Add PrerenderLocalPredictor, which will eventually perform

chrome/browser/history/history_backend.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 CHROME_BROWSER_HISTORY_HISTORY_BACKEND_H_
 #define CHROME_BROWSER_HISTORY_HISTORY_BACKEND_H_
 #pragma once
 
 #include <string>
 #include <utility>
@@ skipping 73 matching lines @@
     //
     // Ownership of the HistoryDetails is transferred to this function.
     virtual void BroadcastNotifications(int type,
                                         HistoryDetails* details) = 0;
 
     // Invoked when the backend has finished loading the db.
     virtual void DBLoaded(int backend_id) = 0;
 
     // Tell TopSites to start reading thumbnails from the ThumbnailsDB.
     virtual void StartTopSitesMigration(int backend_id) = 0;
+
+    virtual void NotifyVisitDBObserversOnAddVisit(
+        history::BriefVisitInfo info) = 0;
   };
 
   // Init must be called to complete object creation. This object can be
   // constructed on any thread, but all other functions including Init() must
   // be called on the history thread.
   //
   // |history_dir| is the directory where the history files will be placed.
   // See the definition of BroadcastNotificationsCallback above. This function
   // takes ownership of the callback pointer.
   //
@@ skipping 477 matching lines @@
   // If there is a favicon for |page_url| and one of the types in |icon_types|,
   // |favicon| is set appropriately and true is returned.
   bool GetFaviconFromDB(const GURL& page_url,
                         int icon_types,
                         FaviconData* favicon);
 
   // Get favicon by the given |favicon_id|, the |favicon| is set appropriately
   // and true if returned on success, otherwise false is returned.
   bool GetFaviconFromDB(FaviconID favicon_id, FaviconData* favicon);
 
+  // Notify any observers of an addition to the visit database.
+  void NotifyVisitObservers(VisitRow* visit);

[brettw, 2012/04/20 22:21:50]

Can't you pass this by const ref?

[tburkard, 2012/04/20 22:56:44]

Done.

+
   // Data ----------------------------------------------------------------------
 
   // Delegate. See the class definition above for more information. This will
   // be NULL before Init is called and after Cleanup, but is guaranteed
   // non-NULL in between.
   scoped_ptr<Delegate> delegate_;
 
   // The id of this class, given in creation and used for identifying the
   // backend when calling the delegate.
   int id_;
@@ skipping 77 matching lines @@
   // Publishes the history to all indexers which are registered to receive
   // history data from us. Can be NULL if there are no listeners.
   scoped_ptr<HistoryPublisher> history_publisher_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryBackend);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_BACKEND_H_