diff --git a/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Block/AggregatorCategoryBlock.php b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Block/AggregatorCategoryBlock.php
index b9971ce..423c903 100644
--- a/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Block/AggregatorCategoryBlock.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Block/AggregatorCategoryBlock.php
@@ -62,9 +62,9 @@ public function blockSubmit($form, &$form_state) {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     $id = $this->getPluginId();
     if ($category = db_query('SELECT cid, title, block FROM {aggregator_category} WHERE cid = :cid', array(':cid' => $id))->fetchObject()) {
       $result = db_query_range('SELECT i.* FROM {aggregator_category_item} ci LEFT JOIN {aggregator_item} i ON ci.iid = i.iid WHERE ci.cid = :cid ORDER BY i.timestamp DESC, i.iid DESC', 0, $this->configuration['block_count'], array(':cid' => $category->cid));
diff --git a/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Block/AggregatorFeedBlock.php b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Block/AggregatorFeedBlock.php
index b72936b..3cd519f 100644
--- a/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Block/AggregatorFeedBlock.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Block/AggregatorFeedBlock.php
@@ -62,9 +62,9 @@ public function blockSubmit($form, &$form_state) {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     // Plugin IDs look something like this: aggregator_feed_block:1.
     list(, $id) = explode(':', $this->getPluginId());
     if ($feed = db_query('SELECT fid, title, block FROM {aggregator_feed} WHERE block <> 0 AND fid = :fid', array(':fid' => $id))->fetchObject()) {
diff --git a/core/modules/block/custom_block/lib/Drupal/custom_block/Plugin/Block/CustomBlockBlock.php b/core/modules/block/custom_block/lib/Drupal/custom_block/Plugin/Block/CustomBlockBlock.php
index 01b11ba..0d17fa1 100644
--- a/core/modules/block/custom_block/lib/Drupal/custom_block/Plugin/Block/CustomBlockBlock.php
+++ b/core/modules/block/custom_block/lib/Drupal/custom_block/Plugin/Block/CustomBlockBlock.php
@@ -67,9 +67,9 @@ public function blockSubmit($form, &$form_state) {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     // @todo Clean up when http://drupal.org/node/1874498 lands.
     list(, $uuid) = explode(':', $this->getPluginId());
     if ($block = entity_load_by_uuid('custom_block', $uuid)) {
diff --git a/core/modules/block/lib/Drupal/block/BlockBase.php b/core/modules/block/lib/Drupal/block/BlockBase.php
index 57ff44d..7464c07 100644
--- a/core/modules/block/lib/Drupal/block/BlockBase.php
+++ b/core/modules/block/lib/Drupal/block/BlockBase.php
@@ -224,33 +224,4 @@ public function submit($form, &$form_state) {
    * @see \Drupal\block\BlockBase::submit()
    */
   public function blockSubmit($form, &$form_state) {}
-
-  /**
-   * Implements \Drupal\block\BlockInterface::build().
-   */
-  public function build() {
-    $build = array();
-    $plugin_id = $this->getPluginId();
-    if ($content = $this->blockBuild()) {
-      $build = array(
-        '#theme' => 'block',
-        'content' => $content,
-        '#configuration' => $this->configuration,
-        '#plugin_id' => $plugin_id,
-      );
-      $build['#configuration']['label'] = check_plain($this->configuration['label']);
-    }
-    list($base_id) = explode(':', $plugin_id);
-    drupal_alter(array('block_view', "block_view_$base_id"), $build, $this);
-    return $build;
-  }
-
-  /**
-   * Adds block-type-specific render handling for the block plugin.
-   *
-   * @return array
-   *   A renderable array representing the content of this block.
