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

chromeos/ime/extension_ime_util.h

Index: chromeos/ime/extension_ime_util.h
diff --git a/chromeos/ime/extension_ime_util.h b/chromeos/ime/extension_ime_util.h
index 446e59e05b19feb031b5839e13b0cf1ffd357391..bdcc896c631f321bd0bc72a315d2183e04c39c2d 100644
--- a/chromeos/ime/extension_ime_util.h
+++ b/chromeos/ime/extension_ime_util.h
@@ -48,6 +48,11 @@ bool CHROMEOS_EXPORT IsComponentExtensionIME(
 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