Domain Reliability: Mark beacons from previous networks.

components/domain_reliability/beacon.h

Index: components/domain_reliability/beacon.h
diff --git a/components/domain_reliability/beacon.h b/components/domain_reliability/beacon.h
index c50db2b7fcc1884a59f00d0219a48d9e0ad8a717..cb5ed8c5081e8de22611ac73a596272b91658017 100644
--- a/components/domain_reliability/beacon.h
+++ b/components/domain_reliability/beacon.h
@@ -24,7 +24,8 @@ struct DOMAIN_RELIABILITY_EXPORT DomainReliabilityBeacon {
 
   // Converts the Beacon to JSON format for uploading. Calculates the age
   // relative to an upload time of |upload_time|.
-  base::Value* ToValue(base::TimeTicks upload_time) const;
+  base::Value* ToValue(base::TimeTicks upload_time,
+                       base::TimeTicks last_network_change_time) const;
 
   // The URL that the beacon is reporting on, if included.
   std::string url;