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

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

Index: chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
index aea2d0324d4fcc3497b872988ef94d6acec15c5f..5768ab24e0ca8123113e1233530c901f26fc4231 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
@@ -193,6 +193,9 @@ class SigninScreenHandler
   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,
@@ -379,6 +382,12 @@ class SigninScreenHandler
   // 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_;