[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..009ca5becb4ef6188d721d4391ec7fa4aef616ee 100644
--- a/chromeos/ime/extension_ime_util.cc
+++ b/chromeos/ime/extension_ime_util.cc
@@ -52,6 +52,13 @@ std::string GetExtensionIDFromInputMethodID(
   return "";
 }
 
+std::string GetInputMethodIDByKeyboardLayout(
+    const std::string& keyboard_layout_id) {
+  if (IsKeyboardLayoutExtension(keyboard_layout_id))
+    return keyboard_layout_id;
+  return kExtensionXkbIdPrefix + keyboard_layout_id;

[Yuki, 2014/02/27 02:40:33]

I think it would be safer to DCHECK(keyboard_layout_id starts with "xkb:");

[Shu Chen, 2014/02/27 03:12:12]

The passed in keyboard_layout_id could be a new extension-based xkb id.
It would be safer to let this function handle that.

+}
+
 bool IsExtensionIME(const std::string& input_method_id) {
   return StartsWithASCII(input_method_id,
                          kExtensionIMEPrefix,