Current work-in-progress crbug.com/567021

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 73 matching lines @@
     Document* singleOwnerDocument() 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; }
 
-    void setHasFontFaceRule(bool b) { m_hasFontFaceRule = b; }
+    void setHasFontFaceRule() { m_hasFontFaceRule = true; }
     bool hasFontFaceRule() const { return m_hasFontFaceRule; }
     void findFontFaceRules(HeapVector<Member<const StyleRuleFontFace>>& fontFaceRules);
 
+    void setHasViewportRule() { m_hasViewportRule = true; }
+    bool hasViewportRule() const { return m_hasViewportRule; }
+
     void parserAddNamespace(const AtomicString& prefix, const AtomicString& uri);
     void parserAppendRule(StyleRuleBase*);
 
     void clearRules();
 
     // Rules other than @import.
     const HeapVector<Member<StyleRuleBase>>& childRules() const { return m_childRules; }
     const HeapVector<Member<StyleRuleImport>>& importRules() const { return m_importRules; }
     const HeapVector<Member<StyleRuleNamespace>>& namespaceRules() const { return m_namespaceRules; }
 
@@ skipping 38 matching lines @@
     void setReferencedFromResource(CSSStyleSheetResource*);
     void clearReferencedFromResource();
 
     void setHasMediaQueries();
     bool hasMediaQueries() const { return m_hasMediaQueries; }
 
     bool didLoadErrorOccur() const { return m_didLoadErrorOccur; }
 
     RuleSet& ruleSet() { ASSERT(m_ruleSet); return *m_ruleSet.get(); }
     RuleSet& ensureRuleSet(const MediaQueryEvaluator&, AddRuleFlags);
+    RuleSet& ensureEmptyRuleSet();
     void clearRuleSet();
 
     String sourceMapURL() const { return m_sourceMapURL; }
 
     DECLARE_TRACE();
 
 private:
     StyleSheetContents(StyleRuleImport* ownerRule, const String& originalURL, const CSSParserContext&);
     StyleSheetContents(const StyleSheetContents&);
     StyleSheetContents() = delete;
@@ skipping 11 matching lines @@
     HeapVector<Member<StyleRuleBase>> m_childRules;
     using PrefixNamespaceURIMap = HashMap<AtomicString, AtomicString>;
     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_hasViewportRule : 1;
     bool m_hasMediaQueries : 1;
     bool m_hasSingleOwnerDocument : 1;
 
     CSSParserContext m_parserContext;
 
     HeapHashSet<WeakMember<CSSStyleSheet>> m_loadingClients;
     HeapHashSet<WeakMember<CSSStyleSheet>> m_completedClients;
 
     Member<RuleSet> m_ruleSet;
     String m_sourceMapURL;
 };
 
 } // namespace blink
 
 #endif