cryptohome: Add dbus method and signal name for encryption migration.

chromeos/dbus/mock_cryptohome_client.h

Index: chromeos/dbus/mock_cryptohome_client.h
diff --git a/chromeos/dbus/mock_cryptohome_client.h b/chromeos/dbus/mock_cryptohome_client.h
index 7dc27b9381dd38d3e64d47c7a837047218af09a3..68ad58f9ff5a5f8401e39a0766a5fab51c78509d 100644
--- a/chromeos/dbus/mock_cryptohome_client.h
+++ b/chromeos/dbus/mock_cryptohome_client.h
@@ -222,6 +222,12 @@ class MockCryptohomeClient : public CryptohomeClient {
       FlushAndSignBootAttributes,
       void(const cryptohome::FlushAndSignBootAttributesRequest& request,
            const ProtobufMethodCallback& callback));
+  MOCK_METHOD3(MigrateToDircrypto,
+               void(const cryptohome::Identification& cryptohome_id,
+                    const cryptohome::AuthorizationRequest& auth,
+                    const VoidDBusMethodCallback& callback));
+  MOCK_METHOD1(SetDircryptoMigrationProgressHandler,
+               void(const DircryptoMigrationProgessHandler& handler));
 };
 
 }  // namespace chromeos