NQE: Use cached estimates

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 6bd701911ee1efad103ebf7362e6339a027e40e7..50ae4285978871bb18144da40b8b0b237088dce3 100644
--- a/net/nqe/network_quality_estimator.h
+++ b/net/nqe/network_quality_estimator.h
@@ -489,8 +489,12 @@ class NET_EXPORT NetworkQualityEstimator
   // Virtualized for testing.
   virtual nqe::internal::NetworkID GetCurrentNetworkID() const;
 
+  // Notifies RTT observers of |observation|. May also trigger recomputation
+  // of effective connection type.
   void NotifyObserversOfRTT(const RttObservation& observation);
 
+  // Notifies throughput observers of |observation|. May also trigger
+  // recomputation of effective connection type.
   void NotifyObserversOfThroughput(const ThroughputObservation& observation);
 
   // Returns true only if the |request| can be used for RTT estimation.
@@ -579,6 +583,13 @@ class NET_EXPORT NetworkQualityEstimator
   // if there is a change in its value.
   void ComputeEffectiveConnectionType();
 
+  // May update the network quality of the current network if |network_id|
+  // matches the ID of the current network. |cached_network_quality| is the
+  // cached network quality of the network with id |network_id|.
+  void MaybeUpdateNetworkQualityFromCache(
+      const nqe::internal::NetworkID& network_id,
+      const nqe::internal::CachedNetworkQuality& cached_network_quality);
+
   // Determines if the requests to local host can be used in estimating the
   // network quality. Set to true only for tests.
   bool use_localhost_requests_;