Write "logout-started" event on next boot.

chrome/browser/lifetime/application_lifetime.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 "chrome/browser/lifetime/application_lifetime.h"
 
 #include "ash/shell.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 125 matching lines @@
 #endif
   scoped_refptr<BrowserCloseManager> browser_close_manager =
       new BrowserCloseManager;
   browser_close_manager->StartClosingBrowsers();
 }
 
 void AttemptUserExit() {
 #if defined(OS_CHROMEOS)
   StartShutdownTracing();
   chromeos::BootTimesLoader::Get()->AddLogoutTimeMarker("LogoutStarted", false);
-  // Write /tmp/uptime-logout-started as well.
-  const char kLogoutStarted[] = "logout-started";
-  chromeos::BootTimesLoader::Get()->RecordCurrentStats(kLogoutStarted);
 
-  // Login screen should show up in owner's locale.
   PrefService* state = g_browser_process->local_state();
   if (state) {
+    chromeos::BootTimesLoader::Get()->OnLogoutStarted(state);
+
+    // Login screen should show up in owner's locale.
     std::string owner_locale = state->GetString(prefs::kOwnerLocale);
     if (!owner_locale.empty() &&
         state->GetString(prefs::kApplicationLocale) != owner_locale &&
         !state->IsManagedPreference(prefs::kApplicationLocale)) {
       state->SetString(prefs::kApplicationLocale, owner_locale);
       TRACE_EVENT0("shutdown", "CommitPendingWrite");
       state->CommitPendingWrite();
     }
   }
   g_send_stop_request_to_session_manager = true;
@@ skipping 235 matching lines @@
   //    environment is still active.
   if (browser->host_desktop_type() == chrome::HOST_DESKTOP_TYPE_NATIVE)
     return !ash::Shell::HasInstance();
   else if (browser->host_desktop_type() == chrome::HOST_DESKTOP_TYPE_ASH)
     return BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE)->empty();
 #endif
   return true;
 }
 
 }  // namespace chrome