Force encryption migration if the device supports ARC.

chrome/browser/chromeos/login/screens/encryption_migration_screen_view.h

Index: chrome/browser/chromeos/login/screens/encryption_migration_screen_view.h
diff --git a/chrome/browser/chromeos/login/screens/encryption_migration_screen_view.h b/chrome/browser/chromeos/login/screens/encryption_migration_screen_view.h
index 5ff8dc81c90748257cedd950fe0153e7417bbb16..4aaeaf8d34baf325c9a4fdb0ea83a84654bc0139 100644
--- a/chrome/browser/chromeos/login/screens/encryption_migration_screen_view.h
+++ b/chrome/browser/chromeos/login/screens/encryption_migration_screen_view.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_ENCRYPTION_MIGRATION_SCREEN_VIEW_H_
 
 #include "chrome/browser/chromeos/login/oobe_screen.h"
+#include "chromeos/login/auth/login_performer.h"
 
 namespace chromeos {
 
@@ -13,6 +14,10 @@ class UserContext;
 
 class EncryptionMigrationScreenView {
  public:
+  using ContinueLoginCallback =
+      base::OnceCallback<void(const UserContext&,
+                              LoginPerformer::AuthorizationMode)>;
+
   class Delegate {
    public:
     virtual ~Delegate() {}
@@ -34,6 +39,7 @@ class EncryptionMigrationScreenView {
   virtual void Hide() = 0;
   virtual void SetDelegate(Delegate* delegate) = 0;
   virtual void SetUserContext(const UserContext& user_context) = 0;
+  virtual void SetContinueLoginCallback(ContinueLoginCallback callback) = 0;
 };
 
 }  // namespace chromeos