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

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

Index: third_party/WebKit/Source/core/loader/LinkLoader.h
diff --git a/third_party/WebKit/Source/core/loader/LinkLoader.h b/third_party/WebKit/Source/core/loader/LinkLoader.h
index ce5b48ff037870d170b67325099435ab24b73795..56012a748f2dc04dcfdc3e92f2d4beb79c01c6fa 100644
--- a/third_party/WebKit/Source/core/loader/LinkLoader.h
+++ b/third_party/WebKit/Source/core/loader/LinkLoader.h
@@ -36,6 +36,7 @@
 #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"
@@ -69,6 +70,8 @@ public:
     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 };
@@ -82,6 +85,7 @@ private:
 
     void linkLoadTimerFired(Timer<LinkLoader>*);
     void linkLoadingErrorTimerFired(Timer<LinkLoader>*);
+    void createLinkPreloadResourceClient(ResourcePtr<Resource>);
 
     LinkLoaderClient* m_client;
 
@@ -89,6 +93,7 @@ private:
     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.

 };
 
 }