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

components/history/core/browser/history_service.cc

 // 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.
 
 // The history system runs on a background thread so that potentially slow
 // database operations don't delay the browser. This backend processing is
 // represented by HistoryBackend. The HistoryService's job is to dispatch to
 // that thread.
 //
 // Main thread                       History thread
@@ skipping 350 matching lines @@
 void HistoryService::TopHosts(size_t num_hosts,
                               const TopHostsCallback& callback) const {
   DCHECK(thread_) << "History service being called after cleanup";
   DCHECK(thread_checker_.CalledOnValidThread());
   PostTaskAndReplyWithResult(
       thread_->task_runner().get(), FROM_HERE,
       base::Bind(&HistoryBackend::TopHosts, history_backend_.get(), num_hosts),
       callback);
 }
 
-void HistoryService::GetCountsForOrigins(
+void HistoryService::GetCountsAndLastVisitForOrigins(
     const std::set<GURL>& origins,
-    const GetCountsForOriginsCallback& callback) const {
+    const GetCountsAndLastVisitForOriginsCallback& callback) const {
   DCHECK(thread_) << "History service being called after cleanup";
   DCHECK(thread_checker_.CalledOnValidThread());
-  PostTaskAndReplyWithResult(thread_->task_runner().get(), FROM_HERE,
-                             base::Bind(&HistoryBackend::GetCountsForOrigins,
-                                        history_backend_.get(), origins),
-                             callback);
+  PostTaskAndReplyWithResult(
+      thread_->task_runner().get(), FROM_HERE,
+      base::Bind(&HistoryBackend::GetCountsAndLastVisitForOrigins,
+                 history_backend_.get(), origins),
+      callback);
 }
 
 void HistoryService::HostRankIfAvailable(
     const GURL& url,
     const base::Callback<void(int)>& callback) const {
   DCHECK(thread_) << "History service being called after cleanup";
   DCHECK(thread_checker_.CalledOnValidThread());
   PostTaskAndReplyWithResult(thread_->task_runner().get(), FROM_HERE,
                              base::Bind(&HistoryBackend::HostRankIfAvailable,
                                         history_backend_.get(), url),
@@ skipping 774 matching lines @@
   return favicon_changed_callback_list_.Add(callback);
 }
 
 void HistoryService::NotifyFaviconsChanged(const std::set<GURL>& page_urls,
                                            const GURL& icon_url) {
   DCHECK(thread_checker_.CalledOnValidThread());
   favicon_changed_callback_list_.Notify(page_urls, icon_url);
 }
 
 }  // namespace history