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

chromeos/ime/input_method_manager.h

Index: chromeos/ime/input_method_manager.h
diff --git a/chromeos/ime/input_method_manager.h b/chromeos/ime/input_method_manager.h
index 2eea80e89d4e3a12fa9205536a10039245e9d98d..e3447703006190e6af1a81ab7e4b90eda55dc868 100644
--- a/chromeos/ime/input_method_manager.h
+++ b/chromeos/ime/input_method_manager.h
@@ -180,6 +180,12 @@ class CHROMEOS_EXPORT InputMethodManager {
 
   // If keyboard layout can be uset at login screen
   virtual bool IsLoginKeyboard(const std::string& layout) const = 0;
+
+  // Migrates the xkb id to extension-xkb id.
+  // TODO(shuchen): Remove this function after few milestones are passed.
+  // See: http://crbug.com/345604
+  virtual bool MigrateXkbInputMethods(
+      std::vector<std::string>* input_method_ids) = 0;
 };
 
 }  // namespace input_method