Implement support for the 'transform-box' property

third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp

Index: third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp b/third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp
index 13596044d7c22bc8720c1a78ed7a39db0488c6d4..7e3d55409dc1f443d38198e1949cf2ece2acec47 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp
@@ -806,6 +806,9 @@ bool CSSParserFastPaths::isValidKeywordPropertyAndValue(
     case CSSPropertyWebkitTextSecurity:
       return valueID == CSSValueDisc || valueID == CSSValueCircle ||
              valueID == CSSValueSquare || valueID == CSSValueNone;
+    case CSSPropertyTransformBox:
+      return valueID == CSSValueBorderBox || valueID == CSSValueFillBox ||
+             valueID == CSSValueViewBox;
     case CSSPropertyTransformStyle:
       return valueID == CSSValueFlat || valueID == CSSValuePreserve3d;
     case CSSPropertyWebkitUserDrag:
@@ -938,6 +941,7 @@ bool CSSParserFastPaths::isKeywordPropertyID(CSSPropertyID propertyId) {
     case CSSPropertyWebkitTextCombine:
     case CSSPropertyWebkitTextEmphasisPosition:
     case CSSPropertyWebkitTextSecurity:
+    case CSSPropertyTransformBox:
     case CSSPropertyTransformStyle:
     case CSSPropertyWebkitUserDrag:
     case CSSPropertyWebkitUserModify: