Move RefCountedSupplement to platform/

Source/core/platform/RefCountedSupplement.h

-/*
- * Copyright (C) 2012 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:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef RefCountedSupplement_h
-#define RefCountedSupplement_h
-
-#include "platform/Supplementable.h"
-#include "wtf/RefCounted.h"
-#include "wtf/RefPtr.h"
-
-namespace WebCore {
-
-template<class T, class S>
-class RefCountedSupplement : public RefCounted<S> {
-public:
-    typedef RefCountedSupplement<T, S> ThisType;
-
-    virtual ~RefCountedSupplement() { }
-    virtual void hostDestroyed() { }
-
-    class Wrapper : public Supplement<T> {
-    public:
-        explicit Wrapper(PassRefPtr<ThisType> wrapped) : m_wrapped(wrapped) { }
-        virtual ~Wrapper() { m_wrapped->hostDestroyed();  }
-#if !ASSERT_DISABLED || defined(ADDRESS_SANITIZER)
-        virtual bool isRefCountedWrapper() const OVERRIDE { return true; }
-#endif
-        ThisType* wrapped() const { return m_wrapped.get(); }
-    private:
-
-        RefPtr<ThisType> m_wrapped;
-    };
-
-    static void provideTo(Supplementable<T>* host, const char* key, PassRefPtr<ThisType> supplement)
-    {
-        host->provideSupplement(key, adoptPtr(new Wrapper(supplement)));
-    }
-
-    static ThisType* from(Supplementable<T>* host, const char* key)
-    {
-        Supplement<T>* found = host->requireSupplement(key);
-        if (!found)
-            return 0;
-        ASSERT_WITH_SECURITY_IMPLICATION(found->isRefCountedWrapper());
-        return static_cast<Wrapper*>(found)->wrapped();
-    }
-};
-
-} // namespace WebCore
-
-#endif // RefCountedSupplement_h