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diff --git a/app/win/hwnd_util.h b/app/win/hwnd_util.h
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+++ b/app/win/hwnd_util.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 APP_WIN_HWND_UTIL_H_
+#define APP_WIN_HWND_UTIL_H_
+#pragma once
+
+#include <windows.h>
+
+#include "base/string16.h"
+
+namespace app {
+namespace win {
+
+// A version of the GetClassNameW API that returns the class name in an
+// string16. An empty result indicates a failure to get the class name.
+string16 GetClassName(HWND hwnd);
+
+// Useful for subclassing a HWND.  Returns the previous window procedure.
+WNDPROC SetWindowProc(HWND hwnd, WNDPROC wndproc);
+
+// Pointer-friendly wrappers around Get/SetWindowLong(..., GWLP_USERDATA, ...)
+// Returns the previously set value.
+void* SetWindowUserData(HWND hwnd, void* user_data);
+void* GetWindowUserData(HWND hwnd);
+
+}  // namespace win
+}  // namespace app
+
+#endif  // APP_WIN_HWND_UTIL_H_