Add PrerenderLocalPredictor, which will eventually perform

chrome/browser/history/visit_database.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_VISIT_DATABASE_H_
 #define CHROME_BROWSER_HISTORY_VISIT_DATABASE_H_
 #pragma once
 
 #include "chrome/browser/history/history_types.h"
 
@@ skipping 154 matching lines @@
                                   int* count,
                                   base::Time* first_visit);
 
   // Get the time of the first item in our database.
   bool GetStartDate(base::Time* first_visit);
 
   // Get the source information about the given visits.
   void GetVisitsSource(const VisitVector& visits,
                        VisitSourceMap* sources);
 
+  // Obtains BriefVisitInfo for the specified number of most recent visits
+  // from the visit database.
+  void GetBriefVisitInfoOfMostRecentVisits(
+      int max_visits,
+      std::vector<BriefVisitInfo>* result_vector);
+
  protected:
   // Returns the database for the functions in this interface.
   virtual sql::Connection& GetDB() = 0;
 
   // Called by the derived classes on initialization to make sure the tables
   // and indices are properly set up. Must be called before anything else.
   bool InitVisitTable();
 
   // Convenience to fill a VisitRow. Assumes the visit values are bound starting
   // at index 0.
   static void FillVisitRow(sql::Statement& statement, VisitRow* visit);
 
   // Convenience to fill a VisitVector. Assumes that statement.step()
   // hasn't happened yet.
   static bool FillVisitVector(sql::Statement& statement, VisitVector* visits);
 
   // Called by the derived classes to migrate the older visits table which
   // don't have visit_duration column yet.
   bool MigrateVisitsWithoutDuration();
 
  private:
 
   DISALLOW_COPY_AND_ASSIGN(VisitDatabase);
 };
 
 }  // history
 
 #endif  // CHROME_BROWSER_HISTORY_VISIT_DATABASE_H_