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 0604e13f11b57db5b0eb96d91b88b09e94a8d925..8dd4fa58eebc8ccd8e1e4b736f995c08f5e03b34 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp
@@ -804,6 +804,9 @@ 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:
@@ -936,6 +939,7 @@ bool CSSParserFastPaths::isKeywordPropertyID(CSSPropertyID propertyId) {
     case CSSPropertyWebkitTextCombine:
     case CSSPropertyWebkitTextEmphasisPosition:
     case CSSPropertyWebkitTextSecurity:
+    case CSSPropertyTransformBox:
     case CSSPropertyTransformStyle:
     case CSSPropertyWebkitUserDrag:
     case CSSPropertyWebkitUserModify: