Read NQE prefs to network quality store under all cases

net/nqe/network_quality_estimator.h

Index: net/nqe/network_quality_estimator.h
diff --git a/net/nqe/network_quality_estimator.h b/net/nqe/network_quality_estimator.h
index 2bc567141ea41e599b8d559cbb01b0829d53d7eb..111248bb048d8a68551945dbf5830865d827d53e 100644
--- a/net/nqe/network_quality_estimator.h
+++ b/net/nqe/network_quality_estimator.h
@@ -398,6 +398,8 @@ class NET_EXPORT NetworkQualityEstimator
                            UnknownEffectiveConnectionType);
   FRIEND_TEST_ALL_PREFIXES(NetworkQualityEstimatorTest,
                            TypicalNetworkQualities);
+  FRIEND_TEST_ALL_PREFIXES(NetworkQualityEstimatorTest,
+                           OnPrefsReadWithReadingDisabled);
 
   // Value of round trip time observations is in base::TimeDelta.
   typedef nqe::internal::Observation<base::TimeDelta> RttObservation;
@@ -761,6 +763,9 @@ class NET_EXPORT NetworkQualityEstimator
   const bool forced_effective_connection_type_set_;
   const EffectiveConnectionType forced_effective_connection_type_;
 
+  // Set to true if reading of the network quality prefs is enabled.
+  const bool persistent_cache_reading_enabled_;
+
   base::ThreadChecker thread_checker_;
 
   // Manages the writing of events to the net log.