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

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index ed163215bfa10ef7726c8ff672092be87147ea8d..d734b1cba26db8f48831824fb8d985b9b467cae4 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1196,6 +1196,9 @@ const char kShutdownNumProcessesSlow[] = "shutdown.num_processes_slow";
 // before shutting everything down.
 const char kRestartLastSessionOnShutdown[] = "restart.last.session.on.shutdown";
 
+// Set before autorestarting Chrome, cleared on clean exit.
+const char kWasRestarted[] = "was.restarted";

[Finnur, 2011/11/30 18:32:04]

Shouldn't this variable be named kWasAutoRestarted, with value
"was.autorestarted"?

[marja, 2011/12/02 09:23:41]

It's not set only when chrome autorestarts, but also when the user selects
"Update chrome" from the menu and chrome restarts. That cannot be called
"autorestart", right?

+
 // Number of bookmarks/folders on the bookmark bar/other bookmark folder.
 const char kNumBookmarksOnBookmarkBar[] =
     "user_experience_metrics.num_bookmarks_on_bookmark_bar";