-   */
-  abstract protected function blockBuild();
-
 }
diff --git a/core/modules/block/lib/Drupal/block/BlockRenderController.php b/core/modules/block/lib/Drupal/block/BlockRenderController.php
index 12fff82..a2fe80b 100644
--- a/core/modules/block/lib/Drupal/block/BlockRenderController.php
+++ b/core/modules/block/lib/Drupal/block/BlockRenderController.php
@@ -36,7 +36,22 @@ public function view(EntityInterface $entity, $view_mode = 'full', $langcode = N
   public function viewMultiple(array $entities = array(), $view_mode = 'full', $langcode = NULL) {
     $build = array();
     foreach ($entities as $entity_id => $entity) {
-      $build[$entity_id] = $entity->getPlugin()->build();
+      $plugin = $entity->getPlugin();
+      $plugin_id = $plugin->getPluginId();
+
+      if ($content = $plugin->build()) {
+        $configuration = $plugin->getConfig();
+        $build[$entity_id] = array(
+          '#theme' => 'block',
+          'content' => $content,
+          '#configuration' => $configuration,
+          '#plugin_id' => $plugin_id,
+        );
+        $build[$entity_id]['#configuration']['label'] = check_plain($configuration['label']);
+      }
+
+      list($base_id) = explode(':', $plugin_id);
+      drupal_alter(array('block_view', "block_view_$base_id"), $build, $plugin);
 
       // @todo Remove after fixing http://drupal.org/node/1989568.
       $build[$entity_id]['#block'] = $entity;
diff --git a/core/modules/block/lib/Drupal/block/Tests/BlockInterfaceTest.php b/core/modules/block/lib/Drupal/block/Tests/BlockInterfaceTest.php
index 58ff0c2..e71a146 100644
--- a/core/modules/block/lib/Drupal/block/Tests/BlockInterfaceTest.php
+++ b/core/modules/block/lib/Drupal/block/Tests/BlockInterfaceTest.php
@@ -92,18 +92,7 @@ public function testBlockInterface() {
     $this->assertIdentical($display_block->form(array(), $form_state), $expected_form, 'Only the expected form elements were present.');
 
     $expected_build = array(
-      '#theme' => 'block',
-      'content' => array(
-        '#children' => 'My custom display message.',
-      ),
-      '#configuration' => array(
-        'label' => 'Custom Display Message',
-        'display_message' => 'My custom display message.',
-        'module' => 'block_test',
-        'label_display' => BLOCK_LABEL_VISIBLE,
-        'cache' => DRUPAL_NO_CACHE,
-      ),
-      '#plugin_id' => 'test_block_instantiation',
+      '#children' => 'My custom display message.',
     );
     // Ensure the build array is proper.
     $this->assertIdentical($display_block->build(), $expected_build, 'The plugin returned the appropriate build array.');
diff --git a/core/modules/block/tests/lib/Drupal/block_test/Plugin/Block/TestBlockInstantiation.php b/core/modules/block/tests/lib/Drupal/block_test/Plugin/Block/TestBlockInstantiation.php
index ba45a4e..4c28638 100644
--- a/core/modules/block/tests/lib/Drupal/block_test/Plugin/Block/TestBlockInstantiation.php
+++ b/core/modules/block/tests/lib/Drupal/block_test/Plugin/Block/TestBlockInstantiation.php
@@ -60,7 +60,7 @@ public function blockSubmit($form, &$form_state) {
   /**
    * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     return array(
       '#children' => $this->configuration['display_message'],
     );
diff --git a/core/modules/block/tests/lib/Drupal/block_test/Plugin/Block/TestCacheBlock.php b/core/modules/block/tests/lib/Drupal/block_test/Plugin/Block/TestCacheBlock.php
index 1bde917..c83d668 100644
--- a/core/modules/block/tests/lib/Drupal/block_test/Plugin/Block/TestCacheBlock.php
+++ b/core/modules/block/tests/lib/Drupal/block_test/Plugin/Block/TestCacheBlock.php
@@ -34,9 +34,9 @@ public function settings() {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     return array(
       '#children' => \Drupal::state()->get('block_test.content'),
     );
