Introduce setNeedsActiveStyleUpdate for adding/removing stylesheets.

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

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 16 matching lines @@
 #include "core/SVGNames.h"
 #include "core/css/CSSImportRule.h"
 #include "core/css/CSSRuleList.h"
 #include "core/css/MediaList.h"
 #include "core/css/StyleRule.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/css/parser/CSSParser.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/Node.h"
+#include "core/dom/StyleEngine.h"
 #include "core/frame/Deprecation.h"
 #include "core/html/HTMLStyleElement.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/svg/SVGStyleElement.h"
 #include "platform/weborigin/SecurityOrigin.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 class StyleSheetCSSRuleList final : public CSSRuleList {
@@ skipping 146 matching lines @@
 
 void CSSStyleSheet::didMutate(StyleSheetUpdateType updateType)
 {
     Document* owner = ownerDocument();
     if (!owner)
         return;
 
     // Need FullStyleUpdate when insertRule or deleteRule,
     // because StyleSheetCollection::analyzeStyleSheetChange cannot detect partial rule update.
     StyleResolverUpdateMode updateMode = updateType != PartialRuleUpdate ? AnalyzedStyleUpdate : FullStyleUpdate;
-    owner->modifiedStyleSheet(this, updateMode);
+    owner->styleEngine().setNeedsActiveStyleUpdate(this, updateMode);
 }
 
 void CSSStyleSheet::reattachChildRuleCSSOMWrappers()
 {
     for (unsigned i = 0; i < m_childRuleCSSOMWrappers.size(); ++i) {
         if (!m_childRuleCSSOMWrappers[i])
             continue;
         m_childRuleCSSOMWrappers[i]->reattach(m_contents->ruleAt(i));
     }
 }
@@ skipping 240 matching lines @@
     visitor->trace(m_mediaQueries);
     visitor->trace(m_ownerNode);
     visitor->trace(m_ownerRule);
     visitor->trace(m_mediaCSSOMWrapper);
     visitor->trace(m_childRuleCSSOMWrappers);
     visitor->trace(m_ruleListCSSOMWrapper);
     StyleSheet::trace(visitor);
 }
 
 } // namespace blink