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diff --git a/WebKit/chromium/src/PlatformMessagePortChannel.h b/WebKit/chromium/src/PlatformMessagePortChannel.h
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+++ b/WebKit/chromium/src/PlatformMessagePortChannel.h
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+/*
+ * Copyright (C) 2009 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 PlatformMessagePortChannel_h
+#define PlatformMessagePortChannel_h
+
+// FIXME: This relative path is a temporary hack to support using this
+// header from webkit/glue.
+#include "../public/WebMessagePortChannelClient.h"
+
+#include "MessagePortChannel.h"
+
+#include <wtf/PassRefPtr.h>
+#include <wtf/Threading.h>
+
+namespace WebKit {
+class WebMessagePortChannel;
+}
+
+namespace WebCore {
+
+class MessagePort;
+
+// PlatformMessagePortChannel is a platform-dependent interface to the remote side of a message channel.
+class PlatformMessagePortChannel : public ThreadSafeShared<PlatformMessagePortChannel>,
+                                   public WebKit::WebMessagePortChannelClient {
+public:
+    static void createChannel(PassRefPtr<MessagePort>, PassRefPtr<MessagePort>);
+    static PassRefPtr<PlatformMessagePortChannel> create();
+    static PassRefPtr<PlatformMessagePortChannel> create(WebKit::WebMessagePortChannel*);
+
+    // APIs delegated from MessagePortChannel.h
+    bool entangleIfOpen(MessagePort*);
+    void disentangle();
+    void postMessageToRemote(PassOwnPtr<MessagePortChannel::EventData>);
+    bool tryGetMessageFromRemote(OwnPtr<MessagePortChannel::EventData>&);
+    void close();
+    bool isConnectedTo(MessagePort* port);
+    bool hasPendingActivity();
+
+    // Releases ownership of the contained web channel.
+    WebKit::WebMessagePortChannel* webChannelRelease();
+
+    ~PlatformMessagePortChannel();
+
+private:
+    PlatformMessagePortChannel();
+    PlatformMessagePortChannel(WebKit::WebMessagePortChannel*);
+
+    void setEntangledChannel(PassRefPtr<PlatformMessagePortChannel>);
+
+    // WebKit::WebMessagePortChannelClient implementation
+    virtual void messageAvailable();
+
+    // Mutex used to ensure exclusive access to the object internals.
+    Mutex m_mutex;
+
+    // Pointer to our entangled pair - cleared when close() is called.
+    RefPtr<PlatformMessagePortChannel> m_entangledChannel;
+
+    // The port we are connected to - this is the port that is notified when new messages arrive.
+    MessagePort* m_localPort;
+
+    WebKit::WebMessagePortChannel* m_webChannel;
+};
+
+} // namespace WebCore
+
+#endif // PlatformMessagePortChannel_h