Resume encryption migration immediately if the previous migration is incomplete.

chromeos/login/auth/auth_status_consumer.h

Index: chromeos/login/auth/auth_status_consumer.h
diff --git a/chromeos/login/auth/auth_status_consumer.h b/chromeos/login/auth/auth_status_consumer.h
index 86c1b579b5ea765eecd07d31c0fc5aeff7e5ceaf..0c1158b3c66a62c2a47d007f9494ba3065c4ee9e 100644
--- a/chromeos/login/auth/auth_status_consumer.h
+++ b/chromeos/login/auth/auth_status_consumer.h
@@ -121,7 +121,8 @@ class CHROMEOS_EXPORT AuthStatusConsumer {
   // The same password didn't work both online and offline.
   virtual void OnPasswordChangeDetected();
   // The cryptohome is encrypted in old format and needs migration.
-  virtual void OnOldEncryptionDetected(const UserContext& user_context);
+  virtual void OnOldEncryptionDetected(const UserContext& user_context,
+                                       bool has_incomplete_migration);
 };
 
 }  // namespace chromeos