ChromeOS NetworkScreenHandler should not call CheckAndResolveLocale on UI thread.

chrome/browser/ui/webui/chromeos/login/network_screen_handler.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_NETWORK_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_NETWORK_SCREEN_HANDLER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
+#include "chrome/browser/chromeos/base/locale_util.h"
 #include "chrome/browser/chromeos/login/screens/network_screen_actor.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
 #include "chromeos/ime/component_extension_ime_manager.h"
 #include "chromeos/ime/input_method_manager.h"
 #include "ui/gfx/point.h"
 
 namespace chromeos {
 
 class CoreOobeActor;
 class IdleDetector;
-
-struct NetworkScreenHandlerOnLanguageChangedCallbackData;
+class InputEventsBlocker;
 
 // WebUI implementation of NetworkScreenActor. It is used to interact with
 // the welcome screen (part of the page) of the OOBE.
 class NetworkScreenHandler : public NetworkScreenActor,
                              public BaseScreenHandler,
                              public input_method::InputMethodManager::Observer {
  public:
   explicit NetworkScreenHandler(CoreOobeActor* core_oobe_actor);
   virtual ~NetworkScreenHandler();
 
@@ skipping 13 matching lines @@
   virtual void GetAdditionalParameters(base::DictionaryValue* dict) override;
   virtual void Initialize() override;
 
   // WebUIMessageHandler implementation:
   virtual void RegisterMessages() override;
 
   // InputMethodManager::Observer implementation:
   virtual void InputMethodChanged(input_method::InputMethodManager* manager,
                                   bool show_message) override;
 
+ private:
   // Reloads localized contents.
   void ReloadLocalizedContent();
 
- private:
   // Handles moving off the screen.
   void HandleOnExit();
 
   // Handles change of the language.
   void HandleOnLanguageChanged(const std::string& locale);
 
   // Async callback after ReloadResourceBundle(locale) completed.
-  static void OnLanguageChangedCallback(
-      scoped_ptr<NetworkScreenHandlerOnLanguageChangedCallbackData> context,
-      const std::string& requested_locale,
-      const std::string& loaded_locale,
-      const bool success);
+  void OnLanguageChangedCallback(
+      const InputEventsBlocker* input_events_blocker,
+      const locale_util::LanguageSwitchResult& result);
 
   // Handles change of the input method.
   void HandleOnInputMethodChanged(const std::string& id);
 
   // Handles change of the time zone
   void HandleOnTimezoneChanged(const std::string& timezone);
 
   // Callback when the system timezone settings is changed.
   void OnSystemTimezoneChanged();
 
   // Returns available timezones. Caller gets the ownership.
   static base::ListValue* GetTimezoneList();
 
+  // Starts resolving language list on BlockingPool.
+  void ScheduleResolveLanguageList(
+      scoped_ptr<locale_util::LanguageSwitchResult> language_switch_result);
+
+  // Callback for chromeos::ResolveUILanguageList() (from l10n_util).
+  void OnLanguageListResolved(scoped_ptr<base::ListValue> new_language_list,
+                              std::string new_language_list_locale,
+                              std::string new_selected_language);
+
   NetworkScreenActor::Delegate* screen_;
   CoreOobeActor* core_oobe_actor_;
 
   bool is_continue_enabled_;
 
   // Keeps whether screen should be shown right after initialization.
   bool show_on_init_;
 
   // Position of the network control.
   gfx::Point network_control_pos_;
 
   scoped_ptr<CrosSettings::ObserverSubscription> timezone_subscription_;
 
   // The exact language code selected by user in the menu.
   std::string selected_language_code_;
 
+  // Creation of language list happens on Blocking Pool, so we cache resolved
+  // data.
+  std::string language_list_locale_;
+  scoped_ptr<base::ListValue> language_list_;
+
   base::WeakPtrFactory<NetworkScreenHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_NETWORK_SCREEN_HANDLER_H_