diff --git a/core/modules/book/lib/Drupal/book/Plugin/Block/BookNavigationBlock.php b/core/modules/book/lib/Drupal/book/Plugin/Block/BookNavigationBlock.php
index 7461aa7..fd48f7d 100644
--- a/core/modules/book/lib/Drupal/book/Plugin/Block/BookNavigationBlock.php
+++ b/core/modules/book/lib/Drupal/book/Plugin/Block/BookNavigationBlock.php
@@ -59,9 +59,9 @@ public function blockSubmit($form, &$form_state) {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     $current_bid = 0;
     if ($node = menu_get_object()) {
       $current_bid = empty($node->book['bid']) ? 0 : $node->book['bid'];
diff --git a/core/modules/comment/lib/Drupal/comment/Plugin/Block/RecentCommentsBlock.php b/core/modules/comment/lib/Drupal/comment/Plugin/Block/RecentCommentsBlock.php
index 387f7ce..cf442db 100644
--- a/core/modules/comment/lib/Drupal/comment/Plugin/Block/RecentCommentsBlock.php
+++ b/core/modules/comment/lib/Drupal/comment/Plugin/Block/RecentCommentsBlock.php
@@ -59,9 +59,9 @@ public function blockSubmit($form, &$form_state) {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     return array(
       '#theme' => 'comment_block',
       '#number' => $this->configuration['block_count'],
diff --git a/core/modules/forum/lib/Drupal/forum/Plugin/Block/ActiveTopicsBlock.php b/core/modules/forum/lib/Drupal/forum/Plugin/Block/ActiveTopicsBlock.php
index b522d65..176fa14 100644
--- a/core/modules/forum/lib/Drupal/forum/Plugin/Block/ActiveTopicsBlock.php
+++ b/core/modules/forum/lib/Drupal/forum/Plugin/Block/ActiveTopicsBlock.php
@@ -22,9 +22,9 @@
 class ActiveTopicsBlock extends ForumBlockBase {
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     $query = db_select('forum_index', 'f')
       ->fields('f')
       ->addTag('node_access')
diff --git a/core/modules/forum/lib/Drupal/forum/Plugin/Block/NewTopicsBlock.php b/core/modules/forum/lib/Drupal/forum/Plugin/Block/NewTopicsBlock.php
index 4e85482..02f4650 100644
--- a/core/modules/forum/lib/Drupal/forum/Plugin/Block/NewTopicsBlock.php
+++ b/core/modules/forum/lib/Drupal/forum/Plugin/Block/NewTopicsBlock.php
@@ -22,9 +22,9 @@
 class NewTopicsBlock extends ForumBlockBase {
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     $query = db_select('forum_index', 'f')
       ->fields('f')
       ->addTag('node_access')
diff --git a/core/modules/language/lib/Drupal/language/Plugin/Block/LanguageBlock.php b/core/modules/language/lib/Drupal/language/Plugin/Block/LanguageBlock.php
index 4ab3bfd..95a9d12 100644
--- a/core/modules/language/lib/Drupal/language/Plugin/Block/LanguageBlock.php
+++ b/core/modules/language/lib/Drupal/language/Plugin/Block/LanguageBlock.php
@@ -31,9 +31,9 @@ function access() {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     $build = array();
     $path = drupal_is_front_page() ? '<front>' : current_path();
     list($plugin_id, $type) = explode(':', $this->getPluginId());
diff --git a/core/modules/menu/lib/Drupal/menu/Plugin/Block/MenuBlock.php b/core/modules/menu/lib/Drupal/menu/Plugin/Block/MenuBlock.php
index 86dcd07..0e83734 100644
--- a/core/modules/menu/lib/Drupal/menu/Plugin/Block/MenuBlock.php
+++ b/core/modules/menu/lib/Drupal/menu/Plugin/Block/MenuBlock.php
@@ -24,9 +24,9 @@
 class MenuBlock extends SystemMenuBlock {
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     list($plugin, $menu) = explode(':', $this->getPluginId());
     return menu_tree($menu);
   }
diff --git a/core/modules/node/lib/Drupal/node/Plugin/Block/RecentContentBlock.php b/core/modules/node/lib/Drupal/node/Plugin/Block/RecentContentBlock.php
index 3712bff..8144161 100644
--- a/core/modules/node/lib/Drupal/node/Plugin/Block/RecentContentBlock.php
+++ b/core/modules/node/lib/Drupal/node/Plugin/Block/RecentContentBlock.php
@@ -59,9 +59,9 @@ public function blockSubmit($form, &$form_state) {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     if ($nodes = node_get_recent($this->configuration['block_count'])) {
