Add user UI stop reasons.

Bug: 255767350
Test: Android builds
Change-Id: Ic2e1e48f4516edddada8602ff3f6b96bdc2a3894
diff --git a/stats/enums/app/job/enums.proto b/stats/enums/app/job/enums.proto
index 9a97e95..7104bb3 100644
--- a/stats/enums/app/job/enums.proto
+++ b/stats/enums/app/job/enums.proto
@@ -39,6 +39,7 @@
     INTERNAL_STOP_REASON_DATA_CLEARED = 8;
     INTERNAL_STOP_REASON_RTC_UPDATED = 9;
     INTERNAL_STOP_REASON_SUCCESSFUL_FINISH = 10;
+    INTERNAL_STOP_REASON_USER_UI_STOP = 11;
 }
 
 // Public stop reasons returned through JobParameters.getStopReason()