Report the size of |CSSStyleSheetResource::m_decodedSheetText| as decoded size

third_party/WebKit/Source/core/fetch/CSSStyleSheetResource.h

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007, 2008 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 62 matching lines @@
                         const ResourceLoaderOptions&,
                         const String& charset);
 
   bool canUseSheet(MIMETypeCheck) const;
   void checkNotify() override;
 
   void setParsedStyleSheetCache(StyleSheetContents*);
 
   void destroyDecodedDataIfPossible() override;
   void destroyDecodedDataForFailedRevalidation() override;
+  void updateDecodedSize();
 
   // Decoded sheet text cache is available iff loading this CSS resource is
   // successfully complete.
   String m_decodedSheetText;
 
   Member<StyleSheetContents> m_parsedStyleSheetCache;
 
   bool m_didNotifyFirstData;
 };
 
 DEFINE_RESOURCE_TYPE_CASTS(CSSStyleSheet);
 
 }  // namespace blink
 
 #endif