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diff --git a/Source/WebKit2/Shared/mac/WebCoreArgumentCodersMac.mm b/Source/WebKit2/Shared/mac/WebCoreArgumentCodersMac.mm
new file mode 100644
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+++ b/Source/WebKit2/Shared/mac/WebCoreArgumentCodersMac.mm
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2010 Apple 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. AND ITS 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 APPLE INC. OR ITS 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.
+ */
+
+#include "WebCoreArgumentCoders.h"
+
+#include "ArgumentCodersCF.h"
+#include "WebKitSystemInterface.h"
+
+namespace CoreIPC {
+
+void encodeResourceRequest(ArgumentEncoder* encoder, const WebCore::ResourceRequest& resourceRequest)
+{
+    RetainPtr<CFDictionaryRef> dictionary(AdoptCF, WKNSURLRequestCreateSerializableRepresentation(resourceRequest.nsURLRequest(), CoreIPC::tokenNullTypeRef()));
+    encode(encoder, dictionary.get());
+}
+
+bool decodeResourceRequest(ArgumentDecoder* decoder, WebCore::ResourceRequest& resourceRequest)
+{
+    RetainPtr<CFDictionaryRef> dictionary;
+    if (!decode(decoder, dictionary))
+        return false;
+
+    NSURLRequest *nsURLRequest = WKNSURLRequestFromSerializableRepresentation(dictionary.get(), CoreIPC::tokenNullTypeRef());
+    if (!nsURLRequest)
+        return false;
+
+    resourceRequest = WebCore::ResourceRequest(nsURLRequest);
+    return true;
+}
+
+void encodeResourceResponse(ArgumentEncoder* encoder, const WebCore::ResourceResponse& resourceResponse)
+{
+    bool responseIsPresent = resourceResponse.nsURLResponse();
+    encoder->encode(responseIsPresent);
+
+    if (!responseIsPresent)
+        return;
+
+    RetainPtr<CFDictionaryRef> dictionary(AdoptCF, WKNSURLResponseCreateSerializableRepresentation(resourceResponse.nsURLResponse(), CoreIPC::tokenNullTypeRef()));
+    encode(encoder, dictionary.get());
+}
+
+bool decodeResourceResponse(ArgumentDecoder* decoder, WebCore::ResourceResponse& resourceResponse)
+{
+    bool responseIsPresent;
+    decoder->decode(responseIsPresent);
+
+    if (!responseIsPresent) {
+        resourceResponse = WebCore::ResourceResponse();
+        return true;
+    }
+
+    RetainPtr<CFDictionaryRef> dictionary;
+    if (!decode(decoder, dictionary))
+        return false;
+
+    NSURLResponse* nsURLResponse = WKNSURLResponseFromSerializableRepresentation(dictionary.get(), CoreIPC::tokenNullTypeRef());
+    if (!nsURLResponse)
+        return false;
+
+    resourceResponse = WebCore::ResourceResponse(nsURLResponse);
+    return true;
+}
+
+
+} // namespace CoreIPC