Add enum to BinaryPushStateChanged

Test: m -j
Change-Id: I878561aa3d3a0993e0da052189956a7ee532e192
diff --git a/stats/atoms.proto b/stats/atoms.proto
index 90c8788..c99b39d 100644
--- a/stats/atoms.proto
+++ b/stats/atoms.proto
@@ -4466,6 +4466,7 @@
         // which requires reboot and not eligible for any reboot promotion strategy
         // (e.g. soft restart, notification restart).
         NO_REBOOT_PROMOTION_STRATEGY_ELIGIBLE = 30;
+        REBOOT_TRIGGER_FAILURE = 31;
     }
     optional State state = 6;
     // Possible experiment ids for monitoring this push.