Add <link rel=preload> onload support for scripts and styles

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 18 matching lines @@
  *
  */
 
 #ifndef LinkLoader_h
 #define LinkLoader_h
 
 #include "core/CoreExport.h"
 #include "core/fetch/ResourceClient.h"
 #include "core/fetch/ResourceOwner.h"
 #include "core/loader/LinkLoaderClient.h"
+#include "core/loader/LinkPreloadResourceClients.h"
 #include "platform/CrossOriginAttributeValue.h"
 #include "platform/PrerenderClient.h"
 #include "platform/Timer.h"
 #include "platform/heap/Handle.h"
 #include "wtf/OwnPtr.h"
 
 namespace blink {
 
 class Document;
 class LinkRelAttribute;
@@ skipping 13 matching lines @@
     // from ResourceClient
     void notifyFinished(Resource*) override;
     String debugName() const override { return "LinkLoader"; }
 
     // from PrerenderClient
     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 KURL&, Document&, const NetworkHintsInterface&);
     enum CanLoadResources { LoadResources, DoNotLoadResources };
     static bool loadLinkFromHeader(const String& headerValue, Document*, const NetworkHintsInterface&, CanLoadResources);
     static Resource::Type getTypeFromAsAttribute(const String& as, Document*);
 
     DECLARE_TRACE();
 
 private:
     explicit LinkLoader(LinkLoaderClient*);
 
     void linkLoadTimerFired(Timer<LinkLoader>*);
     void linkLoadingErrorTimerFired(Timer<LinkLoader>*);
+    void createLinkPreloadResourceClient(ResourcePtr<Resource>);
 
     LinkLoaderClient* m_client;
 
     Timer<LinkLoader> m_linkLoadTimer;
     Timer<LinkLoader> m_linkLoadingErrorTimer;
 
     OwnPtrWillBeMember<PrerenderHandle> m_prerender;
+    OwnPtrWillBeMember<LinkPreloadResourceClient> m_linkPreloadResourceClient;

[sof, 2016/01/20 12:22:53]

This is another reason why LinkPreloadResourceClient needs to be a GC mixin --
so that you can correctly trace it from this class.

 };
 
 }
 
 #endif