Add more instrumentation for tracking jank in ProxyService creation.

BUG=454983

Review URL: https://codereview.chromium.org/982473002

Cr-Commit-Position: refs/heads/master@{#319188}

net/proxy/proxy_config_service_win.cc

@@ -11,9 +11,10 @@
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/stl_util.h"
-#include "base/strings/string_util.h"
 #include "base/strings/string_tokenizer.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/win/registry.h"
@@ -62,6 +63,11 @@ void ProxyConfigServiceWin::AddObserver(Observer* observer) {
 }
 
 void ProxyConfigServiceWin::StartWatchingRegistryForChanges() {
+  // TODO(eroman): Remove once crbug.com/454983 is solved.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "454983 ProxyConfigServiceWin::StartWatchingRegistryForChanges"));
+
   if (!keys_to_watch_.empty())
     return;  // Already initialized.
 

net/proxy/proxy_service.cc

@@ -904,6 +904,9 @@ ProxyService::ProxyService(ProxyConfigService* config_service,
       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);
@@ -1421,6 +1424,11 @@ ProxyService::State ProxyService::ResetProxyConfig(bool reset_fetched_config) {
 
 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);