Fix link header preload on subresources

third_party/WebKit/Source/core/loader/FrameFetchContext.cpp

 /*
  * Copyright (C) 2013 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 232 matching lines @@
 void FrameFetchContext::dispatchWillSendRequest(unsigned long identifier, ResourceRequest& request, const ResourceResponse& redirectResponse, const FetchInitiatorInfo& initiatorInfo)
 {
     frame()->loader().applyUserAgent(request);
     frame()->loader().client()->dispatchWillSendRequest(m_documentLoader, identifier, request, redirectResponse);
     TRACE_EVENT_INSTANT1("devtools.timeline", "ResourceSendRequest", TRACE_EVENT_SCOPE_THREAD, "data", InspectorSendRequestEvent::data(identifier, frame(), request));
     InspectorInstrumentation::willSendRequest(frame(), identifier, ensureLoaderForNotifications(), request, redirectResponse, initiatorInfo);
 }
 
 void FrameFetchContext::dispatchDidReceiveResponse(unsigned long identifier, const ResourceResponse& response, ResourceLoader* resourceLoader)
 {
+    LinkLoader::CanLoadResources resourceLoadingPolicy = LinkLoader::LoadResourcesAndPreconnect;
     MixedContentChecker::checkMixedPrivatePublic(frame(), response.remoteIPAddress());
-    LinkLoader::loadLinkFromHeader(response.httpHeaderField(HTTPNames::Link), frame()->document(), NetworkHintsInterfaceImpl(), LinkLoader::DoNotLoadResources);
     if (m_documentLoader == frame()->loader().provisionalDocumentLoader()) {
         ResourceFetcher* fetcher = nullptr;
         if (frame()->document())
             fetcher = frame()->document()->fetcher();
         m_documentLoader->clientHintsPreferences().updateFromAcceptClientHintsHeader(response.httpHeaderField(HTTPNames::Accept_CH), fetcher);
+        // When response is received with a provisional docloader, the resource haven't committed yet, and we cannot load resources, only preconnect.
+        resourceLoadingPolicy = LinkLoader::DoNotLoadResources;
     }
+    LinkLoader::loadLinkFromHeader(response.httpHeaderField(HTTPNames::Link), frame()->document(), NetworkHintsInterfaceImpl(), resourceLoadingPolicy);
 
     if (response.hasMajorCertificateErrors() && resourceLoader)
         MixedContentChecker::handleCertificateError(frame(), resourceLoader->originalRequest(), response);
 
     frame()->loader().progress().incrementProgress(identifier, response);
     frame()->loader().client()->dispatchDidReceiveResponse(m_documentLoader, identifier, response);
     TRACE_EVENT_INSTANT1("devtools.timeline", "ResourceReceiveResponse", TRACE_EVENT_SCOPE_THREAD, "data", InspectorReceiveResponseEvent::data(identifier, frame(), response));
     DocumentLoader* documentLoader = ensureLoaderForNotifications();
     InspectorInstrumentation::didReceiveResourceResponse(frame(), identifier, documentLoader, response, resourceLoader);
     // It is essential that inspector gets resource response BEFORE console.
@@ skipping 512 matching lines @@
 }
 
 DEFINE_TRACE(FrameFetchContext)
 {
     visitor->trace(m_document);
     visitor->trace(m_documentLoader);
     FetchContext::trace(visitor);
 }
 
 } // namespace blink