HttpServerProperties - Don't persist if SetServerNetworkStats is called

net/http/http_server_properties_manager.cc

 // Copyright 2014 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/http/http_server_properties_manager.h"
 
 #include "base/bind.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 320 matching lines @@
     const IPAddressNumber& address) {
   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
   http_server_properties_impl_->SetSupportsQuic(used_quic, address);
   ScheduleUpdatePrefsOnNetworkThread(SET_SUPPORTS_QUIC);
 }
 
 void HttpServerPropertiesManager::SetServerNetworkStats(
     const HostPortPair& host_port_pair,
     ServerNetworkStats stats) {
   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
+  ServerNetworkStats old_stats;
+  const ServerNetworkStats* old_stats_ptr =
+      http_server_properties_impl_->GetServerNetworkStats(host_port_pair);
+  if (http_server_properties_impl_->GetServerNetworkStats(host_port_pair))
+    old_stats = *old_stats_ptr;
   http_server_properties_impl_->SetServerNetworkStats(host_port_pair, stats);
-  ScheduleUpdatePrefsOnNetworkThread(SET_SERVER_NETWORK_STATS);
+  ServerNetworkStats new_stats =
+      *(http_server_properties_impl_->GetServerNetworkStats(host_port_pair));
+  if (old_stats != new_stats)
+    ScheduleUpdatePrefsOnNetworkThread(SET_SERVER_NETWORK_STATS);
 }
 
 const ServerNetworkStats* HttpServerPropertiesManager::GetServerNetworkStats(
     const HostPortPair& host_port_pair) {
   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
   return http_server_properties_impl_->GetServerNetworkStats(host_port_pair);
 }
 
 const ServerNetworkStatsMap&
 HttpServerPropertiesManager::server_network_stats_map() const {
@@ skipping 618 matching lines @@
                                             server_network_stats_dict);
 }
 
 void HttpServerPropertiesManager::OnHttpServerPropertiesChanged() {
   DCHECK(pref_task_runner_->RunsTasksOnCurrentThread());
   if (!setting_prefs_)
     ScheduleUpdateCacheOnPrefThread();
 }
 
 }  // namespace net