chrome/browser/metrics/time_ticks_experiment_win.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_METRICS_TIME_TICKS_EXPERIMENT_WIN_H_
   6 #define CHROME_BROWSER_METRICS_TIME_TICKS_EXPERIMENT_WIN_H_
   7
   8 #include "build/build_config.h"
   9
  10 #if defined(OS_WIN)
  11
  12 namespace chrome {
  13
  14 // Runs an experiment once per session upon successful upload of UMA. Determines
  15 // if QueryPerformanceCounter() is safe to use generally on this system. Ensures
  16 // that the resolution is better than 1ms, returns quickly, and is monotonically
  17 // increasing. Records the results in UMA for the next upload.
  18 void CollectTimeTicksStats();
  19
  20 }  // namespace chrome
  21
  22 #endif  // defined(OS_WIN)
  23
  24 #endif  // CHROME_BROWSER_METRICS_TIME_TICKS_EXPERIMENT_WIN_H_