Use request start time for estimating network quality.

net/base/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_BASE_NETWORK_QUALITY_ESTIMATOR_H_
 #define NET_BASE_NETWORK_QUALITY_ESTIMATOR_H_
 
 #include <stdint.h>
 
 #include <deque>
@@ skipping 96 matching lines @@
   // throughput is computed.
   static const int kMinRequestDurationMicroseconds = 1000;
 
   // Construct a NetworkQualityEstimator instance allowing for test
   // configuration.
   // Registers for network type change notifications so estimates can be kept
   // network specific.
   // |allow_local_host_requests_for_tests| should only be true when testing
   // against local HTTP server and allows the requests to local host to be
   // used for network quality estimation.
-  explicit NetworkQualityEstimator(bool allow_local_host_requests_for_tests);
+  // |allow_smaller_responses_for_tests| should only be true when testing
+  // against local HTTP server and allows the responses smaller than
+  // |kMinTransferSizeInBytes| or shorter than |kMinRequestDurationMicroseconds|
+  // to be used for network quality estimation.
+  NetworkQualityEstimator(bool allow_local_host_requests_for_tests,
+                          bool allow_smaller_responses_for_tests);
 
   // Returns the maximum size of the observation buffer.
   // Used for testing.
   size_t GetMaximumObservationBufferSizeForTests() const;
 
   // Returns true if the size of all observation buffers is equal to the
   // |expected_size|. Used for testing.
   bool VerifyBufferSizeForTests(size_t expected_size) const;
 
   // NetworkChangeNotifier::ConnectionTypeObserver implementation.
   void OnConnectionTypeChanged(
       NetworkChangeNotifier::ConnectionType type) override;
 
   // Determines if the requests to local host can be used in estimating the
   // network quality. Set to true only for tests.
   const bool allow_localhost_requests_;
 
+  // Determines if the responses smaller than |kMinTransferSizeInBytes|
+  // or shorter than |kMinTransferSizeInBytes| can be used in estimating the
+  // network quality. Set to true only for tests.
+  const bool allow_small_responses_;
+
   // Time when last connection change was observed.
   base::TimeTicks last_connection_change_;
 
   // Last value passed to |OnConnectionTypeChanged|. This indicates the
   // current connection type.
   NetworkChangeNotifier::ConnectionType current_connection_type_;
 
   // Fastest round-trip-time (RTT) since last connectivity change. RTT measured
   // from URLRequest creation until first byte received.
   base::TimeDelta fastest_rtt_since_last_connection_change_;
@@ skipping 11 matching lines @@
   ObservationBuffer rtt_msec_observations_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkQualityEstimator);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_NETWORK_QUALITY_ESTIMATOR_H_