Add more instrumentation for tracking jank in ProxyService creation.

net/proxy/proxy_service.cc

 // Copyright (c) 2012 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/proxy/proxy_service.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 886 matching lines @@
 ProxyService::ProxyService(ProxyConfigService* config_service,
                            ProxyResolver* resolver,
                            NetLog* net_log)
     : resolver_(resolver),
       next_config_id_(1),
       current_state_(STATE_NONE),
       net_log_(net_log),
       stall_proxy_auto_config_delay_(TimeDelta::FromMilliseconds(
           kDelayAfterNetworkChangesMs)),
       quick_check_enabled_(true) {
+  // TODO(eroman): Remove once crbug.com/454983 is solved.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION("454983 ProxyService::ProxyService"));
   NetworkChangeNotifier::AddIPAddressObserver(this);
   NetworkChangeNotifier::AddDNSObserver(this);
   ResetConfigService(config_service);
 }
 
 // static
 ProxyService* ProxyService::CreateUsingSystemProxyResolver(
     ProxyConfigService* proxy_config_service,
     size_t num_pac_threads,
     NetLog* net_log) {
@@ skipping 497 matching lines @@
   config_ = ProxyConfig();
   if (reset_fetched_config)
     fetched_config_ = ProxyConfig();
   current_state_ = STATE_NONE;
 
   return previous_state;
 }
 
 void ProxyService::ResetConfigService(
     ProxyConfigService* new_proxy_config_service) {
+  // TODO(eroman): Remove once crbug.com/454983 is solved.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "454983 ProxyService::ResetConfigService"));
+
   DCHECK(CalledOnValidThread());
   State previous_state = ResetProxyConfig(true);
 
   // Release the old configuration service.
   if (config_service_.get())
     config_service_->RemoveObserver(this);
 
   // Set the new configuration service.
   config_service_.reset(new_proxy_config_service);
   config_service_->AddObserver(this);
@@ skipping 167 matching lines @@
   State previous_state = ResetProxyConfig(false);
   if (previous_state != STATE_NONE)
     ApplyProxyConfigIfAvailable();
 }
 
 void ProxyService::OnDNSChanged() {
   OnIPAddressChanged();
 }
 
 }  // namespace net