Use weak members to cache StyleSheetContents.

third_party/WebKit/Source/core/css/StyleSheetContents.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2008, 2009, 2010, 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 64 matching lines @@
 
     bool isLoading() const;
 
     void checkLoaded();
     void startLoadingDynamicSheet();
 
     StyleSheetContents* rootStyleSheet() const;
     bool hasSingleOwnerNode() const;
     Node* singleOwnerNode() const;
     Document* singleOwnerDocument() const;
+    bool hasSingleOwnerDocument() const { return m_hasSingleOwnerDocument; }
 
     const String& charset() const { return m_parserContext.charset(); }
 
     bool loadCompleted() const;
     bool hasFailedOrCanceledSubresources() const;
 
     void setHasSyntacticallyValidCSSHeader(bool isValidCss);
     bool hasSyntacticallyValidCSSHeader() const { return m_hasSyntacticallyValidCSSHeader; }
 
     void setHasFontFaceRule() { m_hasFontFaceRule = true; }
@@ skipping 38 matching lines @@
     void registerClient(CSSStyleSheet*);
     void unregisterClient(CSSStyleSheet*);
     size_t clientSize() const { return m_loadingClients.size() + m_completedClients.size(); }
     bool hasOneClient() { return clientSize() == 1; }
     void clientLoadCompleted(CSSStyleSheet*);
     void clientLoadStarted(CSSStyleSheet*);
 
     bool isMutable() const { return m_isMutable; }
     void setMutable() { m_isMutable = true; }
 
-    void removeSheetFromCache(Document*);
+    bool isUsedFromTextCache() const { return m_isUsedFromTextCache; }
+    void setIsUsedFromTextCache() { m_isUsedFromTextCache = true; }
 
     bool isReferencedFromResource() const { return m_referencedFromResource; }
     void setReferencedFromResource(CSSStyleSheetResource*);
     void clearReferencedFromResource();
 
     void setHasMediaQueries();
     bool hasMediaQueries() const { return m_hasMediaQueries; }
 
     bool didLoadErrorOccur() const { return m_didLoadErrorOccur; }
 
@@ skipping 25 matching lines @@
     PrefixNamespaceURIMap m_namespaces;
     AtomicString m_defaultNamespace;
     WeakMember<CSSStyleSheetResource> m_referencedFromResource;
 
     bool m_hasSyntacticallyValidCSSHeader : 1;
     bool m_didLoadErrorOccur : 1;
     bool m_isMutable : 1;
     bool m_hasFontFaceRule : 1;
     bool m_hasMediaQueries : 1;
     bool m_hasSingleOwnerDocument : 1;
+    bool m_isUsedFromTextCache : 1;
 
     CSSParserContext m_parserContext;
 
     HeapHashSet<WeakMember<CSSStyleSheet>> m_loadingClients;
     HeapHashSet<WeakMember<CSSStyleSheet>> m_completedClients;
 
     Member<RuleSet> m_ruleSet;
     String m_sourceMapURL;
 };
 
 } // namespace blink
 
 #endif