services:
  plugin.manager.block:
    class: Drupal\block\Plugin\Type\BlockManager
    arguments: ['@container.namespaces', '@cache.discovery', '@language_manager', '@module_handler', '@string_translation']
  theme.negotiator.block.admin_demo:
    class: Drupal\block\Theme\AdminDemoNegotiator
    tags:
      - { name: theme_negotiator, priority: 1000 }