cros: Show dircryto migration banner

chromeos/dbus/fake_cryptohome_client.h

Index: chromeos/dbus/fake_cryptohome_client.h
diff --git a/chromeos/dbus/fake_cryptohome_client.h b/chromeos/dbus/fake_cryptohome_client.h
index 0cf31deab36cf5e007e420e398c8053ec81a5f3f..bfbf237af1ed9b9731942d3b5700085cde6c1920 100644
--- a/chromeos/dbus/fake_cryptohome_client.h
+++ b/chromeos/dbus/fake_cryptohome_client.h
@@ -207,6 +207,8 @@ class CHROMEOS_EXPORT FakeCryptohomeClient : public CryptohomeClient {
   void SetFirmwareManagementParametersInTpm(
       const cryptohome::SetFirmwareManagementParametersRequest& request,
       const ProtobufMethodCallback& callback) override;
+  void NeedsDircryptoMigration(const cryptohome::Identification& cryptohome_id,
+                               const BoolDBusMethodCallback& callback) override;
 
   // Changes the behavior of WaitForServiceToBeAvailable(). This method runs
   // pending callbacks if is_available is true.