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diff --git a/sandbox/src/Wow64.h b/sandbox/src/Wow64.h
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+// Copyright 2008, 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 SANDBOX_SRC_WOW64_H__
+#define SANDBOX_SRC_WOW64_H__
+
+#include <windows.h>
+
+#include "base/basictypes.h"
+#include "sandbox/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), init_(false), 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(DWORD timeout_ms);
+
+  // Returns true if this is a 32 bit process running on a 64 bit OS.
+  bool IsWow64();
+
+ private:
+  // Runs the WOW helper process, passing the address of a buffer allocated on
+  // the child (one page).
+  bool RunWowHelper(void* buffer, DWORD timeout_ms);
+
+  // This method receives "notifications" whenever a DLL is mapped on the child.
+  bool DllMapped(DWORD timeout_ms);
+
+  // 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.
+  bool init_;             // Initialization control.
+  bool is_wow64_;         // true on WOW64 environments.
+  DISALLOW_IMPLICIT_CONSTRUCTORS(Wow64);
+};
+
+}  // namespace sandbox
+
+#endif  // SANDBOX_SRC_WOW64_H__