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diff --git a/chrome/browser/gpu_process_host_ui_shim.h b/chrome/browser/gpu_process_host_ui_shim.h
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+++ b/chrome/browser/gpu_process_host_ui_shim.h
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+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_GPU_PROCESS_HOST_UI_SHIM_H_
+#define CHROME_BROWSER_GPU_PROCESS_HOST_UI_SHIM_H_
+
+// This class lives on the UI thread and supports classes like the
+// BackingStoreProxy, which must live on the UI thread. The IO thread
+// portion of this class, the GpuProcessHost, is responsible for
+// shuttling messages between the browser and GPU processes.
+
+#include "base/singleton.h"
+#include "chrome/common/gpu_native_window_handle.h"
+#include "chrome/common/message_router.h"
+#include "ipc/ipc_channel.h"
+#include "gfx/native_widget_types.h"
+
+class GpuProcessHostUIShim : public IPC::Channel::Sender,
+                             public IPC::Channel::Listener {
+ public:
+  // Getter for the singleton. This will return NULL on failure.
+  static GpuProcessHostUIShim* Get();
+
+  int32 GetNextRoutingId();
+
+  // Creates the new remote view and returns the routing ID for the view, or 0
+  // on failure.
+  int32 NewRenderWidgetHostView(GpuNativeWindowHandle parent);
+
+  // IPC::Channel::Sender implementation.
+  virtual bool Send(IPC::Message* msg);
+
+  // IPC::Channel::Listener implementation.
+  // The GpuProcessHost causes this to be called on the UI thread to
+  // dispatch the incoming messages from the GPU process, which are
+  // actually received on the IO thread.
+  virtual void OnMessageReceived(const IPC::Message& message);
+
+  // See documentation on MessageRouter for AddRoute and RemoveRoute
+  void AddRoute(int32 routing_id, IPC::Channel::Listener* listener);
+  void RemoveRoute(int32 routing_id);
+
+ private:
+  friend struct DefaultSingletonTraits<GpuProcessHostUIShim>;
+
+  GpuProcessHostUIShim();
+  virtual ~GpuProcessHostUIShim();
+
+  int last_routing_id_;
+
+  MessageRouter router_;
+};
+
+#endif  // CHROME_BROWSER_GPU_PROCESS_HOST_UI_SHIM_H_
+