       return array(
         '#theme' => 'node_recent_block',
diff --git a/core/modules/node/lib/Drupal/node/Plugin/Block/SyndicateBlock.php b/core/modules/node/lib/Drupal/node/Plugin/Block/SyndicateBlock.php
index 56b3a19..1440a48 100644
--- a/core/modules/node/lib/Drupal/node/Plugin/Block/SyndicateBlock.php
+++ b/core/modules/node/lib/Drupal/node/Plugin/Block/SyndicateBlock.php
@@ -39,9 +39,9 @@ public function access() {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     return array(
       '#theme' => 'feed_icon',
       '#url' => 'rss.xml',
diff --git a/core/modules/search/lib/Drupal/search/Plugin/Block/SearchBlock.php b/core/modules/search/lib/Drupal/search/Plugin/Block/SearchBlock.php
index 1afbfae..00f5b60 100644
--- a/core/modules/search/lib/Drupal/search/Plugin/Block/SearchBlock.php
+++ b/core/modules/search/lib/Drupal/search/Plugin/Block/SearchBlock.php
@@ -30,9 +30,9 @@ public function access() {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     return array(drupal_get_form('search_block_form'));
   }
 
diff --git a/core/modules/shortcut/lib/Drupal/shortcut/Plugin/Block/ShortcutsBlock.php b/core/modules/shortcut/lib/Drupal/shortcut/Plugin/Block/ShortcutsBlock.php
index ff89f50..5296971 100644
--- a/core/modules/shortcut/lib/Drupal/shortcut/Plugin/Block/ShortcutsBlock.php
+++ b/core/modules/shortcut/lib/Drupal/shortcut/Plugin/Block/ShortcutsBlock.php
@@ -23,9 +23,9 @@
 class ShortcutsBlock extends BlockBase {
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     return array(
       shortcut_renderable_links(shortcut_current_displayed_set()),
     );
diff --git a/core/modules/statistics/lib/Drupal/statistics/Plugin/Block/StatisticsPopularBlock.php b/core/modules/statistics/lib/Drupal/statistics/Plugin/Block/StatisticsPopularBlock.php
index 6eebb83..d11412e 100644
--- a/core/modules/statistics/lib/Drupal/statistics/Plugin/Block/StatisticsPopularBlock.php
+++ b/core/modules/statistics/lib/Drupal/statistics/Plugin/Block/StatisticsPopularBlock.php
@@ -116,9 +116,9 @@ public function blockSubmit($form, &$form_state) {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     $content = array();
 
     if ($this->day_list) {
diff --git a/core/modules/system/lib/Drupal/system/Plugin/Block/SystemHelpBlock.php b/core/modules/system/lib/Drupal/system/Plugin/Block/SystemHelpBlock.php
index a370374..c19a575 100644
--- a/core/modules/system/lib/Drupal/system/Plugin/Block/SystemHelpBlock.php
+++ b/core/modules/system/lib/Drupal/system/Plugin/Block/SystemHelpBlock.php
@@ -38,9 +38,9 @@ public function access() {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     return array(
       '#children' => $this->help,
     );
diff --git a/core/modules/system/lib/Drupal/system/Plugin/Block/SystemMainBlock.php b/core/modules/system/lib/Drupal/system/Plugin/Block/SystemMainBlock.php
index db18651..997d563 100644
--- a/core/modules/system/lib/Drupal/system/Plugin/Block/SystemMainBlock.php
+++ b/core/modules/system/lib/Drupal/system/Plugin/Block/SystemMainBlock.php
@@ -23,9 +23,9 @@
 class SystemMainBlock extends BlockBase {
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     return array(
       drupal_set_page_content()
     );
diff --git a/core/modules/system/lib/Drupal/system/Plugin/Block/SystemMenuBlock.php b/core/modules/system/lib/Drupal/system/Plugin/Block/SystemMenuBlock.php
index 847249e..8e7879e 100644
--- a/core/modules/system/lib/Drupal/system/Plugin/Block/SystemMenuBlock.php
+++ b/core/modules/system/lib/Drupal/system/Plugin/Block/SystemMenuBlock.php
@@ -33,9 +33,9 @@ public function access() {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     list($plugin, $derivative) = explode(':', $this->getPluginId());
     // Derivatives are prefixed with 'menu-'.
