Constructs a TipsBag object.
\Drupal\Component\Plugin\PluginManagerInterface $manager: The manager to be used for instantiating plugins.
array $configurations: (optional) An associative array containing the initial configuration for each tour in the bag, keyed by plugin instance ID.
public function __construct(PluginManagerInterface $manager, array $configurations = array()) {
$this->manager = $manager;
$this->configurations = $configurations;
if (!empty($configurations)) {
$this->instanceIDs = array_combine(array_keys($configurations), array_keys($configurations));
}
}