Exposing NQE on the Browser UI thread

net/nqe/network_quality_estimator.cc

 // 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.
 
 #include "net/nqe/network_quality_estimator.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <utility>
@@ skipping 247 matching lines @@
           NetworkID(NetworkChangeNotifier::ConnectionType::CONNECTION_UNKNOWN,
                     std::string())),
       downstream_throughput_kbps_observations_(weight_multiplier_per_second_),
       rtt_observations_(weight_multiplier_per_second_),
       effective_connection_type_at_last_main_frame_(
           EFFECTIVE_CONNECTION_TYPE_UNKNOWN),
       external_estimate_provider_(std::move(external_estimates_provider)),
       effective_connection_type_(EFFECTIVE_CONNECTION_TYPE_UNKNOWN),
       min_signal_strength_since_connection_change_(INT32_MAX),
       max_signal_strength_since_connection_change_(INT32_MIN),
+      stop_reporting_effective_connection_type_(false),
       weak_ptr_factory_(this) {
   static_assert(kDefaultHalfLifeSeconds > 0,
                 "Default half life duration must be > 0");
   static_assert(kMaximumNetworkQualityCacheSize > 0,
                 "Size of the network quality cache must be > 0");
   // This limit should not be increased unless the logic for removing the
   // oldest cache entry is rewritten to use a doubly-linked-list LRU queue.
   static_assert(kMaximumNetworkQualityCacheSize <= 10,
                 "Size of the network quality cache must <= 10");
   // None of the algorithms can have an empty name.
@@ skipping 452 matching lines @@
       use_localhost_requests_);
 }
 
 void NetworkQualityEstimator::SetUseSmallResponsesForTesting(
     bool use_small_responses) {
   DCHECK(thread_checker_.CalledOnValidThread());
   use_small_responses_ = use_small_responses;
   throughput_analyzer_->SetUseSmallResponsesForTesting(use_small_responses_);
 }
 
+void NetworkQualityEstimator::StopReportingEffectiveConnectionTypeForTesting() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  stop_reporting_effective_connection_type_ = true;
+}
+
+void NetworkQualityEstimator::ReportEffectiveConnectionTypeForTesting(
+    EffectiveConnectionType effective_connection_type) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  FOR_EACH_OBSERVER(
+      EffectiveConnectionTypeObserver, effective_connection_type_observer_list_,
+      OnEffectiveConnectionTypeChanged(effective_connection_type));
+}
+
 bool NetworkQualityEstimator::RequestProvidesRTTObservation(
     const URLRequest& request) const {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   return (use_localhost_requests_ || !IsLocalhost(request.url().host())) &&
          // Verify that response headers are received, so it can be ensured that
          // response is not cached.
          !request.response_info().response_time.is_null() &&
          !request.was_cached() &&
          request.creation_time() >= last_connection_change_;
@@ skipping 714 matching lines @@
   last_effective_connection_type_computation_ = now;
   effective_connection_type_ = GetEffectiveConnectionType();
 
   if (past_type != effective_connection_type_)
     NotifyObserversOfEffectiveConnectionTypeChanged();
 }
 
 void NetworkQualityEstimator::
     NotifyObserversOfEffectiveConnectionTypeChanged() {
   DCHECK(thread_checker_.CalledOnValidThread());
-
+  if (stop_reporting_effective_connection_type_)
+    return;
   // TODO(tbansal): Add hysteresis in the notification.
   FOR_EACH_OBSERVER(
       EffectiveConnectionTypeObserver, effective_connection_type_observer_list_,
       OnEffectiveConnectionTypeChanged(effective_connection_type_));
 }
 
 }  // namespace net