Stop history search going on beyond the start of history....

chrome/browser/history/visit_database.h

 // Copyright (c) 2006-2008 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__
 
 #include "chrome/browser/history/history_types.h"
 
 struct sqlite3;
@@ skipping 101 matching lines @@
                             GURL* to_url);
 
   // Returns the number of visits to all urls on the scheme/host/post
   // identified by url. This is only valid for http and https urls (all other
   // schemes are ignored and false is returned).
   // count is set to the number of visits, first_visit is set to the first time
   // the host was visited. Returns true on success.
   bool GetVisitCountToHost(const GURL& url, int* count,
                            base::Time* first_visit);
 
+  // Get the time of the first item in our database.
+  bool GetStartDate(base::Time* first_visit);
+
  protected:
   // Returns the database and statement cache for the functions in this
   // interface. The decendent of this class implements these functions to
   // return its objects.
   virtual sqlite3* GetDB() = 0;
   virtual SqliteStatementCache& GetStatementCache() = 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(SQLStatement& statement, VisitRow* visit);
 
   // Convenience to fill a VisitVector. Assumes that statement.step()
   // hasn't happened yet.
   static void FillVisitVector(SQLStatement& statement, VisitVector* visits);
 
  private:
   DISALLOW_EVIL_CONSTRUCTORS(VisitDatabase);
 };
 
 }  // history
 
 #endif  // CHROME_BROWSER_HISTORY_VISIT_DATABASE_H__