Add support for new CSS ::slotted() pseudo element

third_party/WebKit/Source/core/css/resolver/ScopedStyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 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.
@@ skipping 188 matching lines @@
 {
     for (unsigned i = 0; i < rules.size(); ++i) {
         const MinimalRuleData& info = rules[i];
         ruleSet->addRule(info.m_rule, info.m_selectorIndex, info.m_flags);
     }
 }
 
 void ScopedStyleResolver::addTreeBoundaryCrossingRules(const RuleSet& authorRules, CSSStyleSheet* parentStyleSheet, unsigned sheetIndex)
 {
     bool isDocumentScope = treeScope().rootNode().isDocumentNode();
-    if (authorRules.deepCombinatorOrShadowPseudoRules().isEmpty() && (isDocumentScope || authorRules.shadowDistributedRules().isEmpty()))
+    if (authorRules.deepCombinatorOrShadowPseudoRules().isEmpty()
+        && (isDocumentScope || (authorRules.shadowDistributedRules().isEmpty() && authorRules.shadowSlottedRules().isEmpty())))
         return;
 
     if (!authorRules.deepCombinatorOrShadowPseudoRules().isEmpty())
         m_hasDeepOrShadowSelector = true;
 
     OwnPtrWillBeRawPtr<RuleSet> ruleSetForScope = RuleSet::create();
     addRules(ruleSetForScope.get(), authorRules.deepCombinatorOrShadowPseudoRules());
 
-    if (!isDocumentScope)
+    if (!isDocumentScope) {
         addRules(ruleSetForScope.get(), authorRules.shadowDistributedRules());
+        addRules(ruleSetForScope.get(), authorRules.shadowSlottedRules());
+    }
 
     if (!m_treeBoundaryCrossingRuleSet) {
         m_treeBoundaryCrossingRuleSet = adoptPtrWillBeNoop(new CSSStyleSheetRuleSubSet());
         treeScope().document().styleResolver()->addTreeBoundaryCrossingScope(treeScope().rootNode());
     }
 
     m_treeBoundaryCrossingRuleSet->append(RuleSubSet::create(parentStyleSheet, sheetIndex, ruleSetForScope.release()));
 }
 
 DEFINE_TRACE(ScopedStyleResolver::RuleSubSet)
 {
     visitor->trace(m_parentStyleSheet);
     visitor->trace(m_ruleSet);
 }
 
 } // namespace blink