Port flush_cache tool.

chrome/browser/visitedlink_perftest.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 <string>
 #include <vector>
 
+#include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/perftimer.h"
 #include "base/shared_memory.h"
 #include "base/string_util.h"
 #include "base/test_file_util.h"
 #include "chrome/browser/visitedlink_master.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::TimeDelta;
 
@@ skipping 117 matching lines @@
   }
 
   // test loading the DB back, we do this several times since the flushing is
   // not very reliable.
   const int load_count = 5;
   std::vector<double> cold_load_times;
   std::vector<double> hot_load_times;
   for (int i = 0; i < load_count; i++)
   {
     // make sure the file has to be re-loaded
-    file_util::EvictFileFromSystemCache(db_name_.c_str());
+    file_util::EvictFileFromSystemCache(
+        FilePath::FromWStringHack(std::wstring(db_name_)));
 
     // cold load (no OS cache, hopefully)
     {
       PerfTimer cold_timer;
 
       VisitedLinkMaster master(NULL, DummyBroadcastNewTableEvent, NULL, true,
                                db_name_, 0);
       bool success = master.Init();
       TimeDelta elapsed = cold_timer.Elapsed();
       ASSERT_TRUE(success);
@@ skipping 25 matching lines @@
   for (int i = 0; i < static_cast<int>(cold_load_times.size()); i++) {
     cold_sum += cold_load_times[i];
     hot_sum += hot_load_times[i];
   }
   LogPerfResult("Visited_link_cold_load_time",
                 cold_sum / cold_load_times.size(), "ms");
   LogPerfResult("Visited_link_hot_load_time",
                 hot_sum / hot_load_times.size(), "ms");
 }