Add Network Quality Estimator (NQE) pref manager

net/nqe/network_quality_estimator.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_NQE_NETWORK_QUALITY_ESTIMATOR_H_
 #define NET_NQE_NETWORK_QUALITY_ESTIMATOR_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 200 matching lines @@
   // |use_smaller_responses_for_tests| should only be true when testing.
   // Allows the responses smaller than |kMinTransferSizeInBits| to be used for
   // network quality estimation.
   void SetUseSmallResponsesForTesting(bool use_small_responses);
 
   // Reports |effective_connection_type| to all
   // EffectiveConnectionTypeObservers.
   void ReportEffectiveConnectionTypeForTesting(
       EffectiveConnectionType effective_connection_type);
 
+  // Adds and removes |observer| from the list of cache observers.
+  void AddNetworkQualitiesCacheObserver(
+      nqe::internal::NetworkQualityStore::NetworkQualitiesCacheObserver*
+          observer);
+  void RemoveNetworkQualitiesCacheObserver(
+      nqe::internal::NetworkQualityStore::NetworkQualitiesCacheObserver*
+          observer);
+
  protected:
   // NetworkChangeNotifier::ConnectionTypeObserver implementation:
   void OnConnectionTypeChanged(
       NetworkChangeNotifier::ConnectionType type) override;
 
   // ExternalEstimateProvider::UpdatedEstimateObserver implementation.
   void OnUpdatedEstimateAvailable(const base::TimeDelta& rtt,
                                   int32_t downstream_throughput_kbps,
                                   int32_t upstream_throughput_kbps) override;
 
@@ skipping 47 matching lines @@
   // prediction should be recorded. Virtualized for testing.
   virtual const std::vector<base::TimeDelta>& GetAccuracyRecordingIntervals()
       const;
 
   // Overrides the tick clock used by |this| for testing.
   void SetTickClockForTesting(std::unique_ptr<base::TickClock> tick_clock);
 
   // Returns a random double in the range [0.0, 1.0). Virtualized for testing.
   virtual double RandDouble() const;
 
-  // Returns a pointer to |network_quality_store_|. Used only for testing.
-  nqe::internal::NetworkQualityStore* NetworkQualityStoreForTesting() const;
-
  private:
   FRIEND_TEST_ALL_PREFIXES(NetworkQualityEstimatorTest,
                            AdaptiveRecomputationEffectiveConnectionType);
   FRIEND_TEST_ALL_PREFIXES(NetworkQualityEstimatorTest, StoreObservations);
   FRIEND_TEST_ALL_PREFIXES(NetworkQualityEstimatorTest, TestAddObservation);
   FRIEND_TEST_ALL_PREFIXES(NetworkQualityEstimatorTest, ObtainOperatingParams);
   FRIEND_TEST_ALL_PREFIXES(NetworkQualityEstimatorTest,
                            ObtainAlgorithmToUseFromParams);
   FRIEND_TEST_ALL_PREFIXES(NetworkQualityEstimatorTest, HalfLifeParam);
   FRIEND_TEST_ALL_PREFIXES(NetworkQualityEstimatorTest, ComputedPercentiles);
@@ skipping 327 matching lines @@
   base::ThreadChecker thread_checker_;
 
   base::WeakPtrFactory<NetworkQualityEstimator> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkQualityEstimator);
 };
 
 }  // namespace net
 
 #endif  // NET_NQE_NETWORK_QUALITY_ESTIMATOR_H_