[IME] migrate the xkb ID to extension based xkb ID.

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 bdcc896c631f321bd0bc72a315d2183e04c39c2d..17ab50377f0bca4a57bd866bc25fb6d37e2e04e1 100644
--- a/chromeos/ime/extension_ime_util.h
+++ b/chromeos/ime/extension_ime_util.h
@@ -32,6 +32,10 @@ std::string CHROMEOS_EXPORT GetComponentInputMethodID(
 std::string CHROMEOS_EXPORT GetExtensionIDFromInputMethodID(
     const std::string& input_method_id);
 
+// Returns InputMethodID from keyboard layout (xkb) id (e.g. xkb:fr:fra).
+std::string CHROMEOS_EXPORT GetInputMethodIDByKeyboardLayout(
+    const std::string& keyboard_layout_id);
+
 // Returns true if |input_method_id| is extension IME ID. This function does not
 // check |input_method_id| is installed extension IME.
 bool CHROMEOS_EXPORT IsExtensionIME(const std::string& input_method_id);
@@ -53,6 +57,9 @@ bool CHROMEOS_EXPORT IsMemberOfExtension(const std::string& input_method_id,
 bool CHROMEOS_EXPORT IsKeyboardLayoutExtension(
     const std::string& input_method_id);
 
+// Returns true if the flag --migrate-xkb is true, returns false otherwise.
+bool CHROMEOS_EXPORT IsMigrateXkbEnabled();
+
 }  // namespace extension_ime_util
 
 }  // namespace chromeos