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

chromeos/ime/extension_ime_util.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 CHROMEOS_IME_EXTENSION_IME_UTIL_H_
 #define CHROMEOS_IME_EXTENSION_IME_UTIL_H_
 
 #include <string>
 
 #include "chromeos/chromeos_export.h"
@@ skipping 30 matching lines @@
 // If you want to check |input_method_id| is whitelisted component extension
 // IME, please use ComponentExtensionIMEManager::IsWhitelisted instead.
 bool CHROMEOS_EXPORT IsComponentExtensionIME(
     const std::string& input_method_id);
 
 // Returns true if the |input_method| is a member of |extension_id| of extension
 // IME, otherwise returns false.
 bool CHROMEOS_EXPORT IsMemberOfExtension(const std::string& input_method_id,
                                          const std::string& extension_id);
 
+// Returns true if the |input_method_id| is the extension based xkb keyboard,
+// otherwise returns false.
+bool CHROMEOS_EXPORT IsKeyboardLayoutExtension(
+    const std::string& input_method_id);
+
 }  // namespace extension_ime_util
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_IME_EXTENSION_IME_UTIL_H_