arc: Start ARC for Public Session users.

components/arc/arc_util.h

 // Copyright 2017 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.
 
 #ifndef COMPONENTS_ARC_ARC_UTIL_H_
 #define COMPONENTS_ARC_ARC_UTIL_H_
 
 // This file contains utility to see ARC functionality status controlled by
 // outside of ARC, e.g. CommandLine flag, attribute of global data/state,
 // users' preferences, and FeatureList.
@@ skipping 48 matching lines @@
 // base::CommandLine::ForCurrentProcess().
 // |command_line| must not be nullptr.
 void SetArcAvailableCommandLineForTesting(base::CommandLine* command_line);
 
 // Returns true if ARC should run under Kiosk mode for the current profile.
 // As it can return true only when user is already initialized, it implies
 // that ARC availability was checked before and IsArcKioskAvailable()
 // 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
 // as a secondary user or signs in to create a supervised user, ARC should be
 // disabled for such cases.
 bool IsArcAllowedForUser(const user_manager::User* user);
 
 // Checks if opt-in verification was disabled by switch in command line.
 // In most cases, it is disabled for testing purpose.
 bool IsArcOptInVerificationDisabled();
 
 // Returns true if the |window|'s aura::client::kAppType is ARC_APP. When
 // |window| is nullptr, returns false.
 bool IsArcAppWindow(aura::Window* window);
 
 // Adjusts the amount of CPU the ARC instance is allowed to use. When
 // |do_restrict| is true, the limit is adjusted so ARC can only use tightly
 // restricted CPU resources.
 void SetArcCpuRestriction(bool do_restrict);
 
 }  // namespace arc
 
 #endif  // COMPONENTS_ARC_ARC_UTIL_H_