Add support for new CSS ::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 23cd25f04315ade12d5422ea88fe4fddffa7f1a2..8f2351cd2b88b2419ecb9a0376bcbf21764bb16a 100644
--- a/third_party/WebKit/Source/core/css/CSSSelectorList.cpp
+++ b/third_party/WebKit/Source/core/css/CSSSelectorList.cpp
@@ -175,6 +175,20 @@ bool CSSSelectorList::selectorHasShadowDistributed(size_t index) const
     return forEachTagSelector(functor, selectorAt(index));
 }
 
+class SelectorHasShadowSlotted {
+public:
+    bool operator()(const CSSSelector& selector)
+    {
+        return selector.relationIsAffectedByPseudoSlotted();
+    }
+};
+
+bool CSSSelectorList::selectorHasShadowSlotted(size_t index) const
+{
+    SelectorHasShadowSlotted functor;
+    return forEachTagSelector(functor, selectorAt(index));
+}
+
 class SelectorUsesDeepCombinatorOrShadowPseudo {
 public:
     bool operator()(const CSSSelector& selector)
@@ -193,7 +207,7 @@ class SelectorNeedsUpdatedDistribution {
 public:
     bool operator()(const CSSSelector& selector)
     {
-        return selector.relationIsAffectedByPseudoContent() || selector.pseudoType() == CSSSelector::PseudoHostContext;
+        return selector.relationIsAffectedByPseudoContent() || selector.pseudoType() == CSSSelector::PseudoHostContext || selector.pseudoType() == CSSSelector::PseudoSlotted;
     }
 };