Write the install language to the registry for user-level installs.

chrome/installer/setup/install_worker.h

 // 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.
 //
 // This file contains the declarations of the installer functions that build
 // the WorkItemList used to install the application.
 
 #ifndef CHROME_INSTALLER_SETUP_INSTALL_WORKER_H_
 #define CHROME_INSTALLER_SETUP_INSTALL_WORKER_H_
 #pragma once
@@ skipping 114 matching lines @@
 // This method adds work items to create (or update) Chrome uninstall entry in
 // either the Control Panel->Add/Remove Programs list or in the Omaha client
 // state key if running under an MSI installer.
 void AddUninstallShortcutWorkItems(const InstallerState& installer_state,
                                    const FilePath& setup_path,
                                    const Version& new_version,
                                    WorkItemList* install_list,
                                    const Product& product);
 
 // Create Version key for a product (if not already present) and sets the new
-// product version as the last step.
+// product version as the last step.  If |add_language_identifier| is true, the
+// "lang" value is also set according to the currently selected translation.
 void AddVersionKeyWorkItems(HKEY root,
                             BrowserDistribution* dist,
                             const Version& new_version,
+                            bool add_language_identifier,
                             WorkItemList* list);
 
 // Unregisters the "opv" version of ChromeLauncher from IE's low rights
 // elevation policy.
 void AddDeleteOldIELowRightsPolicyWorkItems(
     const InstallerState& installer_state,
     WorkItemList* install_list);
 
 // Adds work items to copy IE low rights policies for an in-use update.
 void AddCopyIELowRightsPolicyWorkItems(const InstallerState& installer_state,
@@ skipping 16 matching lines @@
 // (and may therefore be NULL) when uninstalling.
 void AddQuickEnableWorkItems(const InstallerState& installer_state,
                              const InstallationState& machine_state,
                              const FilePath* setup_path,
                              const Version* new_version,
                              WorkItemList* work_item_list);
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_SETUP_INSTALL_WORKER_H_