Send the list of used and unused resources for precache

components/precache/content/precache_manager.h

Index: components/precache/content/precache_manager.h
diff --git a/components/precache/content/precache_manager.h b/components/precache/content/precache_manager.h
index 0c1dc18e753beb7edfcb7d5da7d9178d5641bd1e..1da864bc2984ceca1785222331ce13b798973abc 100644
--- a/components/precache/content/precache_manager.h
+++ b/components/precache/content/precache_manager.h
@@ -117,6 +117,7 @@ class PrecacheManager : public KeyedService,
                                      bool is_user_traffic);
 
  private:
+  friend class PrecacheManagerTest;
   FRIEND_TEST_ALL_PREFIXES(PrecacheManagerTest, DeleteExpiredPrecacheHistory);
   FRIEND_TEST_ALL_PREFIXES(PrecacheManagerTest,
                            RecordStatsForFetchDuringPrecaching);
@@ -169,6 +170,7 @@ class PrecacheManager : public KeyedService,
   // Update precache-related metrics in response to a URL being fetched. Called
   // by RecordStatsForFetch() by way of an asynchronous HistoryService callback.
   void RecordStatsForFetchInternal(const GURL& url,
+                                   const std::string& referrer_host,
                                    const base::TimeDelta& latency,
                                    const base::Time& fetch_time,
                                    const net::HttpResponseInfo& info,