arc: Start ARC for Public Session users.

components/arc/arc_util.h

Index: components/arc/arc_util.h
diff --git a/components/arc/arc_util.h b/components/arc/arc_util.h
index d653b5ac43d054694f3efc53aa20fa11a76e8750..44873248630ab06afe792f566165901098a40b1b 100644
--- a/components/arc/arc_util.h
+++ b/components/arc/arc_util.h
@@ -66,6 +66,11 @@ void SetArcAvailableCommandLineForTesting(base::CommandLine* command_line);
 // should also return true in that case.
 bool IsArcKioskMode();
 
+// Returns true if current user is a public session.
+// In that case ARC should also be started if available, using the same
+// authentication flow as ARC Kiosk mode.
+bool IsPublicSessionMode();

[hidehiko, 2017/06/08 12:02:27]

(Optional) Looks not ARC specific?
I'm ok to keep it here, but do you have any other better place to put this?

[Sergey Poromov, 2017/06/08 13:56:18]

The check is not ARC specific, but is designed to be used only for ARC checks
(with IsArcKioskMode()), so not sure where is the best place for it.
Even looks like it's currently not differentiated with IsArcKioskMode() check
usage, but more to come.

+
 // Returns true if ARC is allowed for the given user. Note this should not be
 // used as a signal of whether ARC is allowed alone because it only considers
 // user meta data. e.g. a user could be allowed for ARC but if the user signs in