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

Source/core/css/CSSParser-in.cpp

Index: Source/core/css/CSSParser-in.cpp
diff --git a/Source/core/css/CSSParser-in.cpp b/Source/core/css/CSSParser-in.cpp
index 93bd837a1bb627eaff132ff3e1c959a2eb140f8d..e8d051bb2831f4b4423d042497d0fe61e046069d 100644
--- a/Source/core/css/CSSParser-in.cpp
+++ b/Source/core/css/CSSParser-in.cpp
@@ -564,8 +564,8 @@ static inline bool isValidKeywordPropertyAndValue(CSSPropertyID propertyId, int
         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