Add HTMLPreloadScanner support for <link rel=preload>

third_party/WebKit/Source/core/fetch/ResourceFetcher.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
     Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
 
     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
@@ skipping 305 matching lines @@
     resource->setDataBufferingPolicy(BufferData);
     if (data->size())
         resource->setResourceBuffer(data);
     resource->setIdentifier(createUniqueIdentifier());
     resource->setCacheIdentifier(cacheIdentifier);
     resource->finish();
     memoryCache()->add(resource.get());
     return resource;
 }
 
-void ResourceFetcher::moveCachedNonBlockingResourceToBlocking(Resource* resource)
+void ResourceFetcher::moveCachedNonBlockingResourceToBlocking(Resource* resource, const FetchRequest& request)
 {
     // TODO(yoav): Test that non-blocking resources (video/audio/track) continue to not-block even after being preloaded and discovered.
-    if (resource && resource->loader() && resource->isNonBlockingResourceType() && resource->avoidBlockingOnLoad()) {
+    if (resource && resource->loader() && resource->isNonBlockingResourceType() && resource->avoidBlockingOnLoad() && !request.forPreload()) {
         if (m_nonBlockingLoaders)
             m_nonBlockingLoaders->remove(resource->loader());
         if (!m_loaders)
             m_loaders = ResourceLoaderSet::create();
         m_loaders->add(resource->loader());
     }
 }
 
 ResourcePtr<Resource> ResourceFetcher::requestResource(FetchRequest& request, const ResourceFactory& factory, const SubstituteData& substituteData)
 {
@@ skipping 33 matching lines @@
     }
 
     bool isStaticData = request.resourceRequest().url().protocolIsData() || substituteData.isValid();
     ResourcePtr<Resource> resource;
     if (isStaticData)
         resource = preCacheData(request, factory, substituteData);
     if (!resource)
         resource = memoryCache()->resourceForURL(url, getCacheIdentifier());
 
     // See if we can use an existing resource from the cache. If so, we need to move it to be load blocking.
-    moveCachedNonBlockingResourceToBlocking(resource.get());
+    moveCachedNonBlockingResourceToBlocking(resource.get(), request);
 
     const RevalidationPolicy policy = determineRevalidationPolicy(factory.type(), request, resource.get(), isStaticData);
     switch (policy) {
     case Reload:
         memoryCache()->remove(resource.get());
         // Fall through
     case Load:
         resource = createResourceForLoading(request, request.charset(), factory);
         break;
     case Revalidate:
@@ skipping 760 matching lines @@
     visitor->trace(m_loaders);
     visitor->trace(m_nonBlockingLoaders);
 #if ENABLE(OILPAN)
     visitor->trace(m_documentResources);
     visitor->trace(m_preloads);
     visitor->trace(m_resourceTimingInfoMap);
 #endif
 }
 
 }