Implement CSS parser part for ::slotted pseudo element

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

Index: third_party/WebKit/Source/core/css/CSSSelectorList.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSSelectorList.cpp b/third_party/WebKit/Source/core/css/CSSSelectorList.cpp
index 114fb8460e58dd0739288b723d1235976e1d1985..7cba4aa16fd6f98ed6f3bddca2ac136da9ffb062 100644
--- a/third_party/WebKit/Source/core/css/CSSSelectorList.cpp
+++ b/third_party/WebKit/Source/core/css/CSSSelectorList.cpp
@@ -161,13 +161,20 @@ bool CSSSelectorList::selectorsNeedNamespaceResolution()
     }, this);
 }
 
-bool CSSSelectorList::selectorHasShadowDistributed(size_t index) const
+bool CSSSelectorList::selectorHasContentPseudo(size_t index) const
 {
     return forEachTagSelector([](const CSSSelector& selector) -> bool {
         return selector.relationIsAffectedByPseudoContent();
     }, selectorAt(index));
 }
 
+bool CSSSelectorList::selectorHasSlottedPseudo(size_t index) const
+{
+    return forEachTagSelector([](const CSSSelector& selector) ->  bool {
+        return selector.pseudoType() == CSSSelector::PseudoSlotted;
+    }, selectorAt(index));
+}
+
 bool CSSSelectorList::selectorUsesDeepCombinatorOrShadowPseudo(size_t index) const
 {
     return forEachTagSelector([](const CSSSelector& selector) -> bool {