Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/image/src/ConfigurableImageEffectBase.php

@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\image\ConfigurableImageEffectBase.
+ */
+
+namespace Drupal\image;
+
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Provides a base class for configurable image effects.
+ *
+ * @see \Drupal\image\Annotation\ImageEffect
+ * @see \Drupal\image\ConfigurableImageEffectInterface
+ * @see \Drupal\image\ImageEffectInterface
+ * @see \Drupal\image\ImageEffectBase
+ * @see \Drupal\image\ImageEffectManager
+ * @see plugin_api
+ */
+abstract class ConfigurableImageEffectBase extends ImageEffectBase implements ConfigurableImageEffectInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
+  }
+
+}