1 // Copyright 2018 The Chromium Authors 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 COMPONENTS_METRICS_EXPIRED_HISTOGRAM_UTIL_H_ 6 #define COMPONENTS_METRICS_EXPIRED_HISTOGRAM_UTIL_H_ 7 8 #include <stddef.h> 9 #include <stdint.h> 10 11 #include "base/containers/span.h" 12 13 namespace metrics { 14 15 // Enables histogram expiry checker if it is enabled by field trial. Histogram 16 // expiry is disbaled by default so that unit tests don't fail unexpectedly when 17 // a histogram expires. 18 void EnableExpiryChecker(base::span<const uint32_t> expired_histograms_hashes); 19 20 } // namespace metrics 21 22 #endif // COMPONENTS_METRICS_EXPIRED_HISTOGRAM_UTIL_H_ 23