Create a "GetWOW64Status()" utility function and make the rest of the codebas...

base/win/windows_version.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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 BASE_WIN_WINDOWS_VERSION_H_
 #define BASE_WIN_WINDOWS_VERSION_H_
 #pragma once
 
+typedef void* HANDLE;
+
 namespace base {
 namespace win {
 
 // NOTE: Keep these in order so callers can do things like
 // "if (GetWinVersion() > WINVERSION_2000) ...".  It's OK to change the values,
 // though.
 enum Version {
   VERSION_PRE_2000 = 0,  // Not supported
   VERSION_2000 = 1,      // Not supported
   VERSION_XP = 2,
   VERSION_SERVER_2003 = 3,
   VERSION_VISTA = 4,
   VERSION_2008 = 5,
   VERSION_WIN7 = 6,
 };
 
 // Returns the running version of Windows.
 Version GetVersion();
 
 // Returns the major and minor version of the service pack installed.
 void GetServicePackLevel(int* major, int* minor);
 
+enum WOW64Status {
+  WOW64_DISABLED,
+  WOW64_ENABLED,
+  WOW64_UNKNOWN,
+};
+
+// Returns whether this process is running under WOW64 (the wrapper that allows
+// 32-bit processes to run on 64-bit versions of Windows).  This will return
+// WOW64_DISABLED for both "32-bit Chrome on 32-bit Windows" and "64-bit Chrome
+// on 64-bit Windows".  WOW64_UNKNOWN means "an error occurred", e.g. the
+// process does not have sufficient access rights to determine this.
+WOW64Status GetWOW64Status();
+
+// Like GetWOW64Status(), but for the supplied handle instead of the current
+// process.
+WOW64Status GetWOW64StatusForHandle(HANDLE handle);

[brettw, 2011/03/03 22:28:53]

Maybe call this process_handle to make more clear what it's suppose to be a
handle for?

[Peter Kasting, 2011/03/03 22:33:23]

I went one better than this and also changed the API name to
GetWOW64StatusForProcess() and the calling code in memory_details_win.cc from
using |handle| to using |process_handle|.

+
 }  // namespace win
 }  // namespace base
 
 #endif  // BASE_WIN_WINDOWS_VERSION_H_