Force encryption migration if the device supports ARC.

chromeos/chromeos_switches.cc

Index: chromeos/chromeos_switches.cc
diff --git a/chromeos/chromeos_switches.cc b/chromeos/chromeos_switches.cc
index c6e285bdaa6d9cc18121f078edf169d55d7afab4..5c99525299676d969685107eaf83ebf6c863b4d6 100644
--- a/chromeos/chromeos_switches.cc
+++ b/chromeos/chromeos_switches.cc
@@ -248,6 +248,9 @@ const char kEnableConsumerKiosk[] = "enable-consumer-kiosk";
 // Enables Data Saver prompt on cellular networks.
 const char kEnableDataSaverPrompt[] = "enable-datasaver-prompt";
 
+// Enables encryption migration for user's cryptohome to run latest Arc.
+const char kEnableEncryptionMigration[] = "enable-encryption-migration";
+
 // Shows additional checkboxes in Settings to enable Chrome OS accessibility
 // features that haven't launched yet.
 const char kEnableExperimentalAccessibilityFeatures[] =