Don't wait for AppCache for link rel preloads

third_party/WebKit/Source/core/loader/LinkLoader.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 57 matching lines @@
     void didStartPrerender() override;
     void didStopPrerender() override;
     void didSendLoadForPrerender() override;
     void didSendDOMContentLoadedForPrerender() override;
 
     void triggerEvents(const Resource*);
 
     void released();
     bool loadLink(const LinkRelAttribute&, CrossOriginAttributeValue, const String& type, const String& as, const String& media, const KURL&, Document&, const NetworkHintsInterface&);
     enum CanLoadResources { OnlyLoadResources, DoNotLoadResources, LoadResourcesAndPreconnect };
-    static void loadLinksFromHeader(const String& headerValue, const KURL& baseURL, Document*, const NetworkHintsInterface&, CanLoadResources, ViewportDescriptionWrapper*);
+    // Media links cannot be preloaded until the first chunk is parsed. The rest
+    // can be preloaded at commit time.
+    enum MediaPreloadPolicy { LoadAll, OnlyLoadNonMedia, OnlyLoadMedia };
+    static void loadLinksFromHeader(const String& headerValue, const KURL& baseURL, Document*, const NetworkHintsInterface&, CanLoadResources, MediaPreloadPolicy, ViewportDescriptionWrapper*);
     static bool getResourceTypeFromAsAttribute(const String& as, Resource::Type&);
 
     DECLARE_TRACE();
 
 private:
     explicit LinkLoader(LinkLoaderClient*);
 
     void linkLoadTimerFired(Timer<LinkLoader>*);
     void linkLoadingErrorTimerFired(Timer<LinkLoader>*);
     void createLinkPreloadResourceClient(Resource*);
 
     Member<LinkLoaderClient> m_client;
 
     Timer<LinkLoader> m_linkLoadTimer;
     Timer<LinkLoader> m_linkLoadingErrorTimer;
 
     Member<PrerenderHandle> m_prerender;
     Member<LinkPreloadResourceClient> m_linkPreloadResourceClient;
 };
 
 } // namespace blink
 
 #endif