[Autofill] New APIs for metrics targeting W

Expose new metrics data points to autofill providers starting in W

Bug: 342676602
Test: n/a, API definition only
API-Coverage-Bug: 378916458
Flag: android.service.autofill.autofill_w_metrics
Change-Id: I999af43d8b983a4bbe806b1c8753b89c479faf27
diff --git a/services/autofill/features.aconfig b/services/autofill/features.aconfig
index bd46deb..b3fe5f2 100644
--- a/services/autofill/features.aconfig
+++ b/services/autofill/features.aconfig
@@ -2,6 +2,13 @@
 container: "system"
 
 flag {
+  name: "autofill_w_metrics"
+  namespace: "autofill"
+  description: "Guards against new metrics definitions introduced in W"
+  bug: "342676602"
+}
+
+flag {
   name: "autofill_credman_integration"
   namespace: "autofill"
   description: "Guards Autofill Framework against Autofill-Credman integration"