Implement updateViaCache flag and no-cache by default for main service worker scripts

third_party/WebKit/Source/core/html/HTMLLinkElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google 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 46 matching lines @@
   const AtomicString& rel() const;
   String media() const { return m_media; }
   String typeValue() const { return m_type; }
   String asValue() const { return m_as; }
   ReferrerPolicy referrerPolicy() const { return m_referrerPolicy; }
   const LinkRelAttribute& relAttribute() const { return m_relAttribute; }
   DOMTokenList& relList() const {
     return static_cast<DOMTokenList&>(*m_relList);
   }
   String scope() const { return m_scope; }
+  bool useCache() const { return m_useCache; }
 
   const AtomicString& type() const;
 
   IconType getIconType() const;
 
   // the icon sizes as parsed from the HTML attribute
   const Vector<IntSize>& iconSizes() const;
 
   bool async() const;
 
@@ skipping 77 matching lines @@
 
   String m_type;
   String m_as;
   String m_media;
   ReferrerPolicy m_referrerPolicy;
   Member<DOMTokenList> m_sizes;
   Vector<IntSize> m_iconSizes;
   TraceWrapperMember<RelList> m_relList;
   LinkRelAttribute m_relAttribute;
   String m_scope;
+  bool m_useCache;
 
   bool m_createdByParser;
 };
 
 }  // namespace blink
 
 #endif  // HTMLLinkElement_h