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

chrome/common/pref_names.cc

 // Copyright (c) 2011 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/common/pref_names.h"
 
 #include "base/basictypes.h"
 
 namespace prefs {
 
@@ skipping 1178 matching lines @@
 const char kShutdownType[] = "shutdown.type";
 // Number of processes that were open when the user shut down.
 const char kShutdownNumProcesses[] = "shutdown.num_processes";
 // Number of processes that were shut down using the slow path.
 const char kShutdownNumProcessesSlow[] = "shutdown.num_processes_slow";
 
 // Whether to restart the current Chrome session automatically as the last thing
 // 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";
 const char kNumFoldersOnBookmarkBar[] =
     "user_experience_metrics.num_folders_on_bookmark_bar";
 const char kNumBookmarksInOtherBookmarkFolder[] =
     "user_experience_metrics.num_bookmarks_in_other_bookmark_folder";
 const char kNumFoldersInOtherBookmarkFolder[] =
     "user_experience_metrics.num_folders_in_other_bookmark_folder";
 
@@ skipping 461 matching lines @@
 
 // String that represents the recovery component last downloaded version. This
 // takes the usual 'a.b.c.d' notation.
 const char kRecoveryComponentVersion[] = "recovery_component.version";
 
 // String that stores the component updater last known state. This is used for
 // troubleshooting.
 const char kComponentUpdaterState[] = "component_updater.state";
 
 }  // namespace prefs