Implement matching part of ::slotted() pseudo element

third_party/WebKit/Source/core/css/CSSSelectorList.cpp

 /*
  * Copyright (C) 2008, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 167 matching lines @@
 bool CSSSelectorList::selectorUsesDeepCombinatorOrShadowPseudo(size_t index) const
 {
     return forEachTagSelector([](const CSSSelector& selector) -> bool {
         return selector.relation() == CSSSelector::ShadowDeep || selector.pseudoType() == CSSSelector::PseudoShadow;
     }, selectorAt(index));
 }
 
 bool CSSSelectorList::selectorNeedsUpdatedDistribution(size_t index) const
 {
     return forEachTagSelector([](const CSSSelector& selector) -> bool {
-        return selector.relationIsAffectedByPseudoContent() || selector.pseudoType() == CSSSelector::PseudoHostContext;
+        return selector.relationIsAffectedByPseudoContent() || selector.pseudoType() == CSSSelector::PseudoSlotted || selector.pseudoType() == CSSSelector::PseudoHostContext;
     }, selectorAt(index));
 }
 
 } // namespace blink