[LazyParseCSS] Ensure UseCounting has parity with strict parsing

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.
  *
@@ skipping 68 matching lines @@
 
   void checkLoaded();
   void startLoadingDynamicSheet();
 
   StyleSheetContents* rootStyleSheet() const;
   bool hasSingleOwnerNode() const;
   Node* singleOwnerNode() const;
   Document* singleOwnerDocument() const;
   bool hasSingleOwnerDocument() const { return m_hasSingleOwnerDocument; }
 
+  // Gets the first owner document in the list of registered clients, or nullptr
+  // if there are none.
+  Document* anyOwnerDocument() const;
+
   const String& charset() const { return m_parserContext.charset(); }
 
   bool loadCompleted() const;
   bool hasFailedOrCanceledSubresources() const;
 
   void setHasSyntacticallyValidCSSHeader(bool isValidCss);
   bool hasSyntacticallyValidCSSHeader() const {
     return m_hasSyntacticallyValidCSSHeader;
   }
 
@@ skipping 81 matching lines @@
  private:
   StyleSheetContents(StyleRuleImport* ownerRule,
                      const String& originalURL,
                      const CSSParserContext&);
   StyleSheetContents(const StyleSheetContents&);
   StyleSheetContents() = delete;
   StyleSheetContents& operator=(const StyleSheetContents&) = delete;
   void notifyRemoveFontFaceRule(const StyleRuleFontFace*);
 
   Document* clientSingleOwnerDocument() const;
+  Document* clientAnyOwnerDocument() const;
 
   Member<StyleRuleImport> m_ownerRule;
 
   String m_originalURL;
 
   HeapVector<Member<StyleRuleImport>> m_importRules;
   HeapVector<Member<StyleRuleNamespace>> m_namespaceRules;
   HeapVector<Member<StyleRuleBase>> m_childRules;
   using PrefixNamespaceURIMap = HashMap<AtomicString, AtomicString>;
   PrefixNamespaceURIMap m_namespaces;
@@ skipping 14 matching lines @@
   HeapHashSet<WeakMember<CSSStyleSheet>> m_loadingClients;
   HeapHashSet<WeakMember<CSSStyleSheet>> m_completedClients;
 
   Member<RuleSet> m_ruleSet;
   String m_sourceMapURL;
 };
 
 }  // namespace blink
 
 #endif