ChromeOS: switch UI language before apps are loaded.

chrome/browser/chromeos/base/locale_util.h

 // Copyright 2013 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 utility functions for locale change.
 
 #ifndef CHROME_BROWSER_CHROMEOS_BASE_LOCALE_UTIL_H_
 #define CHROME_BROWSER_CHROMEOS_BASE_LOCALE_UTIL_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 
+class Profile;
+
 namespace base {
 
 template <typename T>
 class Callback;
 
 }  // namespace base
 
 namespace chromeos {
 namespace locale_util {
 
@@ skipping 11 matching lines @@
 // completed on BlockingPool.
 // |result| contains:
 //   locale - (copy of) locale argument to SwitchLanguage(). Expected locale.
 //   loaded_locale - actual locale name loaded.
 //   success - if locale load succeeded.
 // (const std::string* locale, const std::string* loaded_locale, bool success)
 typedef base::Callback<void(const LanguageSwitchResult& result)>
     SwitchLanguageCallback;
 
 // This function updates input methods only if requested. In general, you want
-// |enable_locale_keyboard_layouts = true|.
+// |enable_locale_keyboard_layouts = true|. |profile| is needed because IME
+// extensions are per-user.
 // Note: in case of |enable_locale_keyboard_layouts = false|, the input method
 // currently in use may not be supported by the new locale. Using the new locale
 // with an unsupported input method may lead to undefined behavior. Use
 // |enable_locale_keyboard_layouts = false| with caution.
 // Note 2: |login_layouts_only = true| enables only login-capable layouts.
 void SwitchLanguage(const std::string& locale,
                     const bool enable_locale_keyboard_layouts,
                     const bool login_layouts_only,
-                    const SwitchLanguageCallback& callback);
+                    const SwitchLanguageCallback& callback,
+                    Profile* profile);
 
 }  // namespace locale_util
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_BASE_LOCALE_UTIL_H_