Index: base/metrics/histogram.h |
diff --git a/base/metrics/histogram.h b/base/metrics/histogram.h |
index d4d009c6ae01c1fa246c5e3a364969899a39aa4d..2283a4d80fd142bbc3b701b9d996af04c48d3128 100644 |
--- a/base/metrics/histogram.h |
+++ b/base/metrics/histogram.h |
@@ -204,6 +204,7 @@ class BASE_EXPORT Histogram : public HistogramBase { |
void AddCount(Sample value, int count) override; |
std::unique_ptr<HistogramSamples> SnapshotSamples() const override; |
std::unique_ptr<HistogramSamples> SnapshotDelta() override; |
+ std::unique_ptr<HistogramSamples> SnapshotFinalDelta() const override; |
void AddSamples(const HistogramSamples& samples) override; |
bool AddSamplesFromPickle(base::PickleIterator* iter) override; |
void WriteHTMLGraph(std::string* output) const override; |
@@ -313,6 +314,10 @@ class BASE_EXPORT Histogram : public HistogramBase { |
// Also keep a previous uploaded state for calculating deltas. |
std::unique_ptr<HistogramSamples> logged_samples_; |
+ // Flag to indicate if PrepareFinalDelta has been previously called. It is |
+ // used to DCHECK that a final delta is not created multiple times. |
+ mutable bool final_delta_created_ = false; |
+ |
DISALLOW_COPY_AND_ASSIGN(Histogram); |
}; |