Adding instrumentation to locate the source of jankiness

components/signin/core/browser/signin_account_id_helper.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/signin_account_id_helper.h"
 
 #include "base/prefs/pref_service.h"
+#include "base/profiler/scoped_profile.h"
 #include "components/signin/core/browser/profile_oauth2_token_service.h"
 #include "components/signin/core/browser/signin_client.h"
 #include "components/signin/core/common/signin_pref_names.h"
 #include "google_apis/gaia/gaia_oauth_client.h"
 
 // TODO(guohui): this class should be moved to a more generic place for reuse.
 class SigninAccountIdHelper::GaiaIdFetcher
     : public OAuth2TokenService::Consumer,
       public gaia::GaiaOAuthClient::Delegate {
  public:
@@ skipping 111 matching lines @@
   token_service_->RemoveObserver(this);
 }
 
 void SigninAccountIdHelper::GoogleSignedOut(const std::string& account_id,
                                             const std::string& username) {
   client_->GetPrefs()->ClearPref(prefs::kGoogleServicesUserAccountId);
 }
 
 void SigninAccountIdHelper::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 SigninAccountIdHelper::OnRefreshTokenAvailable"));
+
   if (account_id == signin_manager_->GetAuthenticatedAccountId()) {
     std::string current_gaia_id =
         client_->GetPrefs()->GetString(prefs::kGoogleServicesUserAccountId);
     if (current_gaia_id.empty() && !disable_for_test_) {
       id_fetcher_.reset(
           new GaiaIdFetcher(client_, token_service_, signin_manager_, this));
     }
   }
 }
 
 void SigninAccountIdHelper::OnPrimaryAccountIdFetched(
     const std::string& gaia_id) {
   if (!gaia_id.empty()) {
     client_->GetPrefs()->SetString(prefs::kGoogleServicesUserAccountId,
                                    gaia_id);
   }
 }
 
 // static
 bool SigninAccountIdHelper::disable_for_test_ = false;
 
 // static
 void SigninAccountIdHelper::SetDisableForTest(bool disable_for_test) {
   disable_for_test_ = disable_for_test;
 }