NQE: Change GetEffectiveConnectionType to return last ECT

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 130 matching lines @@
   // Allows the responses smaller than |kMinTransferSizeInBits| to be used for
   // network quality estimation.
   NetworkQualityEstimator(
       std::unique_ptr<ExternalEstimateProvider> external_estimates_provider,
       const std::map<std::string, std::string>& variation_params,
       bool use_local_host_requests_for_tests,
       bool use_smaller_responses_for_tests);
 
   ~NetworkQualityEstimator() override;
 
-  // Returns the effective type of the current connection. Virtualized for
-  // testing.
+  // Returns the last computed effective type of the current connection. The
+  // effective connection type is computed by network quality estimator at
+  // regular intervals and at certain events (e.g., connection change).
+  // Virtualized for testing.
   virtual EffectiveConnectionType GetEffectiveConnectionType() const;
 
   // Returns the effective type of the current connection based on only the
   // samples observed after |start_time|. This should only be used for
   // recording the metrics. Virtualized for testing.
   virtual EffectiveConnectionType GetRecentEffectiveConnectionType(
       const base::TimeTicks& start_time) const;
 
   // Adds |observer| to the list of effective connection type observers. Must be
   // called on the IO thread.
@@ skipping 116 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;
 
+  // Forces recomputtion of effective connection type, and notifies observers if

[RyanSturm, 2016/08/22 18:01:52]

s/recomputtion/recomputation

[tbansal1, 2016/08/22 18:17:41]

Done.

+  // there is a change in its value.
+  void RecomputeEffectiveConnectionType();
+
  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 317 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_