Add fallback behavior if the last used profile cannot initialize

chrome/browser/ui/startup/startup_browser_creator.h

Index: chrome/browser/ui/startup/startup_browser_creator.h
diff --git a/chrome/browser/ui/startup/startup_browser_creator.h b/chrome/browser/ui/startup/startup_browser_creator.h
index f2e3c0a5fd757609b5df07e3960161ba5350888d..932140afc922c07daa7a967c46af5803318baa02 100644
--- a/chrome/browser/ui/startup/startup_browser_creator.h
+++ b/chrome/browser/ui/startup/startup_browser_creator.h
@@ -179,4 +179,21 @@ bool HasPendingUncleanExit(Profile* profile);
 base::FilePath GetStartupProfilePath(const base::FilePath& user_data_dir,
                                      const base::CommandLine& command_line);
 
+#if !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
+// Returns the profile that should be loaded on process startup. This is either
+// the profile returned by GetStartupProfilePath, or the guest profile if the
+// above profile is locked. The guest profile denotes that we should open the
+// user manager. Returns null if the above profile cannot be opened. In case of
+// user manager, returns null if either the guest profile or the system profile

[Peter Kasting, 2016/07/19 21:56:07]

Nit: user -> opening the user

[WC Leung, 2016/07/27 18:00:06]

Done.

+// cannot be opened.
+Profile* GetStartupProfile(const base::FilePath& user_data_dir,
+                           const base::CommandLine& command_line);
+
+// Returns the profile that should be loaded on process startup when
+// GetStartupProfile() returns null. As with GetStartupProfile(), returning the
+// guest profile means the caller should open the user manager. This may return
+// null if no profile nor the user manager can be opened.

[Peter Kasting, 2016/07/19 21:56:07]

Nit: no profile nor the user manager -> neither the user manager nor any profile

[WC Leung, 2016/07/27 18:00:06]

Done.

+Profile* GetFallbackStartupProfile();
+#endif  // !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
+
 #endif  // CHROME_BROWSER_UI_STARTUP_STARTUP_BROWSER_CREATOR_H_