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diff --git a/web/core/modules/image/src/Form/ImageStyleEditForm.php b/web/core/modules/image/src/Form/ImageStyleEditForm.php
new file mode 100644
index 000000000..574d9145a
--- /dev/null
+++ b/web/core/modules/image/src/Form/ImageStyleEditForm.php
@@ -0,0 +1,282 @@
+<?php
+
+namespace Drupal\image\Form;
+
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+use Drupal\image\ConfigurableImageEffectInterface;
+use Drupal\image\ImageEffectManager;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Controller for image style edit form.
+ */
+class ImageStyleEditForm extends ImageStyleFormBase {
+
+  /**
+   * The image effect manager service.
+   *
+   * @var \Drupal\image\ImageEffectManager
+   */
+  protected $imageEffectManager;
+
+  /**
+   * Constructs an ImageStyleEditForm object.
+   *
+   * @param \Drupal\Core\Entity\EntityStorageInterface $image_style_storage
+   *   The storage.
+   * @param \Drupal\image\ImageEffectManager $image_effect_manager
+   *   The image effect manager service.
+   */
+  public function __construct(EntityStorageInterface $image_style_storage, ImageEffectManager $image_effect_manager) {
+    parent::__construct($image_style_storage);
+    $this->imageEffectManager = $image_effect_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('entity.manager')->getStorage('image_style'),
+      $container->get('plugin.manager.image.effect')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function form(array $form, FormStateInterface $form_state) {
+    $user_input = $form_state->getUserInput();
+    $form['#title'] = $this->t('Edit style %name', ['%name' => $this->entity->label()]);
+    $form['#tree'] = TRUE;
+    $form['#attached']['library'][] = 'image/admin';
+
+    // Show the thumbnail preview.
+    $preview_arguments = ['#theme' => 'image_style_preview', '#style' => $this->entity];
+    $form['preview'] = [
+      '#type' => 'item',
+      '#title' => $this->t('Preview'),
+      '#markup' => drupal_render($preview_arguments),
+      // Render preview above parent elements.
+      '#weight' => -5,
+    ];
+
+    // Build the list of existing image effects for this image style.
+    $form['effects'] = [
+      '#type' => 'table',
+      '#header' => [
+        $this->t('Effect'),
+        $this->t('Weight'),
+        $this->t('Operations'),
+      ],
+      '#tabledrag' => [
+        [
+          'action' => 'order',
+          'relationship' => 'sibling',
+          'group' => 'image-effect-order-weight',
+        ],
+      ],
+      '#attributes' => [
+        'id' => 'image-style-effects',
+      ],
+      '#empty' => t('There are currently no effects in this style. Add one by selecting an option below.'),
+      // Render effects below parent elements.
+      '#weight' => 5,
+    ];
+    foreach ($this->entity->getEffects() as $effect) {
+      $key = $effect->getUuid();
+      $form['effects'][$key]['#attributes']['class'][] = 'draggable';
+      $form['effects'][$key]['#weight'] = isset($user_input['effects']) ? $user_input['effects'][$key]['weight'] : NULL;
+      $form['effects'][$key]['effect'] = [
+        '#tree' => FALSE,
+        'data' => [
+          'label' => [
+            '#plain_text' => $effect->label(),
+          ],
+        ],
+      ];
+
+      $summary = $effect->getSummary();
+
+      if (!empty($summary)) {
+        $summary['#prefix'] = ' ';
+        $form['effects'][$key]['effect']['data']['summary'] = $summary;
+      }
+
+      $form['effects'][$key]['weight'] = [
+        '#type' => 'weight',
+        '#title' => $this->t('Weight for @title', ['@title' => $effect->label()]),
+        '#title_display' => 'invisible',
+        '#default_value' => $effect->getWeight(),
+        '#attributes' => [
+          'class' => ['image-effect-order-weight'],
+        ],
+      ];
+
+      $links = [];
+      $is_configurable = $effect instanceof ConfigurableImageEffectInterface;
+      if ($is_configurable) {
+        $links['edit'] = [
+          'title' => $this->t('Edit'),
+          'url' => Url::fromRoute('image.effect_edit_form', [
+            'image_style' => $this->entity->id(),
+            'image_effect' => $key,
+          ]),
+        ];
+      }
+      $links['delete'] = [
+        'title' => $this->t('Delete'),
+        'url' => Url::fromRoute('image.effect_delete', [
+          'image_style' => $this->entity->id(),
+          'image_effect' => $key,
+        ]),
+      ];
+      $form['effects'][$key]['operations'] = [
+        '#type' => 'operations',
+        '#links' => $links,
+      ];
+    }
+
+    // Build the new image effect addition form and add it to the effect list.
