Add non-host functionality to the previews blacklist

components/previews/core/previews_opt_out_store.h

Index: components/previews/core/previews_opt_out_store.h
diff --git a/components/previews/core/previews_opt_out_store.h b/components/previews/core/previews_opt_out_store.h
index 5e078686c03328924b8feff41af47639bba29191..7f81e3a50d710e9651d10bf96cdc1c6db0b2b7db 100644
--- a/components/previews/core/previews_opt_out_store.h
+++ b/components/previews/core/previews_opt_out_store.h
@@ -17,21 +17,22 @@
 #include "components/previews/core/previews_black_list_item.h"
 #include "components/previews/core/previews_experiments.h"
 
 class GURL;
 
 namespace previews {
 
 typedef std::unordered_map<std::string, std::unique_ptr<PreviewsBlackListItem>>
     BlackListItemMap;
 
-typedef base::Callback<void(std::unique_ptr<BlackListItemMap>)>
+typedef base::Callback<void(std::unique_ptr<BlackListItemMap>,
+                            std::unique_ptr<PreviewsBlackListItem>)>
     LoadBlackListCallback;
 
 // PreviewsOptOutStore keeps opt out information for the previews.
 // Ability to create multiple instances of the store as well as behavior of
 // asynchronous operations when the object is being destroyed, before such
 // operation finishes will depend on implementation. It is possible to issue
 // multiple asynchronous operations in parallel and maintain ordering.
 class PreviewsOptOutStore {
  public:
   virtual ~PreviewsOptOutStore() {}