Manage monotonic offsets correctly in y2020 localizer

Currently only supports a single pi, but expanding to pi[2-5] shouldn't
be difficult.

Change-Id: Ibed8bd5a59e1a5a9971e9b60c81da413c21b4f7e
diff --git a/aos/controls/control_loop_test.h b/aos/controls/control_loop_test.h
index 7ad5683..536df02 100644
--- a/aos/controls/control_loop_test.h
+++ b/aos/controls/control_loop_test.h
@@ -114,6 +114,10 @@
     return &configuration_.message();
   }
 
+  SimulatedEventLoopFactory *event_loop_factory() {
+    return &event_loop_factory_;
+  }
+
  private:
   // Sends out all of the required queue messages.
   void SendJoystickState() {