Policy to control ARC Backup&Restore.

chrome/browser/chromeos/arc/arc_support_host.cc

Index: chrome/browser/chromeos/arc/arc_support_host.cc
diff --git a/chrome/browser/chromeos/arc/arc_support_host.cc b/chrome/browser/chromeos/arc/arc_support_host.cc
index f34771731e0e443b62edd325f2df5f5c621cdc3d..10f62668e9588dba83333c87f898a96b5675adf1 100644
--- a/chrome/browser/chromeos/arc/arc_support_host.cc
+++ b/chrome/browser/chromeos/arc/arc_support_host.cc
@@ -250,6 +250,8 @@ void ArcSupportHost::EnableMetrics(bool is_enabled) {
 
 void ArcSupportHost::EnableBackupRestore(bool is_enabled) {
   PrefService* pref_service = arc::ArcAuthService::Get()->profile()->GetPrefs();
+  if (pref_service->IsManagedPreference(prefs::kArcBackupRestoreEnabled))

[bartfab (slow), 2016/07/19 13:55:52]

It is safe to set the pref value even when it is managed. The policy value will
trump the user setting anyway.

[Sergey Poromov, 2016/07/19 14:34:28]

Done.

+    return;
   pref_service->SetBoolean(prefs::kArcBackupRestoreEnabled, is_enabled);
 }