Add @NonNull annotation to match overload.

Test: none
Bug: 72404262
Change-Id: Ia43bac5083e77f7c5a8d75a20902ba0139be7ed3
diff --git a/compat/src/main/java/android/support/v4/app/NotificationManagerCompat.java b/compat/src/main/java/android/support/v4/app/NotificationManagerCompat.java
index 07fcb6c..7099cb9 100644
--- a/compat/src/main/java/android/support/v4/app/NotificationManagerCompat.java
+++ b/compat/src/main/java/android/support/v4/app/NotificationManagerCompat.java
@@ -190,7 +190,7 @@
      * @param id the ID of the notification
      * @param notification the notification to post to the system
      */
-    public void notify(int id, Notification notification) {
+    public void notify(int id, @NonNull Notification notification) {
         notify(null, id, notification);
     }