Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/tracker/src/Plugin/Menu/UserTrackerTab.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\tracker\Plugin\Menu\UserTrackerTab.
+ */
+
+namespace Drupal\tracker\Plugin\Menu;
+
+use Drupal\Core\Menu\LocalTaskDefault;
+use Drupal\Core\Routing\RouteMatchInterface;
+
+/**
+ * Provides route parameters needed to link to the current user tracker tab.
+ */
+class UserTrackerTab extends LocalTaskDefault {
+
+  /**
+   * Current user object.
+   *
+   * @var \Drupal\Core\Session\AccountInterface
+   */
+  protected $currentUser;
+
+  /**
+   * Gets the current active user.
+   *
+   * @todo: https://www.drupal.org/node/2105123 put this method in
+   *   \Drupal\Core\Plugin\PluginBase instead.
+   *
+   * @return \Drupal\Core\Session\AccountInterface
+   */
+  protected function currentUser() {
+    if (!$this->currentUser) {
+      $this->currentUser = \Drupal::currentUser();
+    }
+    return $this->currentUser;
+  }
+
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getRouteParameters(RouteMatchInterface $route_match) {
+    return array('user' => $this->currentUser()->Id());
+  }
+
+}

core/modules/tracker/src/Plugin/views/argument/UserUid.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\tracker\Plugin\views\argument\UserUid.
+ */
+
+namespace Drupal\tracker\Plugin\views\argument;
+
+use Drupal\comment\Plugin\views\argument\UserUid as CommentUserUid;
+
+/**
+ * UID argument to check for nodes that user posted or commented on.
+ *
+ * @ingroup views_argument_handlers
+ *
+ * @ViewsArgument("tracker_user_uid")
+ */
+class UserUid extends CommentUserUid {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function query($group_by = FALSE) {
+    // Because this handler thinks it's an argument for a field on the {node}
+    // table, we need to make sure {tracker_user} is JOINed and use its alias
+    // for the WHERE clause.
+    $tracker_user_alias = $this->query->ensureTable('tracker_user');
+    $this->query->addWhere(0, "$tracker_user_alias.uid", $this->argument);
+  }
+
+}

core/modules/tracker/src/Plugin/views/filter/UserUid.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\tracker\Plugin\views\filter\UserUid.
+ */
+
+namespace Drupal\tracker\Plugin\views\filter;
+
+use Drupal\user\Plugin\views\filter\Name;
+
+/**
+ * UID filter to check for nodes that a user posted or commented on.
+ *
+ * @ingroup views_filter_handlers
+ *
+ * @ViewsFilter("tracker_user_uid")
+ */
+class UserUid extends Name {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function query() {
+    // Because this handler thinks it's an argument for a field on the {node}
+    // table, we need to make sure {tracker_user} is JOINed and use its alias
+    // for the WHERE clause.
+    $tracker_user_alias = $this->query->ensureTable('tracker_user');
+    // Cast scalars to array so we can consistently use an IN condition.
+    $this->query->addWhere(0, "$tracker_user_alias.uid", (array) $this->value, 'IN');
+  }
+
+}