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diff --git a/web/modules/contrib/devel/src/Form/SystemStateEdit.php b/web/modules/contrib/devel/src/Form/SystemStateEdit.php
new file mode 100644
index 000000000..d4ba0eda4
--- /dev/null
+++ b/web/modules/contrib/devel/src/Form/SystemStateEdit.php
@@ -0,0 +1,189 @@
+<?php
+
+namespace Drupal\devel\Form;
+
+use Drupal\Component\Serialization\Exception\InvalidDataTypeException;
+use Drupal\Component\Serialization\Yaml;
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\State\StateInterface;
+use Drupal\Core\Url;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Form API form to edit a state.
+ */
+class SystemStateEdit extends FormBase {
+
+  /**
+   * The state store.
+   *
+   * @var \Drupal\Core\State\StateInterface
+   */
+  protected $state;
+
+  /**
+   * Constructs a new SystemStateEdit object.
+   *
+   * @param \Drupal\Core\State\StateInterface $state
+   *   The state service.
+   */
+  public function __construct(StateInterface $state) {
+    $this->state = $state;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('state')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'devel_state_system_edit_form';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $state_name = '') {
+    // Get the old value
+    $old_value = $this->state->get($state_name);
+
+    if (!isset($old_value)) {
+      drupal_set_message(t('State @name does not exist in the system.', array('@name' => $state_name)), 'warning');
+      return;
+    }
+
+    // Only simple structures are allowed to be edited.
+    $disabled = !$this->checkObject($old_value);
+
+    if ($disabled) {
+      drupal_set_message(t('Only simple structures are allowed to be edited. State @name contains objects.', array('@name' => $state_name)), 'warning');
+    }
+
+    // First we will show the user the content of the variable about to be edited.
+    $form['value'] = array(
+      '#type' => 'item',
+      '#title' => $this->t('Current value for %name', array('%name' => $state_name)),
+      '#markup' => kpr($old_value, TRUE),
+    );
+
+    $transport = 'plain';
+
+    if (!$disabled && is_array($old_value)) {
+      try {
+        $old_value = Yaml::encode($old_value);
+        $transport = 'yaml';
+      }
+      catch (InvalidDataTypeException $e) {
+        drupal_set_message(t('Invalid data detected for @name : %error', array('@name' => $state_name, '%error' => $e->getMessage())), 'error');
+        return;
+      }
+    }
+
+    // Store in the form the name of the state variable
+    $form['state_name'] = array(
+      '#type' => 'value',
+      '#value' => $state_name,
+    );
+    // Set the transport format for the new value. Values:
+    //  - plain
+    //  - yaml
+    $form['transport'] = array(
+      '#type' => 'value',
+      '#value' => $transport,
+    );
+
+    $form['new_value'] = array(
+      '#type' => 'textarea',
+      '#title' => $this->t('New value'),
+      '#default_value' => $disabled ? '' : $old_value,
+      '#disabled' => $disabled,
+      '#rows' => 15,
+    );
+
+    $form['actions'] = array('#type' => 'actions');
+    $form['actions']['submit'] = array(
+      '#type' => 'submit',
+      '#value' => $this->t('Save'),
+      '#disabled' => $disabled,
+    );
+    $form['actions']['cancel'] = array(
+      '#type' => 'link',
+      '#title' => $this->t('Cancel'),
+      '#url' => Url::fromRoute('devel.state_system_page')
+    );
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateForm(array &$form, FormStateInterface $form_state) {
+    $values = $form_state->getValues();
+
+    if ($values['transport'] == 'yaml') {
+      // try to parse the new provided value
+      try {
+        $parsed_value = Yaml::decode($values['new_value']);
+        $form_state->setValue('parsed_value', $parsed_value);
+      }
+      catch (InvalidDataTypeException $e) {
+        $form_state->setErrorByName('new_value', $this->t('Invalid input: %error', array('%error' => $e->getMessage())));
+      }
+    }
+    else {
+      $form_state->setValue('parsed_value', $values['new_value']);
+    }
+
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    // Save the state
+    $values = $form_state->getValues();
+    $this->state->set($values['state_name'], $values['parsed_value']);
+
+    $form_state->setRedirectUrl(Url::fromRoute('devel.state_system_page'));
+
+    drupal_set_message($this->t('Variable %variable was successfully edited.', array('%variable' => $values['state_name'])));
+    $this->logger('devel')->info('Variable %variable was successfully edited.', array('%variable' => $values['state_name']));
+  }
+
+  /**
+   * Helper function to determine if a variable is or contains an object.
+   *
+   * @param $data
+   *   Input data to check
+   *
+   * @return bool
+   *   TRUE if the variable is not an object and does not contain one.
+   */
+  protected function checkObject($data) {
+    if (is_object($data)) {
+      return FALSE;
+    }
+    if (is_array($data)) {
+      // If the current object is an array, then check recursively.
+      foreach ($data as $value) {
+        // If there is an object the whole container is "contaminated"
+        if (!$this->checkObject($value)) {
+          return FALSE;
+        }
+      }
+    }
+
+    // All checks pass
+    return TRUE;
+  }
+
+}