Store the "browser autorestarted, last session must be restored" information in a preference.

chrome/browser/ui/browser_list.cc

Index: chrome/browser/ui/browser_list.cc
diff --git a/chrome/browser/ui/browser_list.cc b/chrome/browser/ui/browser_list.cc
index 3ce3e514977fe7c12975d2d54f620dfebc2dfbf1..8c7fd14dad6b87e0c2cdbb5fcf3f33e29e4b52f6 100644
--- a/chrome/browser/ui/browser_list.cc
+++ b/chrome/browser/ui/browser_list.cc
@@ -302,7 +302,9 @@ void BrowserList::MarkAsCleanShutdown() {
   }
 }
 
-void BrowserList::AttemptExitInternal() {
+void BrowserList::AttemptExitInternal(bool restart) {
+  PrefService* pref_service = g_browser_process->local_state();
+  pref_service->SetBoolean(prefs::kWasRestarted, restart);
   content::NotificationService::current()->Notify(
       content::NOTIFICATION_APP_EXITING,
       content::NotificationService::AllSources(),
@@ -479,7 +481,7 @@ void BrowserList::CloseAllBrowsersWithProfile(Profile* profile) {
 }
 
 // static
-void BrowserList::AttemptUserExit() {
+void BrowserList::AttemptUserExit(bool restart) {
 #if defined(OS_CHROMEOS)
   chromeos::BootTimesLoader::Get()->AddLogoutTimeMarker("LogoutStarted", false);
   // Write /tmp/uptime-logout-started as well.
@@ -506,7 +508,7 @@ void BrowserList::AttemptUserExit() {
   PrefService* pref_service = g_browser_process->local_state();
   pref_service->SetBoolean(prefs::kRestartLastSessionOnShutdown, false);
 #endif
-  AttemptExitInternal();
+  AttemptExitInternal(restart);
 }
 
 // static
@@ -522,24 +524,24 @@ void BrowserList::AttemptRestart() {
   // For CrOS instead of browser restart (which is not supported) perform a full
   // sign out. Session will be only restored if user has that setting set.
   // Same session restore behavior happens in case of full restart after update.
-  AttemptUserExit();
+  AttemptUserExit(true);
 #else
   // Set the flag to restore state after the restart.
   PrefService* pref_service = g_browser_process->local_state();
   pref_service->SetBoolean(prefs::kRestartLastSessionOnShutdown, true);
-  AttemptExit();
+  AttemptExit(true);
 #endif
 }
 
 // static
-void BrowserList::AttemptExit() {
+void BrowserList::AttemptExit(bool restart) {
   // If we know that all browsers can be closed without blocking,
   // don't notify users of crashes beyond this point.
   // Note that MarkAsCleanShutdown does not set UMA's exit cleanly bit
   // so crashes during shutdown are still reported in UMA.
   if (AreAllBrowsersCloseable())
     MarkAsCleanShutdown();
-  AttemptExitInternal();
+  AttemptExitInternal(restart);
 }
 
 #if defined(OS_CHROMEOS)