     $menu = substr($derivative, 5);
diff --git a/core/modules/system/lib/Drupal/system/Plugin/Block/SystemPoweredByBlock.php b/core/modules/system/lib/Drupal/system/Plugin/Block/SystemPoweredByBlock.php
index 3969710..7edd34b 100644
--- a/core/modules/system/lib/Drupal/system/Plugin/Block/SystemPoweredByBlock.php
+++ b/core/modules/system/lib/Drupal/system/Plugin/Block/SystemPoweredByBlock.php
@@ -23,9 +23,9 @@
 class SystemPoweredByBlock extends BlockBase {
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     return array(
       '#children' => theme('system_powered_by'),
     );
diff --git a/core/modules/user/lib/Drupal/user/Plugin/Block/UserLoginBlock.php b/core/modules/user/lib/Drupal/user/Plugin/Block/UserLoginBlock.php
index dd890bd..0c8aa2a 100644
--- a/core/modules/user/lib/Drupal/user/Plugin/Block/UserLoginBlock.php
+++ b/core/modules/user/lib/Drupal/user/Plugin/Block/UserLoginBlock.php
@@ -30,9 +30,9 @@ public function access() {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     $form = drupal_get_form('user_login_form');
     unset($form['name']['#attributes']['autofocus']);
     unset($form['name']['#description']);
diff --git a/core/modules/user/lib/Drupal/user/Plugin/Block/UserNewBlock.php b/core/modules/user/lib/Drupal/user/Plugin/Block/UserNewBlock.php
index 41c2a43..847512a 100644
--- a/core/modules/user/lib/Drupal/user/Plugin/Block/UserNewBlock.php
+++ b/core/modules/user/lib/Drupal/user/Plugin/Block/UserNewBlock.php
@@ -62,9 +62,9 @@ public function blockSubmit($form, &$form_state) {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     // Retrieve a list of new users who have accessed the site successfully.
     $items = db_query_range('SELECT uid, name FROM {users} WHERE status <> 0 AND access <> 0 ORDER BY created DESC', 0, $this->configuration['whois_new_count'])->fetchAll();
     $build = array(
diff --git a/core/modules/user/lib/Drupal/user/Plugin/Block/UserOnlineBlock.php b/core/modules/user/lib/Drupal/user/Plugin/Block/UserOnlineBlock.php
index fbae351..f2452c9 100644
--- a/core/modules/user/lib/Drupal/user/Plugin/Block/UserOnlineBlock.php
+++ b/core/modules/user/lib/Drupal/user/Plugin/Block/UserOnlineBlock.php
@@ -76,9 +76,9 @@ public function blockSubmit($form, &$form_state) {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     // Count users active within the defined period.
     $interval = REQUEST_TIME - $this->configuration['seconds_online'];
 
diff --git a/core/modules/views/lib/Drupal/views/Plugin/Block/ViewsBlock.php b/core/modules/views/lib/Drupal/views/Plugin/Block/ViewsBlock.php
index 5b82a7b..e9af634 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/Block/ViewsBlock.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/Block/ViewsBlock.php
@@ -69,9 +69,9 @@ public function form($form, &$form_state) {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     if ($output = $this->view->executeDisplay($this->displayID)) {
       $output = $this->view->executeDisplay($this->displayID);
       // Set the label to the title configured in the view.
diff --git a/core/modules/views/lib/Drupal/views/Plugin/Block/ViewsExposedFilterBlock.php b/core/modules/views/lib/Drupal/views/Plugin/Block/ViewsExposedFilterBlock.php
index 21d3578..577caa5 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/Block/ViewsExposedFilterBlock.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/Block/ViewsExposedFilterBlock.php
@@ -23,9 +23,9 @@
 class ViewsExposedFilterBlock extends ViewsBlock {
 
   /**
-   * Implements \Drupal\block\BlockBase::blockBuild().
+   * {@inheritdoc}
    */
-  protected function blockBuild() {
+  public function build() {
     $output = $this->view->display_handler->viewExposedFormBlocks();
     // Before returning the block output, convert it to a renderable array with
     // contextual links.