We should switch the keyboard layout to the layout the user set according to

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

 // Copyright (c) 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_
 
 #include <set>
 #include <string>
 
@@ skipping 175 matching lines @@
   void SetDelegate(SigninScreenHandlerDelegate* delegate);
 
   void SetNativeWindowDelegate(NativeWindowDelegate* native_window_delegate);
 
   // NetworkStateInformer::NetworkStateInformerObserver implementation:
   virtual void OnNetworkReady() OVERRIDE;
 
   virtual void UpdateState(NetworkStateInformer::State state,
                            ErrorScreenActor::ErrorReason reason) OVERRIDE;
 
+  // Required Local State preferences.
+  static void RegisterPrefs(PrefRegistrySimple* registry);
+
  private:
   enum UIState {
     UI_STATE_UNKNOWN = 0,
     UI_STATE_GAIA_SIGNIN,
     UI_STATE_ACCOUNT_PICKER,
   };
 
   enum FrameState {
     FRAME_STATE_UNKNOWN = 0,
     FRAME_STATE_LOADING,
@@ skipping 166 matching lines @@
 
   // Returns true if guest signin is allowed.
   bool IsGuestSigninAllowed() const;
 
   // Returns true if offline login is allowed.
   bool IsOfflineLoginAllowed() const;
 
   // Attempts login for test.
   void SubmitLoginFormForTest();
 
+  // Update current input method (namely keyboard layout) to LRU by this user.
+  void SetUserInputMethod(const std::string& username);
+
+  // Update current input method to HW default.
+  void SetUserInputMethodHWDefault();
+
   // Current UI state of the signin screen.
   UIState ui_state_;
 
   // Current state of Gaia frame.
   FrameState frame_state_;
 
   // Latest Gaia frame error.
   net::Error frame_error_;
 
   // A delegate that glues this handler with backend LoginDisplay.
@@ skipping 66 matching lines @@
   // NOTIFICATION_AUTH_NEEDED and reset on either NOTIFICATION_AUTH_SUPPLIED or
   // NOTIFICATION_AUTH_CANCELLED.
   bool has_pending_auth_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_