[NOT FOR REVIEW] Instrument net/ with trace events.

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_macros.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/thread_task_runner_handle.h"
+#include "base/trace_event/trace_event.h"
 #include "base/values.h"
 #include "net/base/ip_address.h"
 #include "net/base/port_util.h"
 
 namespace net {
 
 namespace {
 
 // Time to wait before starting an update the http_server_properties_impl_ cache
 // from preferences. Scheduling another update during this period will reset the
@@ skipping 810 matching lines @@
 }
 
 void HttpServerPropertiesManager::UpdateCacheFromPrefsOnNetworkThread(
     ServerList* spdy_servers,
     SpdySettingsMap* spdy_settings_map,
     AlternativeServiceMap* alternative_service_map,
     IPAddress* last_quic_address,
     ServerNetworkStatsMap* server_network_stats_map,
     QuicServerInfoMap* quic_server_info_map,
     bool detected_corrupted_prefs) {
+  TRACE_EVENT0(
+      "net",
+      "HttpServerPropertiesManager::UpdateCacheFromPrefsOnNetworkThread");
   // Preferences have the master data because admins might have pushed new
   // preferences. Update the cached data with new data from preferences.
   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 
   UMA_HISTOGRAM_COUNTS("Net.CountOfSpdyServers", spdy_servers->size());
   http_server_properties_impl_->InitializeSpdyServers(spdy_servers, true);
 
   // Update the cached data and use the new spdy_settings from preferences.
   UMA_HISTOGRAM_COUNTS("Net.CountOfSpdySettings", spdy_settings_map->size());
   http_server_properties_impl_->InitializeSpdySettingsServers(
@@ skipping 406 matching lines @@
                                                        quic_servers_dict);
 }
 
 void HttpServerPropertiesManager::OnHttpServerPropertiesChanged() {
   DCHECK(pref_task_runner_->RunsTasksOnCurrentThread());
   if (!setting_prefs_)
     ScheduleUpdateCacheOnPrefThread();
 }
 
 }  // namespace net