Create flag for event scratch buffer nullability

Test: presubmit
Bug: 339306599
Change-Id: I9b2efadbfb70b30a04abda2d3095e7f4aa4e8b78
diff --git a/services/sensorservice/senserservice_flags.aconfig b/services/sensorservice/senserservice_flags.aconfig
index 8d43f79..f20b213 100644
--- a/services/sensorservice/senserservice_flags.aconfig
+++ b/services/sensorservice/senserservice_flags.aconfig
@@ -13,4 +13,11 @@
   namespace: "sensors"
   description: "This flag controls if the callback onDynamicSensorsDisconnected is implemented or not."
   bug: "316958439"
-}
\ No newline at end of file
+}
+
+flag {
+  name: "sensor_event_connection_send_event_require_nonnull_scratch"
+  namespace: "sensors"
+  description: "This flag controls we allow to pass in nullptr as scratch in SensorEventConnection::sendEvents()"
+  bug: "339306599"
+}