Oilpan: Prepare to move Resource to Oilpan heap.

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 35 matching lines @@
 class ResourcePtrBase;
 class ResourceFetcher;
 class InspectorResource;
 class ResourceLoader;
 class SecurityOrigin;
 class SharedBuffer;
 
 // A resource that is held in the cache. Classes who want to use this object should derive
 // from ResourceClient, to get the function calls in case the requested data has arrived.
 // This class also does the actual communication with the loader to obtain the resource from the network.
-class Resource {
-    WTF_MAKE_NONCOPYABLE(Resource); WTF_MAKE_FAST_ALLOCATED;
+class Resource : public NoBaseWillBeGarbageCollectedFinalized<Resource> {
+    WTF_MAKE_NONCOPYABLE(Resource); WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
     friend class InspectorResource;
 
 public:
     enum Type {
         MainResource,
         Image,
         CSSStyleSheet,
         Script,
         Font,
         Raw,
         SVGDocument,
         XSLStyleSheet,
         LinkPrefetch,
         LinkSubresource,
         TextTrack,
         ImportResource,
         Media // Audio or video file requested by a HTML5 media element
     };
 
     enum Status {
         Unknown, // let cache decide what to do with it
         Pending, // only partially loaded
         Cached, // regular case
         LoadError,
         DecodeError
     };
 
     Resource(const ResourceRequest&, Type);
+#if ENABLE(OILPAN)
     virtual ~Resource();
+#else
+protected:
+    // Only deleteIfPossible should delete this.
+    virtual ~Resource();
+public:
+#endif
     virtual void dispose();
+    virtual void trace(Visitor*);
 
     virtual void load(ResourceFetcher*, const ResourceLoaderOptions&);
 
     virtual void setEncoding(const String&) { }
     virtual String encoding() const { return String(); }
     virtual void appendData(const char*, int);
     virtual void error(Resource::Status);
 
     void setNeedsSynchronousCacheHit(bool needsSynchronousCacheHit) { m_needsSynchronousCacheHit = needsSynchronousCacheHit; }
 
@@ skipping 273 matching lines @@
     unsigned m_needsSynchronousCacheHit : 1;
 
 #ifdef ENABLE_RESOURCE_IS_DELETED_CHECK
     bool m_deleted;
 #endif
 
     // If this field is non-null we are using the resource as a proxy for checking whether an existing resource is still up to date
     // using HTTP If-Modified-Since/If-None-Match headers. If the response is 304 all clients of this resource are moved
     // to to be clients of m_resourceToRevalidate and the resource is deleted. If not, the field is zeroed and this
     // resources becomes normal resource load.
-    Resource* m_resourceToRevalidate;
+    RawPtrWillBeMember<Resource> m_resourceToRevalidate;
 
     // If this field is non-null, the resource has a proxy for checking whether it is still up to date (see m_resourceToRevalidate).
-    Resource* m_proxyResource;
+    RawPtrWillBeMember<Resource> m_proxyResource;
 
     // These handles will need to be updated to point to the m_resourceToRevalidate in case we get 304 response.
     HashSet<ResourcePtrBase*> m_handlesToRevalidate;
 
     // Ordered list of all redirects followed while fetching this resource.
     Vector<RedirectPair> m_redirectChain;
 };
 
 #if !LOG_DISABLED
 // Intended to be used in LOG statements.
 const char* ResourceTypeName(Resource::Type);
 #endif
 
 #define DEFINE_RESOURCE_TYPE_CASTS(typeName) \
     DEFINE_TYPE_CASTS(typeName##Resource, Resource, resource, resource->type() == Resource::typeName, resource.type() == Resource::typeName); \
     inline typeName##Resource* to##typeName##Resource(const ResourcePtr<Resource>& ptr) { return to##typeName##Resource(ptr.get()); }
 
 }
 
 #endif