Record UMA only when network quality is eligible for caching

net/nqe/network_quality_store.h

Index: net/nqe/network_quality_store.h
diff --git a/net/nqe/network_quality_store.h b/net/nqe/network_quality_store.h
index 8970c350e11a22400e971faf73e8d9dd2df7ef31..6213da79e862f8f5ddd2cd67a59452acbca65bf7 100644
--- a/net/nqe/network_quality_store.h
+++ b/net/nqe/network_quality_store.h
@@ -67,6 +67,9 @@ class NET_EXPORT_PRIVATE NetworkQualityStore {
   void RemoveNetworkQualitiesCacheObserver(
       NetworkQualitiesCacheObserver* observer);
 
+  // Returns true if network quality for |network_id| can be cached.
+  bool EligibleForCaching(const NetworkID& network_id) const;
+
   // If |disable_offline_check| is set to true, the offline check is disabled
   // when storing the network quality.
   void DisableOfflineCheckForTesting(bool disable_offline_check);