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

chrome/browser/history/visit_database.cc

 // 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.
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <set>
 
 #include "chrome/browser/history/visit_database.h"
@@ skipping 350 matching lines @@
     // We've never been to this page before.
     *count = 0;
     return true;
   }
 
   *first_visit = Time::FromInternalValue(statement->column_int64(0));
   *count = statement->column_int(1);
   return true;
 }
 
+bool VisitDatabase::GetStartDate(Time* first_visit) {
+  SQLITE_UNIQUE_STATEMENT(statement, GetStatementCache(),
+      "SELECT MIN(visit_time) FROM visits WHERE visit_time != 0");
+  if (!statement.is_valid() || statement->step() != SQLITE_ROW || 
+      statement->column_int64(0) == 0) {
+    *first_visit = Time::Now();
+    return false;
+  }
+  *first_visit = Time::FromInternalValue(statement->column_int64(0));
+  return true;
+}
+
 }  // namespace history