Database usage adjustment for .../history

chrome/browser/history/top_sites_database.h

 // Copyright (c) 2011 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_TOP_SITES_DATABASE_H_
 #define CHROME_BROWSER_HISTORY_TOP_SITES_DATABASE_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 66 matching lines @@
 
   // Adds a new URL to the database.
   void AddPageThumbnail(const MostVisitedURL& url,
                         int new_rank,
                         const Images& thumbnail);
 
   // Sets the page rank. Should be called within an open transaction.
   void UpdatePageRankNoTransaction(const MostVisitedURL& url, int new_rank);
 
   // Updates thumbnail of a URL that's already in the database.
-  void UpdatePageThumbnail(const MostVisitedURL& url,
+  // Returns true if the database query succeeds.
+  bool UpdatePageThumbnail(const MostVisitedURL& url,
                            const Images& thumbnail);
 
   // Returns the URL's current rank or -1 if it is not present.
   int GetURLRank(const MostVisitedURL& url);
 
   // Returns the number of URLs (rows) in the database.
   int GetRowCount();
 
   sql::Connection* CreateDB(const FilePath& db_name);
 
   // Encodes redirects into a string.
   static std::string GetRedirects(const MostVisitedURL& url);
 
   // Decodes redirects from a string and sets them for the url.
   static void SetRedirects(const std::string& redirects, MostVisitedURL* url);
 
   scoped_ptr<sql::Connection> db_;
   sql::MetaTable meta_table_;
 
   // See description above class.
   bool may_need_history_migration_;
 
   DISALLOW_COPY_AND_ASSIGN(TopSitesDatabase);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_TOP_SITES_DATABASE_H_