Move inline stylesheet cache decision making from StyleSheetContents to StyleEngine

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 53 matching lines @@
 
     const CSSParserContext& parserContext() const { return m_parserContext; }
 
     const AtomicString& determineNamespace(const AtomicString& prefix);
 
     void parseAuthorStyleSheet(const CSSStyleSheetResource*, const SecurityOrigin*);
     bool parseString(const String&);
     bool parseStringAtPosition(const String&, const TextPosition&, bool);
 
     bool isCacheable() const;
-    bool maybeCacheable() const;
 
     bool isLoading() const;
 
     void checkLoaded();
     void startLoadingDynamicSheet();
 
     StyleSheetContents* rootStyleSheet() const;
     bool hasSingleOwnerNode() const;
     Node* singleOwnerNode() const;
     Document* singleOwnerDocument() const;
@@ skipping 62 matching lines @@
     bool isMutable() const { return m_isMutable; }
     void setMutable() { m_isMutable = true; }
 
     void removeSheetFromCache(Document*);
 
     bool isInMemoryCache() const { return m_isInMemoryCache; }
     void addedToMemoryCache();
     void removedFromMemoryCache();
 
     void setHasMediaQueries();
-    bool hasMediaQueries() { return m_hasMediaQueries; }
+    bool hasMediaQueries() const { return m_hasMediaQueries; }
+
+    bool didLoadErrorOccur() const { return m_didLoadErrorOccur; }
 
     void shrinkToFit();
     RuleSet& ruleSet() { ASSERT(m_ruleSet); return *m_ruleSet.get(); }
     RuleSet& ensureRuleSet(const MediaQueryEvaluator&, AddRuleFlags);
     void clearRuleSet();
 
     void trace(Visitor*);
 
 private:
     StyleSheetContents(StyleRuleImport* ownerRule, const String& originalURL, const CSSParserContext&);
@@ skipping 27 matching lines @@
     WillBeHeapHashSet<RawPtrWillBeWeakMember<CSSStyleSheet> > m_loadingClients;
     WillBeHeapHashSet<RawPtrWillBeWeakMember<CSSStyleSheet> > m_completedClients;
     typedef WillBeHeapHashSet<RawPtrWillBeWeakMember<CSSStyleSheet> >::iterator ClientsIterator;
 
     OwnPtrWillBeMember<RuleSet> m_ruleSet;
 };
 
 } // namespace
 
 #endif