Add left/right switches for auto

Change-Id: Idde67276c32050fe7541bf621c4eb818a773a950
diff --git a/aos/input/action_joystick_input.h b/aos/input/action_joystick_input.h
index 87b980e..dca4d39 100644
--- a/aos/input/action_joystick_input.h
+++ b/aos/input/action_joystick_input.h
@@ -40,6 +40,10 @@
   void StartAuto();
   void StopAuto();
 
+  // Returns the current autonomous mode which has been selected by robot
+  // inputs.
+  virtual uint32_t GetAutonomousMode() { return 0; }
+
   // True if the internal state machine thinks auto is running right now.
   bool auto_running_ = false;
   // True if an action was running last cycle.