Add PrerenderLocalPredictor, which will eventually perform

chrome/browser/history/visit_database.cc

 // 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.
 
 #include "chrome/browser/history/visit_database.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <set>
@@ skipping 540 matching lines @@
   if (!GetDB().DoesColumnExist("visits", "visit_duration")) {
     // Old versions don't have the visit_duration column, we modify the table
     // to add that field.
     if (!GetDB().Execute("ALTER TABLE visits "
         "ADD COLUMN visit_duration INTEGER DEFAULT 0 NOT NULL"))
       return false;
   }
   return true;
 }
 
+void VisitDatabase::GetBriefVisitInfoOfMostRecentVisits(
+    int max_visits,
+    std::vector<BriefVisitInfo>* result_vector) {
+  result_vector->clear();
+
+  sql::Statement statement(GetDB().GetUniqueStatement(
+      "SELECT url,visit_time,transition FROM visits "
+      "ORDER BY id DESC LIMIT ?"));
+
+  statement.BindInt64(0, max_visits);
+
+  if (!statement.is_valid())
+    return;
+
+  while (statement.Step()) {
+    BriefVisitInfo info;
+    info.url_id = statement.ColumnInt64(0);
+    info.time = base::Time::FromInternalValue(statement.ColumnInt64(1));
+    info.transition = content::PageTransitionFromInt(statement.ColumnInt(2));
+    result_vector->push_back(info);
+  }
+}
+
 }  // namespace history