Preload scan external CSS for @import

third_party/WebKit/Source/core/fetch/ResourceOwner.h

 /*
  * 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 58 matching lines @@
         visitor->trace(m_resource);
         ResourceOwnerBase<C, std::is_base_of<GarbageCollectedMixin, C>::value>::trace(visitor);
     }
 
 protected:
     ResourceOwner()
     {
         ThreadState::current()->registerPreFinalizer(this);
     }
 
-    void setResource(ResourceType*);
+    void setResource(ResourceType*, Resource::PreloadReferencePolicy = Resource::MarkAsReferenced);
     void clearResource() { setResource(nullptr); }
 
 private:
     Member<ResourceType> m_resource;
 };
 
 template<class R, class C>
-inline void ResourceOwner<R, C>::setResource(R* newResource)
+inline void ResourceOwner<R, C>::setResource(R* newResource, Resource::PreloadReferencePolicy preloadReferencePolicy)
 {
     if (newResource == m_resource)
         return;
 
     // Some ResourceClient implementations reenter this so
     // we need to prevent double removal.
     if (ResourceType* oldResource = m_resource.release())
         oldResource->removeClient(this);
 
     if (newResource) {
         m_resource = newResource;
-        m_resource->addClient(this);
+        m_resource->addClient(this, preloadReferencePolicy);
     }
 }
 
 } // namespace blink
 
 #endif