re-add and improve the documented variables on the handler

lib/Drupal/views/Plugin/views/Handler.php

@@ -11,10 +11,68 @@
 
 class Handler extends Plugin {
   /**
-   * init the handler with necessary data.
-   * @param $view
+   * Where the $query object will reside:
+   *
+   * @var Drupal\views\Plugin\views\query\QueryPluginBase
+   */
+  public $query = NULL;
+
+  /**
+   * The table this handler is attached to.
+   *
+   * @var string
+   */
+  public $table;
+
+  /**
+   * The alias of the table of this handler which is used in the query.
+   *
+   * @var string
+   */
+  public $table_alias;
+
+  /**
+   * When a table has been moved this property is set.
+   *
+   * @var string
+   */
+  public $actual_table;
+
+  /**
+   * The actual field in the database table, maybe different
+   * on other kind of query plugins/special handlers.
+   *
+   * @var string
+   */
+  public $real_field;
+
+  /**
+   * With field you can override the real_field if the real field is not set.
+   *
+   * @var string
+   */
+  public $field;
+
+  /**
+   * When a field has been moved this property is set.
+   *
+   * @var string
+   */
+  public $actual_field;
+
+  /**
+   * The relationship used for this field.
+   *
+   * @var string
+   */
+  public $relationship = NULL;
+
+  /**
+   * Init the handler with necessary data.
+   *
+   * @param Drupal\views\View $view
    *   The $view object this handler is attached to.
-   * @param $options
+   * @param array $options
    *   The item from the database; the actual contents of this will vary
    *   based upon the type of handler.
    */

lib/Drupal/views/Plugin/views/Plugin.php

@@ -13,27 +13,38 @@ abstract class Plugin extends PluginBase {
 
   /**
    * Except for displays, options for the object will be held here.
+   *
+   * @var array
    */
-  var $options = array();
+  public $options = array();
 
   /**
    * The top object of a view.
    *
-   * @var view
+   * @var Drupal\views\View
    */
-  var $view = NULL;
+  public $view = NULL;
 
   /**
-   * Handler's definition
+   * Plugins's definition
    *
    * @var array
    */
-  var $definition;
+  public $definition;
 
   /**
    * The plugin type of this plugin, for example style or query.
    */
-  var $plugin_type = NULL;
+  public $plugin_type = NULL;
+
+  /**
+   * An array which identifies the instance in the views plugin hierarchy.
+   *
+   * For handlers this is for example display_id, type, table, id.
+   *
+   * @var array
+   */
+  public $localization_keys;
 
   /**
    * Constructs a Plugin object.