Preload scan external CSS for @import

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

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
 
     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
     version 2 of the License, or (at your option) any later version.
@@ skipping 68 matching lines @@
     static const int kLastResourceType = Manifest + 1;
 
     enum Status {
         NotStarted,
         Pending, // load in progress
         Cached, // load completed successfully
         LoadError,
         DecodeError
     };
 
+    // Whether a resource client for a preload should mark the preload as
+    // referenced.
+    enum PreloadReferencePolicy {
+        MarkAsReferenced,
+        DontMarkAsReferenced,
+    };
+
     // Exposed for testing.
     static Resource* create(const ResourceRequest& request, Type type, const ResourceLoaderOptions& options = ResourceLoaderOptions())
     {
         return new Resource(request, type, options);
     }
     virtual ~Resource();
 
     DECLARE_VIRTUAL_TRACE();
 
     virtual void setEncoding(const String&) { }
@@ skipping 25 matching lines @@
 
     // This url can have a fragment, but it can match resources that differ by the fragment only.
     const KURL& url() const { return m_resourceRequest.url();}
     Type getType() const { return static_cast<Type>(m_type); }
     const ResourceLoaderOptions& options() const { return m_options; }
     ResourceLoaderOptions& mutableOptions() { return m_options; }
 
     void didChangePriority(ResourceLoadPriority, int intraPriorityValue);
     virtual ResourcePriority priorityFromObservers() { return ResourcePriority(); }
 
-    void addClient(ResourceClient*);
+    // The reference policy indicates that the client should not affect whether
+    // a preload is considered referenced or not. This allows for "passive"
+    // resource clients that simply observe the resource.
+    void addClient(ResourceClient*, PreloadReferencePolicy = MarkAsReferenced);
     void removeClient(ResourceClient*);
     virtual bool hasClientsOrObservers() const { return !m_clients.isEmpty() || !m_clientsAwaitingCallback.isEmpty() || !m_finishedClients.isEmpty(); }
 
     enum PreloadResult {
         PreloadNotReferenced,
         PreloadReferenced,
         PreloadReferencedWhileLoading,
         PreloadReferencedWhileComplete
     };
     PreloadResult getPreloadResult() const { return static_cast<PreloadResult>(m_preloadResult); }
@@ skipping 106 matching lines @@
 
     virtual void destroyDecodedDataForFailedRevalidation() { }
 
     void setEncodedSize(size_t);
     void setDecodedSize(size_t);
     void didAccessDecodedData();
 
     void finishPendingClients();
 
     virtual void didAddClient(ResourceClient*);
-    void willAddClientOrObserver();
+    void willAddClientOrObserver(PreloadReferencePolicy);
 
     // |this| object may be dead after didRemoveClientOrObserver().
     void didRemoveClientOrObserver();
     virtual void allClientsAndObserversRemoved();
 
     bool hasClient(ResourceClient* client) { return m_clients.contains(client) || m_clientsAwaitingCallback.contains(client) || m_finishedClients.contains(client); }
 
     struct RedirectPair {
         DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
     public:
@@ skipping 99 matching lines @@
 
     Resource::Type m_type;
 };
 
 #define DEFINE_RESOURCE_TYPE_CASTS(typeName) \
     DEFINE_TYPE_CASTS(typeName##Resource, Resource, resource, resource->getType() == Resource::typeName, resource.getType() == Resource::typeName);
 
 } // namespace blink
 
 #endif