Disable non Latin keyboard layout on Lock screen and Sign-in screen.

chrome/browser/chromeos/input_method/input_method_util.cc

 // 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.
 
 #include "chrome/browser/chromeos/input_method/input_method_util.h"
 
 #include <algorithm>
 #include <functional>
 #include <map>
 #include <utility>
@@ skipping 619 matching lines @@
 
 InputMethodDescriptor InputMethodUtil::GetFallbackInputMethodDescriptor() {
   std::vector<std::string> layouts;
   layouts.push_back("us");
   std::vector<std::string> languages;
   languages.push_back("en-US");
   return InputMethodDescriptor("xkb:us::eng",
                                "",
                                layouts,
                                languages,
+                               true,  // login keyboard.
                                GURL());  // options page, not available.
 }
 
 void InputMethodUtil::ReloadInternalMaps() {
   if (supported_input_methods_->size() <= 1) {
     DVLOG(1) << "GetSupportedInputMethods returned a fallback ID";
     // TODO(yusukes): Handle this error in nicer way.
   }
 
   // Clear the existing maps.
@@ skipping 19 matching lines @@
     if (IsKeyboardLayout(input_method.id())) {
       xkb_id_to_descriptor_.insert(
           std::make_pair(input_method.GetPreferredKeyboardLayout(),
                          input_method));
     }
   }
 }
 
 }  // namespace input_method
 }  // namespace chromeos