Custom views_handler_area to allow contextual filters for view areas, see issue at https://www.drupal.org/node/2407687.

viewsviewareafilters_handler_area_view.inc

<?php

/**
 * @file
 * Definition of views_handler_area_view.
 */

/**
 * Views area handlers. Insert a view inside of an area.
 *
 * @ingroup views_area_handlers
 */
class viewsviewareafilters_handler_area_view extends views_handler_area {

  function option_definition() {
    $options = parent::option_definition();

    $options['view_to_insert'] = array('default' => '');
    $options['inherit_arguments'] = array('default' => FALSE, 'bool' => TRUE);
    $options['custom_arguments'] = array('default' => '');
    return $options;
  }

  /**
   * Default options form that provides the label widget that all fields
   * should have.
   */
  function options_form(&$form, &$form_state) {
    parent::options_form($form, $form_state);

    $view_display = $this->view->name . ':' . $this->view->current_display;

    $options = array('' => t('-Select-'));
    $options += views_get_views_as_options(FALSE, 'all', $view_display, FALSE, TRUE);
    $form['view_to_insert'] = array(
      '#type' => 'select',
      '#title' => t('View to insert'),
      '#default_value' => $this->options['view_to_insert'],
      '#description' => t('The view to insert into this area.'),
      '#options' => $options,
    );

    $form['inherit_arguments'] = array(
      '#type' => 'checkbox',
      '#title' => t('Inherit contextual filters'),
      '#default_value' => $this->options['inherit_arguments'],
      '#description' => t('If checked, this view will receive the same contextual filters as its parent.'),
    );

    // Add extra text field for custom arguments.
    $form['custom_arguments'] = array(
      '#type' => 'textfield',
      '#title' => t('Custom contextual filters'),
      '#default_value' => $this->options['custom_arguments'],
      '#description' => t("Separate contextual filter values with a \"/\". For example, %example.", array('%example' => '40/12/10')) . ' ' . t('Custom values will be merged with optionally inherited values, leave a custom value blank to inherit the value. For example, %example.', array('%example' => '40//10')),
    );
  }

  /**
   * Render the area
   */
  function render($empty = FALSE) {
    if (!empty($this->options['view_to_insert'])) {
      list($view_name, $display_id) = explode(':', $this->options['view_to_insert']);

      $view = views_get_view($view_name);
      if (empty($view) || !$view->access($display_id)) {
        return;
      }
      $view->set_display($display_id);

      // Avoid recursion
      $view->parent_views += $this->view->parent_views;
      $view->parent_views[] = "$view_name:$display_id";

      // Check if the view is part of the parent views of this view
      $search = "$view_name:$display_id";
      if (in_array($search, $this->view->parent_views)) {
        drupal_set_message(t("Recursion detected in view @view display @display.", array('@view' => $view_name, '@display' => $display_id)), 'error');
      }
      elseif (!$empty || $this->options['empty']) {
        $arguments = array();

        // Inherit arguments from parent view.
        if (!empty($this->options['inherit_arguments']) && !empty($this->view->args)) {
          $arguments = $this->view->args;
        }

        // If custom arguments have been defined.
        if (!empty($this->options['custom_arguments'])) {
          // Add arguments to array manually so we can skip empty arguments to
          // not overwrite optionally inherited arguments.
          foreach (explode('/', $this->options['custom_arguments']) as $i => $argument) {
            // Only set argument if it has an actual value.
            if ($argument !== '') {
              $arguments[$i] = $argument;
            }
          }
        }

        return $view->preview($display_id, $arguments);
      }
    }
    return '';
  }
}