+    $new_effect_options = [];
+    $effects = $this->imageEffectManager->getDefinitions();
+    uasort($effects, function ($a, $b) {
+      return strcasecmp($a['id'], $b['id']);
+    });
+    foreach ($effects as $effect => $definition) {
+      $new_effect_options[$effect] = $definition['label'];
+    }
+    $form['effects']['new'] = [
+      '#tree' => FALSE,
+      '#weight' => isset($user_input['weight']) ? $user_input['weight'] : NULL,
+      '#attributes' => ['class' => ['draggable']],
+    ];
+    $form['effects']['new']['effect'] = [
+      'data' => [
+        'new' => [
+          '#type' => 'select',
+          '#title' => $this->t('Effect'),
+          '#title_display' => 'invisible',
+          '#options' => $new_effect_options,
+          '#empty_option' => $this->t('Select a new effect'),
+        ],
+        [
+          'add' => [
+            '#type' => 'submit',
+            '#value' => $this->t('Add'),
+            '#validate' => ['::effectValidate'],
+            '#submit' => ['::submitForm', '::effectSave'],
+          ],
+        ],
+      ],
+      '#prefix' => '<div class="image-style-new">',
+      '#suffix' => '</div>',
+    ];
+
+    $form['effects']['new']['weight'] = [
+      '#type' => 'weight',
+      '#title' => $this->t('Weight for new effect'),
+      '#title_display' => 'invisible',
+      '#default_value' => count($this->entity->getEffects()) + 1,
+      '#attributes' => ['class' => ['image-effect-order-weight']],
+    ];
+    $form['effects']['new']['operations'] = [
+      'data' => [],
+    ];
+
+    return parent::form($form, $form_state);
+  }
+
+  /**
+   * Validate handler for image effect.
+   */
+  public function effectValidate($form, FormStateInterface $form_state) {
+    if (!$form_state->getValue('new')) {
+      $form_state->setErrorByName('new', $this->t('Select an effect to add.'));
+    }
+  }
+
+  /**
+   * Submit handler for image effect.
+   */
+  public function effectSave($form, FormStateInterface $form_state) {
+    $this->save($form, $form_state);
+
+    // Check if this field has any configuration options.
+    $effect = $this->imageEffectManager->getDefinition($form_state->getValue('new'));
+
+    // Load the configuration form for this option.
+    if (is_subclass_of($effect['class'], '\Drupal\image\ConfigurableImageEffectInterface')) {
+      $form_state->setRedirect(
+        'image.effect_add_form',
+        [
+          'image_style' => $this->entity->id(),
+          'image_effect' => $form_state->getValue('new'),
+        ],
+        ['query' => ['weight' => $form_state->getValue('weight')]]
+      );
+    }
+    // If there's no form, immediately add the image effect.
+    else {
+      $effect = [
+        'id' => $effect['id'],
+        'data' => [],
+        'weight' => $form_state->getValue('weight'),
+      ];
+      $effect_id = $this->entity->addImageEffect($effect);
+      $this->entity->save();
+      if (!empty($effect_id)) {
+        drupal_set_message($this->t('The image effect was successfully applied.'));
+      }
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+
+    // Update image effect weights.
+    if (!$form_state->isValueEmpty('effects')) {
+      $this->updateEffectWeights($form_state->getValue('effects'));
+    }
+
+    parent::submitForm($form, $form_state);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function save(array $form, FormStateInterface $form_state) {
+    parent::save($form, $form_state);
+    drupal_set_message($this->t('Changes to the style have been saved.'));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function actions(array $form, FormStateInterface $form_state) {
+    $actions = parent::actions($form, $form_state);
+    $actions['submit']['#value'] = $this->t('Update style');
+
+    return $actions;
+  }
+
+  /**
+   * Updates image effect weights.
+   *
+   * @param array $effects
+   *   Associative array with effects having effect uuid as keys and array
+   *   with effect data as values.
+   */
+  protected function updateEffectWeights(array $effects) {
+    foreach ($effects as $uuid => $effect_data) {
+      if ($this->entity->getEffects()->has($uuid)) {
+        $this->entity->getEffect($uuid)->setWeight($effect_data['weight']);
+      }
+    }
+  }
+
+}