Add support to previews/ for Server LoFi and LitePages

components/previews/core/previews_black_list.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_PREVIEWS_CORE_PREVIEWS_BLACK_LIST_H_
 #define COMPONENTS_PREVIEWS_CORE_PREVIEWS_BLACK_LIST_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 31 matching lines @@
   // The user has opted out of previews often, and is no longer shown previews
   // on any host.
   USER_BLACKLISTED = 4,
   // The user has opted out of previews on a specific host often, and was not
   // not shown a previews on that host.
   HOST_BLACKLISTED = 5,
   // The network quality estimate is not available.
   NETWORK_QUALITY_UNAVAILABLE = 6,
   // The network was fast enough to not warrant previews.
   NETWORK_NOT_SLOW = 7,
-  // If the page was reloaded, the user should not be shown an offline preview.
-  RELOAD_DISALLOWED_FOR_OFFLINE = 8,
+  // If the page was reloaded, the user should not be shown a stale preview.
+  RELOAD_DISALLOWED = 8,
   LAST = 9,
 };
 
 // Manages the state of black listed domains for the previews experiment. Loads
 // the stored black list from |opt_out_store| and manages an in memory black
 // list on the IO thread. Updates to the black list are stored in memory and
 // pushed to the store. Asynchronous modifications are stored in a queue and
 // executed in order. Reading from the black list is always synchronous, and if
 // the black list is not currently loaded (e.g., at startup, after clearing
 // browsing history), domains are reported as black listed. The list stores no
@@ skipping 86 matching lines @@
   base::ThreadChecker thread_checker_;
 
   base::WeakPtrFactory<PreviewsBlackList> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PreviewsBlackList);
 };
 
 }  // namespace previews
 
 #endif  // COMPONENTS_PREVIEWS_CORE_PREVIEWS_BLACK_LIST_H_