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

Source/core/css/CSSPrimitiveValueMappings.h

 /*
  * Copyright (C) 2007 Alexey Proskuryakov <ap@nypop.com>.
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ skipping 3318 matching lines @@
         break;
     case PE_VISIBLE_PAINTED:
         m_value.valueID = CSSValueVisiblepainted;
         break;
     case PE_AUTO:
         m_value.valueID = CSSValueAuto;
         break;
     case PE_ALL:
         m_value.valueID = CSSValueAll;
         break;
+    case PE_BOUNDINGBOX:
+        m_value.valueID = CSSValueBoundingBox;
+        break;
     }
 }
 
 template<> inline CSSPrimitiveValue::operator EPointerEvents() const
 {
     ASSERT(isValueID());
     switch (m_value.valueID) {
     case CSSValueAll:
         return PE_ALL;
     case CSSValueAuto:
         return PE_AUTO;
     case CSSValueNone:
         return PE_NONE;
     case CSSValueVisiblepainted:
         return PE_VISIBLE_PAINTED;
     case CSSValueVisiblefill:
         return PE_VISIBLE_FILL;
     case CSSValueVisiblestroke:
         return PE_VISIBLE_STROKE;
     case CSSValueVisible:
         return PE_VISIBLE;
     case CSSValuePainted:
         return PE_PAINTED;
     case CSSValueFill:
         return PE_FILL;
     case CSSValueStroke:
         return PE_STROKE;
+    case CSSValueBoundingBox:
+        return PE_BOUNDINGBOX;
     default:
         break;
     }
 
     ASSERT_NOT_REACHED();
     return PE_ALL;
 }
 
 template<> inline CSSPrimitiveValue::CSSPrimitiveValue(FontDescription::Kerning kerning)
     : CSSValue(PrimitiveClass)
@@ skipping 1608 matching lines @@
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return ContentBox;
 }
 
 }
 
 #endif