Fix refresh token is not available after Chrome restart on crash.

components/signin/core/browser/signin_manager_base.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_manager_base.h"
 
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 198 matching lines @@
                                    info.gaia);
   }
 
   // Go ahead and update the last signed in account info here as well. Once a
   // user is signed in the corresponding preferences should match. Doing it here
   // as opposed to on signin allows us to catch the upgrade scenario.
   client_->GetPrefs()->SetString(prefs::kGoogleServicesLastAccountId,
                                  account_id);
   client_->GetPrefs()->SetString(prefs::kGoogleServicesLastUsername,
                                  info.email);
+
+  client_->GetPrefs()->CommitPendingWrite();

[xiyuan, 2017/03/16 15:59:02]

nit: Let's add a comment of why this is needed,

e.g.
  // Commit authenticated account info immediately so that it does
  // not get lost if chrome crashes before the next commit interval.

[khmel, 2017/03/16 16:19:43]

Thanks, done

 }
 
 bool SigninManagerBase::IsAuthenticated() const {
   return !authenticated_account_id_.empty();
 }
 
 bool SigninManagerBase::AuthInProgress() const {
   // SigninManagerBase never kicks off auth processes itself.
   return false;
 }
@@ skipping 17 matching lines @@
     SigninDiagnosticsObserver* observer) {
   signin_diagnostics_observers_.RemoveObserver(observer);
 }
 
 void SigninManagerBase::NotifyDiagnosticsObservers(
     const TimedSigninStatusField& field,
     const std::string& value) {
   for (auto& observer : signin_diagnostics_observers_)
     observer.NotifySigninValueChanged(field, value);
 }