Revert of Remove scoped styles.

Source/core/css/invalidation/StyleSheetInvalidationAnalysis.cpp

 /*
  * Copyright (C) 2012 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 74 matching lines @@
         const StyleRule* styleRule = toStyleRule(rule);
         const CSSSelectorList& selectorList = styleRule->selectorList();
         for (size_t selectorIndex = 0; selectorIndex != kNotFound; selectorIndex = selectorList.indexOfNextSelectorAfter(selectorIndex)) {
             if (selectorList.hasShadowDistributedAt(selectorIndex))
                 return true;
         }
     }
     return false;
 }
 
-static Node* determineScopingNodeForStyleInShadow(HTMLStyleElement* ownerElement, StyleSheetContents* styleSheetContents)
+static Node* determineScopingNodeForStyleScoped(HTMLStyleElement* ownerElement, StyleSheetContents* styleSheetContents)
 {
-    ASSERT(ownerElement && ownerElement->isInShadowTree());
+    ASSERT(ownerElement && ownerElement->isRegisteredAsScoped());
 
-    if (hasDistributedRule(styleSheetContents)) {
-        ContainerNode* scope = ownerElement;
-        do {
-            scope = scope->containingShadowRoot()->shadowHost();
-        } while (scope->isInShadowTree());
-        return scope;
+    if (ownerElement->isInShadowTree()) {
+        if (hasDistributedRule(styleSheetContents)) {
+            ContainerNode* scope = ownerElement;
+            do {
+                scope = scope->containingShadowRoot()->shadowHost();
+            } while (scope->isInShadowTree());
+
+            return scope;
+        }
+        if (ownerElement->isRegisteredAsScoped())
+            return ownerElement->containingShadowRoot()->shadowHost();
     }
 
-    return ownerElement->containingShadowRoot()->shadowHost();
+    return ownerElement->isRegisteredInShadowRoot() ? ownerElement->containingShadowRoot()->shadowHost() : ownerElement->parentNode();
 }
 
 static bool ruleAdditionMightRequireDocumentStyleRecalc(StyleRuleBase* rule)
 {
     // This funciton is conservative. We only return false when we know that
     // the added @rule can't require style recalcs.
     switch (rule->type()) {
     case StyleRule::Import: // Whatever we import should do its own analysis, we don't need to invalidate the document here!
     case StyleRule::Keyframes: // Keyframes never cause style invalidations and are handled during sheet insertion.
     case StyleRule::Page: // Page rules apply only during printing, we force a full-recalc before printing.
@@ skipping 27 matching lines @@
     const WillBeHeapVector<RefPtrWillBeMember<StyleRuleImport> >& importRules = styleSheetContents->importRules();
     for (unsigned i = 0; i < importRules.size(); ++i) {
         if (!importRules[i]->styleSheet())
             continue;
         analyzeStyleSheet(importRules[i]->styleSheet());
         if (m_dirtiesAllStyle)
             return;
     }
     if (styleSheetContents->hasSingleOwnerNode()) {
         Node* ownerNode = styleSheetContents->singleOwnerNode();
-        if (isHTMLStyleElement(ownerNode) && toHTMLStyleElement(*ownerNode).isInShadowTree()) {
-            m_scopingNodes.append(determineScopingNodeForStyleInShadow(toHTMLStyleElement(ownerNode), styleSheetContents));
+        if (isHTMLStyleElement(ownerNode) && toHTMLStyleElement(*ownerNode).isRegisteredAsScoped()) {
+            m_scopingNodes.append(determineScopingNodeForStyleScoped(toHTMLStyleElement(ownerNode), styleSheetContents));
             return;
         }
     }
 
     const WillBeHeapVector<RefPtrWillBeMember<StyleRuleBase> >& rules = styleSheetContents->childRules();
     for (unsigned i = 0; i < rules.size(); i++) {
         StyleRuleBase* rule = rules[i].get();
         if (!rule->isStyleRule()) {
             if (ruleAdditionMightRequireDocumentStyleRecalc(rule)) {
                 m_dirtiesAllStyle = true;
@@ skipping 40 matching lines @@
             element->setNeedsStyleRecalc(SubtreeStyleChange);
             // The whole subtree is now invalidated, we can skip to the next sibling.
             element = ElementTraversal::nextSkippingChildren(*element);
             continue;
         }
         element = ElementTraversal::next(*element);
     }
 }
 
 }