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

base/win/windows_version.h

Index: base/win/windows_version.h
===================================================================
--- base/win/windows_version.h	(revision 76445)
+++ base/win/windows_version.h	(working copy)
@@ -1,4 +1,4 @@
-// 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.
 
@@ -6,6 +6,8 @@
 #define BASE_WIN_WINDOWS_VERSION_H_
 #pragma once
 
+typedef void* HANDLE;
+
 namespace base {
 namespace win {
 
@@ -28,6 +30,23 @@
 // 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