Record UMA only when network quality is eligible for caching

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 1451 matching lines @@
 bool NetworkQualityEstimator::ReadCachedNetworkQualityEstimate() {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   if (!persistent_cache_reading_enabled_)
     return false;
 
   nqe::internal::CachedNetworkQuality cached_network_quality;
 
   const bool cached_estimate_available = network_quality_store_->GetById(
       current_network_id_, &cached_network_quality);
-  UMA_HISTOGRAM_BOOLEAN("NQE.CachedNetworkQualityAvailable",
-                        cached_estimate_available);
+  if (network_quality_store_->EligibleForCaching(current_network_id_)) {
+    UMA_HISTOGRAM_BOOLEAN("NQE.CachedNetworkQualityAvailable",
+                          cached_estimate_available);
+  }
 
   if (!cached_estimate_available)
     return false;
 
   const base::TimeTicks now = tick_clock_->NowTicks();
 
   if (cached_network_quality.network_quality().downstream_throughput_kbps() !=
       nqe::internal::kInvalidThroughput) {
     ThroughputObservation througphput_observation(
         cached_network_quality.network_quality().downstream_throughput_kbps(),
@@ skipping 328 matching lines @@
       return "UnweightedAverage";
     case STATISTIC_LAST:
       NOTREACHED();
       return "";
   }
   NOTREACHED();
   return "";
 }
 
 }  // namespace net