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

chromeos/ime/extension_ime_util.cc

Index: chromeos/ime/extension_ime_util.cc
diff --git a/chromeos/ime/extension_ime_util.cc b/chromeos/ime/extension_ime_util.cc
index 7955e52536caae6569ca3c4a917fb6f66e25ab55..7f4cdb5e3f1697765571535c50efc0999788a805 100644
--- a/chromeos/ime/extension_ime_util.cc
+++ b/chromeos/ime/extension_ime_util.cc
@@ -52,6 +52,19 @@ std::string GetExtensionIDFromInputMethodID(
   return "";
 }
 
+std::string GetInputMethodIDByKeyboardLayout(
+    const std::string& keyboard_layout_id) {
+  bool migrate = UseWrappedExtensionKeyboardLayouts();
+  if (IsKeyboardLayoutExtension(keyboard_layout_id)) {
+    if (migrate)
+      return keyboard_layout_id;
+    return keyboard_layout_id.substr(arraysize(kExtensionXkbIdPrefix) - 1);
+  }
+  if (migrate && StartsWithASCII(keyboard_layout_id, "xkb:", true))
+    return kExtensionXkbIdPrefix + keyboard_layout_id;
+  return keyboard_layout_id;
+}
+
 bool IsExtensionIME(const std::string& input_method_id) {
   return StartsWithASCII(input_method_id,
                          kExtensionIMEPrefix,
@@ -75,5 +88,11 @@ bool IsKeyboardLayoutExtension(const std::string& input_method_id) {
   return StartsWithASCII(input_method_id, kExtensionXkbIdPrefix, true);
 }
 
+bool UseWrappedExtensionKeyboardLayouts() {
+  // Hard coded to true. If the wrapped extension keyboards misbehaves,
+  // we can easily change this to false to switch back to legacy xkb keyboards.
+  return true;
+}
+
 }  // namespace extension_ime_util
 }  // namespace chromeos