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

chrome/browser/chromeos/input_method/input_method_manager_impl_ll.h

-// Copyright 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_CHROMEOS_INPUT_METHOD_INPUT_METHOD_MANAGER_IMPL_LL_H_
-#define CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_MANAGER_IMPL_LL_H_
-
-// "Latin Layout" checker: checks if given keyboard layout is "Full Latin Input"
-
-#include <string>
-#include <vector>
-
-#include "base/strings/string_util.h"
-
-namespace chromeos {
-namespace input_method {
-
-class TwoLetterLanguageCode {
- public:
-  TwoLetterLanguageCode() : val(0) {}
-  explicit TwoLetterLanguageCode(const char* lang)
-      : val(base::ToLowerASCII(lang[0]) * 256 + base::ToLowerASCII(lang[1])) {}
-
-  bool operator<(const TwoLetterLanguageCode& r) const { return val < r.val; }
-  bool operator!=(const TwoLetterLanguageCode& r) const { return val != r.val; }
-
- private:
-  uint16_t val;
-};
-
-// To keep index small, sizeof(TwoLetterLanguageCode2KBDList) = 4.
-class TwoLetterLanguageCode2KBDList {
- public:
-  TwoLetterLanguageCode2KBDList() : index(0) {}
-  TwoLetterLanguageCode2KBDList(const char* l, const uint16_t i)
-      : lang(l), index(i) {}
-
-  bool operator<(const TwoLetterLanguageCode2KBDList& r) const {
-    return lang < r.lang;
-  }
-  bool operator<(const TwoLetterLanguageCode& r) const { return lang < r; }
-
-  TwoLetterLanguageCode lang;
-
-  // index in kHasLatinKeyboardLanguageList[]
-  uint16_t index;
-};
-
-// For fast lookup "whether this language and layout are among listed in
-// kHasLatinKeyboardLanguageList[] or not".
-class FullLatinKeyboardLayoutChecker {
- public:
-  FullLatinKeyboardLayoutChecker();
-  ~FullLatinKeyboardLayoutChecker();
-
-  bool IsFullLatinKeyboard(const std::string& layout,
-                           const std::string& lang) const;
-
- private:
-  // Sorted vector for fast lookup.
-  std::vector<TwoLetterLanguageCode2KBDList> full_latin_keyboard_languages_;
-};
-
-}  // namespace input_method
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_MANAGER_IMPL_LL_H_