If there are pending posts in a topic, display a message at the bottom

app/serializers/topic_view_serializer.rb

@@ -1,4 +1,5 @@
 require_dependency 'pinned_check'
+require_dependency 'new_post_manager'
 
 class TopicViewSerializer < ApplicationSerializer
   include PostStreamSerializerMixin
@@ -30,7 +31,8 @@ class TopicViewSerializer < ApplicationSerializer
                         :slug,
                         :category_id,
                         :word_count,
-                        :deleted_at
+                        :deleted_at,
+                        :pending_posts_count
 
   attributes :draft,
              :draft_key,
@@ -206,4 +208,8 @@ class TopicViewSerializer < ApplicationSerializer
     object.topic_user.try(:bookmarked)
   end
 
+  def include_pending_posts_count
+    scope.user.staff? && NewPostManager.queue_enabled?
+  end
+
 end