arc: Provide API to control Play Store state from autotests

chrome/browser/chromeos/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 CHROME_BROWSER_CHROMEOS_ARC_ARC_UTIL_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_ARC_UTIL_H_
 
 // Most utility should be put in components/arc/arc_util.{h,cc}, rather than
 // here. However, some utility implementation requires other modules defined in
 // chrome/, so this file contains such utilities.
@@ skipping 53 matching lines @@
 bool IsArcPlayStoreEnabledPreferenceManagedForProfile(const Profile* profile);
 
 // Enables or disables Google Play Store on ARC. Currently, it is tied to
 // ARC enabled state, too, so this also should trigger to enable or disable
 // whole ARC system.
 // If the preference is managed, then no-op.
 // It is requirement for a caller to ensure ARC is allowed for the user of
 // the given |profile|.
 // TODO(hidehiko): De-couple the concept to enable ARC system and opt-in
 // to use Google Play Store. Note that there is a plan to use ARC without
-// Google Play Store, then ARC can run without opt-in.
-void SetArcPlayStoreEnabledForProfile(Profile* profile, bool enabled);
+// Google Play Store, then ARC can run without opt-in. Returns false in case
+// enabled state of the Play Store cannot be changed.
+bool SetArcPlayStoreEnabledForProfile(Profile* profile, bool enabled);
 
 // Returns whether all ARC related OptIn preferences (i.e.
 // ArcBackupRestoreEnabled and ArcLocationServiceEnabled) are managed.
 bool AreArcAllOptInPreferencesManagedForProfile(const Profile* profile);
 
 // Returns whether ARC can run on the filesystem mounted at |path|.
 // This function should run only on threads where IO operations are allowed.
 bool IsArcCompatibleFilesystem(const base::FilePath& path);
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_UTIL_H_