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diff --git a/sandbox/win/src/Wow64.h b/sandbox/win/src/Wow64.h
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+++ b/sandbox/win/src/Wow64.h
@@ -0,0 +1,50 @@
+// Copyright (c) 2011 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 SANDBOX_SRC_WOW64_H__
+#define SANDBOX_SRC_WOW64_H__
+
+#include <windows.h>
+
+#include "base/basictypes.h"
+#include "sandbox/win/src/sandbox_types.h"
+
+namespace sandbox {
+
+class TargetProcess;
+
+// This class wraps the code needed to interact with the Windows On Windows
+// subsystem on 64 bit OSes, from the point of view of interceptions.
+class Wow64 {
+ public:
+  Wow64(TargetProcess* child, HMODULE ntdll)
+      : child_(child), ntdll_(ntdll), dll_load_(NULL), continue_load_(NULL) {}
+  ~Wow64();
+
+  // Waits for the 32 bit DLL to get loaded on the child process. This function
+  // will return immediately if not running under WOW, or launch the helper
+  // process and wait until ntdll is ready.
+  bool WaitForNtdll();
+
+ private:
+  // Runs the WOW helper process, passing the address of a buffer allocated on
+  // the child (one page).
+  bool RunWowHelper(void* buffer);
+
+  // This method receives "notifications" whenever a DLL is mapped on the child.
+  bool DllMapped();
+
+  // Returns true if ntdll.dll is mapped on the child.
+  bool NtdllPresent();
+
+  TargetProcess* child_;  // Child process.
+  HMODULE ntdll_;         // ntdll on the parent.
+  HANDLE dll_load_;       // Event that is signaled on dll load.
+  HANDLE continue_load_;  // Event to signal to continue execution on the child.
+  DISALLOW_IMPLICIT_CONSTRUCTORS(Wow64);
+};
+
+}  // namespace sandbox
+
+#endif  // SANDBOX_SRC_WOW64_H__