Index: base/metrics/sparse_histogram.h |
diff --git a/base/metrics/sparse_histogram.h b/base/metrics/sparse_histogram.h |
index f0296cbb1e1b1a2988020339df236943dc5b6986..d49ca99dcc211741e44205093fda48fbc0f2868f 100644 |
--- a/base/metrics/sparse_histogram.h |
+++ b/base/metrics/sparse_histogram.h |
@@ -80,6 +80,7 @@ class BASE_EXPORT SparseHistogram : public HistogramBase { |
bool AddSamplesFromPickle(base::PickleIterator* iter) override; |
std::unique_ptr<HistogramSamples> SnapshotSamples() const override; |
std::unique_ptr<HistogramSamples> SnapshotDelta() override; |
+ std::unique_ptr<HistogramSamples> SnapshotDifference() const override; |
void WriteHTMLGraph(std::string* output) const override; |
void WriteAscii(std::string* output) const override; |