Add parsing support for display: contents, and minimum behavior similar to display: none

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/parser/CSSParserFastPaths.h"
 
 #include "core/StylePropertyShorthand.h"
 #include "core/css/CSSColorValue.h"
 #include "core/css/CSSFunctionValue.h"
 #include "core/css/CSSIdentifierValue.h"
@@ skipping 528 matching lines @@
     case CSSPropertyColorRendering:
       return valueID == CSSValueAuto || valueID == CSSValueOptimizeSpeed ||
              valueID == CSSValueOptimizeQuality;
     case CSSPropertyDirection:
       return valueID == CSSValueLtr || valueID == CSSValueRtl;
     case CSSPropertyDisplay:
       return (valueID >= CSSValueInline && valueID <= CSSValueInlineFlex) ||
              valueID == CSSValueWebkitFlex ||
              valueID == CSSValueWebkitInlineFlex || valueID == CSSValueNone ||
              (RuntimeEnabledFeatures::cssGridLayoutEnabled() &&
-              (valueID == CSSValueGrid || valueID == CSSValueInlineGrid));
+              (valueID == CSSValueGrid || valueID == CSSValueInlineGrid)) ||
+             (RuntimeEnabledFeatures::cssDisplayContentsEnabled() &&
+              valueID == CSSValueContents);
     case CSSPropertyDominantBaseline:
       return valueID == CSSValueAuto || valueID == CSSValueAlphabetic ||
              valueID == CSSValueMiddle ||
              (valueID >= CSSValueUseScript && valueID <= CSSValueResetSize) ||
              (valueID >= CSSValueCentral && valueID <= CSSValueMathematical);
     case CSSPropertyEmptyCells:
       return valueID == CSSValueShow || valueID == CSSValueHide;
     case CSSPropertyFloat:
       return valueID == CSSValueLeft || valueID == CSSValueRight ||
              valueID == CSSValueNone;
@@ skipping 638 matching lines @@
   if (isColorPropertyID(propertyID))
     return parseColor(string, parserMode);
   if (CSSValue* keyword = parseKeywordValue(propertyID, string, parserMode))
     return keyword;
   if (CSSValue* transform = parseSimpleTransform(propertyID, string))
     return transform;
   return nullptr;
 }
 
 }  // namespace blink