Refactor sending NOTIFICATION_HISTORY_URL_VISITED

components/history/core/browser/history_service_observer.h

 // Copyright 2014 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_OBSERVER_H_
 #define COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_OBSERVER_H_
 
 #include "base/macros.h"
 #include "components/history/core/browser/history_types.h"
 
 class HistoryService;
 
 namespace history {
 
 class HistoryServiceObserver {
  public:
   HistoryServiceObserver() {}
   virtual ~HistoryServiceObserver() {}
 
+  // Called when user visits an URL.
+  //
+  // The |row| ID will be set to the value that is currently in effect in the
+  // main history database. |redirects| is the list of redirects leading up to
+  // the URL. If we have a redirect chain A -> B -> C and user is visiting C,
+  // then |redirects[0]=B| and |redirects[1]=A|. If there are no redirects,
+  // |redirects| is an empty vector.
+  virtual void OnURLVisited(HistoryService* history_service,
+                            ui::PageTransition transition,
+                            const URLRow& row,
+                            const RedirectList& redirects,
+                            base::Time visit_time) {}
+
   // Called on changes to the VisitDatabase.
   virtual void OnAddVisit(HistoryService* history_service,
                           const BriefVisitInfo& info) {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(HistoryServiceObserver);
 };
 
 }  // namespace history
 
 #endif  // COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_OBSERVER_H_