Add support to previews/ for Server LoFi and LitePages

components/previews/core/previews_experiments.h

Index: components/previews/core/previews_experiments.h
diff --git a/components/previews/core/previews_experiments.h b/components/previews/core/previews_experiments.h
index a41f02fef613e95581ef9e4840a58c0c0ada3971..9c9c8e5b9221333f27a86df7461d17544e992def 100644
--- a/components/previews/core/previews_experiments.h
+++ b/components/previews/core/previews_experiments.h
@@ -64,9 +64,13 @@ enum class PreviewsType {
   NONE = 0,
   // The user is shown an offline page as a preview.
   OFFLINE = 1,
+  // The user is shown a server lite page.
+  LITE_PAGE = 2,
+  // The user is shown a server LoFi page.
+  SERVER_LOFI = 3,
   // Insert new enum values here. Keep values sequential to allow looping
   // from NONE+1 to LAST-1.
-  LAST = 2,
+  LAST = 4,
 };
 
 typedef std::vector<std::pair<PreviewsType, int>> PreviewsTypeList;