[IME] Loads chromeos-xkb extension and add the extension based xkb keyboards in the chrome://settin…

chrome/browser/chromeos/input_method/input_method_engine.cc

Index: chrome/browser/chromeos/input_method/input_method_engine.cc
diff --git a/chrome/browser/chromeos/input_method/input_method_engine.cc b/chrome/browser/chromeos/input_method/input_method_engine.cc
index b9f58b5a0f5be8ee0038eb81ccfaf84ad3ed7e76..e095241d6c15a1a55e7887dadda28b51dc908e97 100644
--- a/chrome/browser/chromeos/input_method/input_method_engine.cc
+++ b/chrome/browser/chromeos/input_method/input_method_engine.cc
@@ -106,7 +106,8 @@ void InputMethodEngine::Initialize(
       std::string(), // TODO(uekawa): Set short name.
       layouts,
       languages,
-      false,  // is_login_keyboard
+      extension_ime_util::IsKeyboardLayoutExtension(
+          imm_id_), // is_login_keyboard
       options_page,
       input_view);