NQE: Record how frequently NetworkID is available

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 410 matching lines @@
   // Larger size may affect performance.
   static const size_t kMaximumNetworkQualityCacheSize = 10;
 
   // Returns the RTT value to be used when the valid RTT is unavailable. Readers
   // should discard RTT if it is set to the value returned by |InvalidRTT()|.
   static const base::TimeDelta InvalidRTT();
 
   // Records UMA when there is a change in connection type.
   void RecordMetricsOnConnectionTypeChanged() const;
 
+  // Records UMA on whether the NetworkID was available or not. Called right
+  // after a network change event.
+  void RecordNetworkIDAvailability() const;
+
   // Records UMA on main frame requests.
   void RecordMetricsOnMainFrameRequest() const;
 
   // Records a downstream throughput observation to the observation buffer if
   // a valid observation is available. |downstream_kbps| is the downstream
   // throughput in kilobits per second.
   void OnNewThroughputObservationAvailable(int32_t downstream_kbps);
 
   // Notifies |this| of a new transport layer RTT.
   void OnUpdatedRTTAvailable(SocketPerformanceWatcherFactory::Protocol protocol,
@@ skipping 204 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_