ChromeOS: switch UI language before apps are loaded.

chrome/browser/chromeos/login/session/user_session_manager.h

Index: chrome/browser/chromeos/login/session/user_session_manager.h
diff --git a/chrome/browser/chromeos/login/session/user_session_manager.h b/chrome/browser/chromeos/login/session/user_session_manager.h
index c8eec25bf155e2321ce699f23ce60c935e58a008..b243e5a9b94571c6c3199e321be11a6fa38a6221 100644
--- a/chrome/browser/chromeos/login/session/user_session_manager.h
+++ b/chrome/browser/chromeos/login/session/user_session_manager.h
@@ -191,6 +191,12 @@ class UserSessionManager
       const user_manager::User* user,
       const locale_util::SwitchLanguageCallback& callback) const;
 
+  // Switch to the locale that |profile| wishes to use and invoke |callback|.
+  // If |synchronous| is true, wait for language switched.
+  void RespectLocalePreferenceWrapper(Profile* profile,
+                                      const base::Closure& callback,
+                                      bool synchronous);
+
   // Restarts Chrome if needed. This happens when user session has custom
   // flags/switches enabled. Another case when owner has setup custom flags,
   // they are applied on login screen as well but not to user session.
@@ -351,10 +357,6 @@ class UserSessionManager
                                LoginDisplayHost* login_host,
                                bool locale_pref_checked);
 
-  // Switch to the locale that |profile| wishes to use and invoke |callback|.
-  void RespectLocalePreferenceWrapper(Profile* profile,
-                                      const base::Closure& callback);
-
   static void RunCallbackOnLocaleLoaded(
       const base::Closure& callback,
       InputEventsBlocker* input_events_blocker,