Add WOW64 support to the installer registry work items

chrome/installer/util/registry_key_backup.cc

 // 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.
 
 #include "chrome/installer/util/registry_key_backup.h"
 
 #include <algorithm>
 #include <map>
 #include <utility>
 #include <vector>
@@ skipping 253 matching lines @@
 
   return true;
 }
 
 RegistryKeyBackup::RegistryKeyBackup() {
 }
 
 RegistryKeyBackup::~RegistryKeyBackup() {
 }
 
-bool RegistryKeyBackup::Initialize(HKEY root, const wchar_t* key_path) {
+bool RegistryKeyBackup::Initialize(HKEY root,
+                                   const wchar_t* key_path,
+                                   REGSAM wow64_access) {
   DCHECK(key_path);
+  DCHECK(wow64_access == 0 ||
+         wow64_access == KEY_WOW64_32KEY ||
+         wow64_access == KEY_WOW64_64KEY);
 
   RegKey key;
   scoped_ptr<KeyData> key_data;
 
   // Does the key exist?
-  LONG result = key.Open(root, key_path, kKeyReadNoNotify);
+  LONG result = key.Open(root, key_path, kKeyReadNoNotify | wow64_access);
   if (result == ERROR_SUCCESS) {
     key_data.reset(new KeyData());
     if (!key_data->Initialize(key)) {
       LOG(ERROR) << "Failed to backup key at " << key_path;
       return false;
     }
   } else if (result != ERROR_FILE_NOT_FOUND) {
     LOG(ERROR) << "Failed to open key at " << key_path
                << " to create backup, result: " << result;
     return false;
   }
 
   key_data_.swap(key_data);
   return true;
 }
 
-bool RegistryKeyBackup::WriteTo(HKEY root, const wchar_t* key_path) const {
+bool RegistryKeyBackup::WriteTo(HKEY root,
+                                const wchar_t* key_path,
+                                REGSAM wow64_access) const {
   DCHECK(key_path);
+  DCHECK(wow64_access == 0 ||
+         wow64_access == KEY_WOW64_32KEY ||
+         wow64_access == KEY_WOW64_64KEY);
 
   bool success = false;
 
   if (key_data_.get() != NULL) {
     RegKey dest_key;
-    LONG result = dest_key.Create(root, key_path, KEY_WRITE);
+    LONG result = dest_key.Create(root, key_path, KEY_WRITE | wow64_access);
     if (result != ERROR_SUCCESS) {
       LOG(ERROR) << "Failed to create destination key at " << key_path
                  << " to write backup, result: " << result;
     } else {
       success = key_data_->WriteTo(&dest_key);
       LOG_IF(ERROR, !success) << "Failed to write key data.";
     }
   } else {
     success = true;
   }
 
   return success;
 }