instument cluster api review

- String to CharSequence for event name
- @IntDef clean ups
- void for set* APIs
  App will lose app focus and will know it anyway.

bug: 31930987

Change-Id: Ic84c0a0bbe2980f51c3c260f5aa1181bf1b9bbe3
diff --git a/car-lib/src/android/car/cluster/renderer/NavigationRenderer.java b/car-lib/src/android/car/cluster/renderer/NavigationRenderer.java
index 05be734..447348f 100644
--- a/car-lib/src/android/car/cluster/renderer/NavigationRenderer.java
+++ b/car-lib/src/android/car/cluster/renderer/NavigationRenderer.java
@@ -36,8 +36,8 @@
 
     abstract public void onStartNavigation();
     abstract public void onStopNavigation();
-    abstract public void onNextTurnChanged(int event, String road, int turnAngle, int turnNumber,
-            Bitmap image, int turnSide);
+    abstract public void onNextTurnChanged(int event, CharSequence eventName, int turnAngle,
+            int turnNumber, Bitmap image, int turnSide);
     abstract public void onNextTurnDistanceChanged(int distanceMeters, int timeSeconds,
             int displayDistanceMillis, int displayDistanceUnit);
 }