Adding instrumentation to locate the source of jankiness

components/signin/core/browser/account_tracker_service.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 "components/signin/core/browser/account_tracker_service.h"
 
 #include "base/debug/trace_event.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
+#include "base/profiler/scoped_profile.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/signin/core/browser/signin_manager.h"
 #include "components/signin/core/common/signin_pref_names.h"
 #include "google_apis/gaia/gaia_auth_util.h"
 #include "google_apis/gaia/gaia_constants.h"
 #include "google_apis/gaia/gaia_oauth_client.h"
 #include "google_apis/gaia/oauth2_token_service.h"
 #include "net/url_request/url_request_context_getter.h"
 
 namespace {
@@ skipping 230 matching lines @@
 
 // static
 AccountTrackerService::AccountIdMigrationState
 AccountTrackerService::GetMigrationState(PrefService* pref_service) {
   return static_cast<AccountTrackerService::AccountIdMigrationState>(
       pref_service->GetInteger(prefs::kAccountIdMigrationState));
 }
 
 void AccountTrackerService::OnRefreshTokenAvailable(
     const std::string& account_id) {
+  // TODO(vadimt): Remove ScopedProfile below once crbug.com/422460 is fixed.
+  tracked_objects::ScopedProfile tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422460 AccountTrackerService::OnRefreshTokenAvailable"));
+
   TRACE_EVENT1("AccountTrackerService",
                "AccountTracker::OnRefreshTokenAvailable",
                "account_id",
                account_id);
   DVLOG(1) << "AVAILABLE " << account_id;
 
   StartTrackingAccount(account_id);
   AccountState& state = accounts_[account_id];
 
   if (state.info.gaia.empty())
@@ skipping 165 matching lines @@
   }
 }
 
 void AccountTrackerService::LoadFromTokenService() {
   std::vector<std::string> accounts = token_service_->GetAccounts();
   for (std::vector<std::string>::const_iterator it = accounts.begin();
        it != accounts.end(); ++it) {
     OnRefreshTokenAvailable(*it);
   }
 }