Fix crash on ChromeOS: ActiveUserChanged might happen before profile is created.

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

 // Copyright 2014 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/browser/chromeos/login/session/user_session_manager.h"
 
 #include <string>
 
 #include "base/base_paths.h"
 #include "base/bind.h"
@@ skipping 633 matching lines @@
     case Profile::CREATE_STATUS_CANCELED:
     case Profile::MAX_CREATE_STATUS:
       NOTREACHED();
       break;
   }
 }
 
 void UserSessionManager::InitProfilePreferences(
     Profile* profile,
     const UserContext& user_context) {
+  user_manager::User* user = ProfileHelper::Get()->GetUserByProfile(profile);
+  if (user->is_active()) {
+    input_method::InputMethodManager* manager =
+        input_method::InputMethodManager::Get();
+    manager->SetState(GetDefaultIMEState(profile));
+  }
   if (user_manager::UserManager::Get()->IsCurrentUserNew()) {
     SetFirstLoginPrefs(profile,
                        user_context.GetPublicSessionLocale(),
                        user_context.GetPublicSessionInputMethod());
   }
 
   if (user_manager::UserManager::Get()->IsLoggedInAsSupervisedUser()) {
     user_manager::User* active_user =
         user_manager::UserManager::Get()->GetActiveUser();
     std::string supervised_user_sync_id =
@@ skipping 322 matching lines @@
 void UserSessionManager::NotifyPendingUserSessionsRestoreFinished() {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   user_sessions_restored_ = true;
   FOR_EACH_OBSERVER(chromeos::UserSessionStateObserver,
                     session_state_observer_list_,
                     PendingUserSessionsRestoreFinished());
 }
 
 void UserSessionManager::ActiveUserChanged(
     const user_manager::User* active_user) {
+  Profile* profile = ProfileHelper::Get()->GetProfileByUser(active_user);
+  // If profile has not yet been initialized, delay initialization of IME.
+  if (!profile)
+    return;
+
   input_method::InputMethodManager* manager =
       input_method::InputMethodManager::Get();
   manager->SetState(
       GetDefaultIMEState(ProfileHelper::Get()->GetProfileByUser(active_user)));
 }
 
 scoped_refptr<input_method::InputMethodManager::State>
 UserSessionManager::GetDefaultIMEState(Profile* profile) {
   scoped_refptr<input_method::InputMethodManager::State> state =
       default_ime_states_[profile];
   if (!state) {
     // Profile can be NULL in tests.
     state = input_method::InputMethodManager::Get()->CreateNewState(profile);
     default_ime_states_[profile] = state;
   }
   return state;
 }
 
 }  // namespace chromeos