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diff --git a/Source/WebCore/platform/CrossThreadCopier.h b/Source/WebCore/platform/CrossThreadCopier.h
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+/*
+ * Copyright (C) 2009, 2010 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
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 THE COPYRIGHT
+ * OWNER 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 CrossThreadCopier_h
+#define CrossThreadCopier_h
+
+#include <wtf/Forward.h>
+#include <wtf/PassOwnPtr.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefPtr.h>
+#include <wtf/Threading.h>
+#include <wtf/TypeTraits.h>
+
+namespace WebCore {
+
+    class KURL;
+    class ResourceError;
+    class ResourceRequest;
+    class ResourceResponse;
+    struct CrossThreadResourceResponseData;
+    struct CrossThreadResourceRequestData;
+    struct ThreadableLoaderOptions;
+
+    template<typename T> struct CrossThreadCopierPassThrough {
+        typedef T Type;
+        static Type copy(const T& parameter)
+        {
+            return parameter;
+        }
+    };
+
+    template<bool isConvertibleToInteger, bool isThreadsafeShared, typename T> struct CrossThreadCopierBase;
+
+    // Integers get passed through without any changes.
+    template<typename T> struct CrossThreadCopierBase<true, false, T> : public CrossThreadCopierPassThrough<T> {
+    };
+
+    // Pointers get passed through without any significant changes.
+    template<typename T> struct CrossThreadCopierBase<false, false, T*> : public CrossThreadCopierPassThrough<T*> {
+    };
+
+    template<> struct CrossThreadCopierBase<false, false, ThreadableLoaderOptions> : public CrossThreadCopierPassThrough<ThreadableLoaderOptions> {
+    };
+
+    // Custom copy methods.
+    template<typename T> struct CrossThreadCopierBase<false, true, T> {
+        typedef typename WTF::RemoveTemplate<T, RefPtr>::Type TypeWithoutRefPtr;
+        typedef typename WTF::RemoveTemplate<TypeWithoutRefPtr, PassRefPtr>::Type RefCountedType;
+        typedef PassRefPtr<RefCountedType> Type;
+        static Type copy(const T& refPtr)
+        {
+            return refPtr.get();
+        }
+    };
+
+    template<typename T> struct CrossThreadCopierBase<false, false, PassOwnPtr<T> > {
+        typedef PassOwnPtr<T> Type;
+        static Type copy(Type ownPtr)
+        {
+            return ownPtr;
+        }
+    };
+
+    template<> struct CrossThreadCopierBase<false, false, KURL> {
+        typedef KURL Type;
+        static Type copy(const KURL&);
+    };
+
+    template<> struct CrossThreadCopierBase<false, false, String> {
+        typedef String Type;
+        static Type copy(const String&);
+    };
+
+    template<> struct CrossThreadCopierBase<false, false, ResourceError> {
+        typedef ResourceError Type;
+        static Type copy(const ResourceError&);
+    };
+
+    template<> struct CrossThreadCopierBase<false, false, ResourceRequest> {
+        typedef PassOwnPtr<CrossThreadResourceRequestData> Type;
+        static Type copy(const ResourceRequest&);
+    };
+
+    template<> struct CrossThreadCopierBase<false, false, ResourceResponse> {
+        typedef PassOwnPtr<CrossThreadResourceResponseData> Type;
+        static Type copy(const ResourceResponse&);
+    };
+
+    template<typename T> struct CrossThreadCopier : public CrossThreadCopierBase<WTF::IsConvertibleToInteger<T>::value,
+                                                                                 WTF::IsSubclassOfTemplate<typename WTF::RemoveTemplate<T, RefPtr>::Type, ThreadSafeShared>::value
+                                                                                     || WTF::IsSubclassOfTemplate<typename WTF::RemoveTemplate<T, PassRefPtr>::Type, ThreadSafeShared>::value,
+                                                                                 T> {
+    };
+
+} // namespace WebCore
+
+#endif // CrossThreadCopier_h