an+b.
     // However, since the {ident} rule precedes the {nth} rule, some of those
     // tokens are identified as string literal. Furthermore we need to accept
     // "odd" and "even" which does not match to an+b.
     return equalIgnoringCase(token, "odd") || equalIgnoringCase(token, "even")
         || equalIgnoringCase(token, "n") || equalIgnoringCase(token, "-n");
 }
 
 }