Introduce setNeedsActiveStyleUpdate for adding/removing stylesheets.

third_party/WebKit/Source/core/dom/StyleEngine.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 73 matching lines @@
 #if !ENABLE(OILPAN)
     void detachFromDocument();
 #endif
 
     const WillBeHeapVector<RefPtrWillBeMember<StyleSheet>>& styleSheetsForStyleSheetList(TreeScope&);
 
     const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet>>& injectedAuthorStyleSheets() const { return m_injectedAuthorStyleSheets; }
 
     const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet>> activeStyleSheetsForInspector() const;
 
-    void modifiedStyleSheet(StyleSheet*);
+    void setNeedsActiveStyleUpdate(StyleSheet*, StyleResolverUpdateMode);
     void addStyleSheetCandidateNode(Node*);
     void removeStyleSheetCandidateNode(Node*);
     void removeStyleSheetCandidateNode(Node*, TreeScope&);
     void modifiedStyleSheetCandidateNode(Node*);
     void watchedSelectorsChanged();
 
     void injectAuthorSheet(PassRefPtrWillBeRawPtr<StyleSheetContents> authorSheet);
 
     void clearMediaQueryRuleSetStyleSheets();
     void updateStyleSheetsInImport(DocumentStyleSheetCollector& parentCollector);
@@ skipping 169 matching lines @@
 
     OwnPtr<StyleResolverStats> m_styleResolverStats;
     unsigned m_styleForElementCount = 0;
 
     friend class StyleEngineTest;
 };
 
 } // namespace blink
 
 #endif