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| 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_ |
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