Login screen IME policy does not apply in user session

chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc

 // 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.
 
 #include "chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.h"
 
 #include "ash/system/devicetype_utils.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/guid.h"
@@ skipping 859 matching lines @@
 
   scoped_refptr<input_method::InputMethodManager::State> gaia_ime_state =
       imm->GetActiveIMEState()->Clone();
   imm->SetState(gaia_ime_state);
 
   // Set Least Recently Used input method for the user.
   if (!populated_email_.empty()) {
     SigninScreenHandler::SetUserInputMethod(populated_email_,
                                             gaia_ime_state.get());
   } else {
-    std::vector<std::string> input_methods =
-        imm->GetInputMethodUtil()->GetHardwareLoginInputMethodIds();
+    std::vector<std::string> input_methods;
+    if (gaia_ime_state->GetAllowedInputMethods().empty())
+      input_methods =
+          imm->GetInputMethodUtil()->GetHardwareLoginInputMethodIds();

[xiyuan, 2017/04/12 17:42:07]

nit: wrap with {} and else since this takes more than one line

[pmarko, 2017/04/12 19:05:36]

Done.

+    else
+      input_methods = gaia_ime_state->GetAllowedInputMethods();
     const std::string owner_im = SigninScreenHandler::GetUserLastInputMethod(
         user_manager::UserManager::Get()->GetOwnerAccountId().GetUserEmail());
     const std::string system_im = g_browser_process->local_state()->GetString(
         language_prefs::kPreferredKeyboardLayout);
 
     PushFrontIMIfNotExists(owner_im, &input_methods);
     PushFrontIMIfNotExists(system_im, &input_methods);
 
     gaia_ime_state->EnableLoginLayouts(
         g_browser_process->GetApplicationLocale(), input_methods);
@@ skipping 77 matching lines @@
 SigninScreenHandlerDelegate* GaiaScreenHandler::Delegate() {
   return signin_screen_handler_->delegate_;
 }
 
 bool GaiaScreenHandler::IsRestrictiveProxy() const {
   return !disable_restrictive_proxy_check_for_test_ &&
          !IsOnline(captive_portal_status_);
 }
 
 }  // namespace chromeos