Set site engagement timestamps to privacy-respectful values when history is cleared.

components/history/core/browser/history_service.h

 // Copyright (c) 2012 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_HISTORY_CORE_BROWSER_HISTORY_SERVICE_H_
 #define COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 134 matching lines @@
   bool GetVisitCountForURL(const GURL& url, int* visit_count);
 
   // Returns a pointer to the TypedUrlSyncableService owned by HistoryBackend.
   // This method should only be called from the history thread, because the
   // returned service is intended to be accessed only via the history thread.
   TypedUrlSyncableService* GetTypedUrlSyncableService() const;
 
   // KeyedService:
   void Shutdown() override;
 
-  // Callback for value asynchronously returned by GetCountsForOrigins().
-  typedef base::Callback<void(const OriginCountMap&)>
-      GetCountsForOriginsCallback;
+  // Callback for value asynchronously returned by
+  // GetCountsAndLastVisitForOrigins().
+  typedef base::Callback<void(const OriginCountAndLastVisitMap&)>
+      GetCountsAndLastVisitForOriginsCallback;
 
   // Computes the |num_hosts| most-visited hostnames in the past 30 days and
   // returns a list of those hosts paired with their visit counts. The following
   // caveats apply:
   // 1. Hostnames are stripped of their 'www.' prefix. Visits to foo.com and
   //    www.foo.com are summed into the resultant foo.com entry.
   // 2. Ports and schemes are ignored. Visits to http://foo.com/ and
   //    https://foo.com:567/ are summed into the resultant foo.com entry.
   // 3. If the history is abnormally large and diverse, the function will give
   //    up early and return an approximate list.
   // 4. Only http://, https://, and ftp:// URLs are counted.
   //
   // Note: Virtual needed for mocking.
   virtual void TopHosts(size_t num_hosts,
                         const TopHostsCallback& callback) const;
 
-  // Gets the counts of URLs that belong to |origins| in the history database.
-  void GetCountsForOrigins(const std::set<GURL>& origins,
-                           const GetCountsForOriginsCallback& callback) const;
+  // Gets the counts and most recent visit date of URLs that belong to |origins|
+  // in the history database.
+  void GetCountsAndLastVisitForOrigins(
+      const std::set<GURL>& origins,
+      const GetCountsAndLastVisitForOriginsCallback& callback) const;
 
   // Returns, for the given URL, a 0-based index into the list produced by
   // TopHosts(), corresponding to that URL's host. If TopHosts() has not
   // previously been run, or the host is not in the top kMaxTopHosts, returns
   // kMaxTopHosts.
   //
   // Note: Virtual needed for mocking.
   virtual void HostRankIfAvailable(
       const GURL& url,
       const base::Callback<void(int)>& callback) const;
@@ skipping 657 matching lines @@
 
   // All vended weak pointers are invalidated in Cleanup().
   base::WeakPtrFactory<HistoryService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryService);
 };
 
 }  // namespace history
 
 #endif  // COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_H_