Implement CSS parser part for ::slotted pseudo element

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

Index: third_party/WebKit/Source/core/css/RuleSet.cpp
diff --git a/third_party/WebKit/Source/core/css/RuleSet.cpp b/third_party/WebKit/Source/core/css/RuleSet.cpp
index db68b88cfd0aa6e67f6b0ecee2cc744aa9ef00e1..bc735aa64c17e9154a58c9de90ac2073e92fa9d2 100644
--- a/third_party/WebKit/Source/core/css/RuleSet.cpp
+++ b/third_party/WebKit/Source/core/css/RuleSet.cpp
@@ -260,8 +260,10 @@ void RuleSet::addChildRules(const WillBeHeapVector<RefPtrWillBeMember<StyleRuleB
             for (size_t selectorIndex = 0; selectorIndex != kNotFound; selectorIndex = selectorList.indexOfNextSelectorAfter(selectorIndex)) {
                 if (selectorList.selectorUsesDeepCombinatorOrShadowPseudo(selectorIndex)) {
                     m_deepCombinatorOrShadowPseudoRules.append(MinimalRuleData(styleRule, selectorIndex, addRuleFlags));
-                } else if (selectorList.selectorHasShadowDistributed(selectorIndex)) {
+                } else if (selectorList.selectorHasContentPseudo(selectorIndex)) {
                     m_shadowDistributedRules.append(MinimalRuleData(styleRule, selectorIndex, addRuleFlags));
+                } else if (selectorList.selectorHasSlottedPseudo(selectorIndex)) {
+                    m_shadowSlottedRules.append(MinimalRuleData(styleRule, selectorIndex, addRuleFlags));
                 } else {
                     addRule(styleRule, selectorIndex, addRuleFlags);
                 }
@@ -342,6 +344,7 @@ void RuleSet::compactRules()
     m_keyframesRules.shrinkToFit();
     m_deepCombinatorOrShadowPseudoRules.shrinkToFit();
     m_shadowDistributedRules.shrinkToFit();
+    m_shadowSlottedRules.shrinkToFit();
 }
 
 DEFINE_TRACE(MinimalRuleData)
@@ -383,6 +386,7 @@ DEFINE_TRACE(RuleSet)
     visitor->trace(m_keyframesRules);
     visitor->trace(m_deepCombinatorOrShadowPseudoRules);
     visitor->trace(m_shadowDistributedRules);
+    visitor->trace(m_shadowSlottedRules);
     visitor->trace(m_viewportDependentMediaQueryResults);
     visitor->trace(m_deviceDependentMediaQueryResults);
     visitor->trace(m_pendingRules);