1 // Copyright 2014 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 // This file defines an utility function that records any changes in a given 6 // histogram for transmission. 7 8 #ifndef COMPONENTS_METRICS_HISTOGRAM_ENCODER_H_ 9 #define COMPONENTS_METRICS_HISTOGRAM_ENCODER_H_ 10 11 #include <string> 12 13 #include "third_party/metrics_proto/chrome_user_metrics_extension.pb.h" 14 15 namespace base { 16 class HistogramSamples; 17 } 18 19 namespace metrics { 20 21 // Record any changes (histogram deltas of counts from |snapshot|) into 22 // |uma_proto| for the given histogram (|histogram_name|). 23 void EncodeHistogramDelta(const std::string& histogram_name, 24 const base::HistogramSamples& snapshot, 25 ChromeUserMetricsExtension* uma_proto); 26 27 } // namespace metrics 28 29 #endif // COMPONENTS_METRICS_HISTOGRAM_ENCODER_H_ 30