WP_CLI::get_http_cache_manager PHP Method

    public static function get_http_cache_manager()
    {
        static $http_cacher;
        if (!$http_cacher) {
            $http_cacher = new WpHttpCacheManager(self::get_cache());
        }
        return $http_cacher;
    }

 protected function install_from_repo($slug, $assoc_args)
 {
     $api = themes_api('theme_information', array('slug' => $slug));
     if (is_wp_error($api)) {
         return $api;
     }
     if (isset($assoc_args['version'])) {
         self::alter_api_response($api, $assoc_args['version']);
     }
     if (!isset($assoc_args['force']) && wp_get_theme($slug)->exists()) {
         // We know this will fail, so avoid a needless download of the package.
         return new WP_Error('already_installed', 'Theme already installed.');
     }
     WP_CLI::log(sprintf('Installing %s (%s)', $api->name, $api->version));
     if (!isset($assoc_args['version']) || 'dev' !== $assoc_args['version']) {
         WP_CLI::get_http_cache_manager()->whitelist_package($api->download_link, $this->item_type, $api->slug, $api->version);
     }
     $result = $this->get_upgrader($assoc_args)->install($api->download_link);
     return $result;
 }