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440   HistogramBase* existing = GetOrCreateStatisticsRecorderHistogram(histogram);
441   if (!existing) {
452   existing->AddSamples(*histogram->SnapshotDelta());
459   HistogramBase* existing = GetOrCreateStatisticsRecorderHistogram(histogram);
460   if (!existing) {
468   existing->AddSamples(*histogram->SnapshotFinalDelta());
660   HistogramBase* existing =
662   if (existing)
663     return existing;
674   existing = DeserializeHistogramInfo(&iter);
675   if (!existing)
679   DCHECK_EQ(0, existing->flags() & HistogramBase::kIPCSerializationSourceFlag);
681   return StatisticsRecorder::RegisterOrDeleteDuplicate(existing);
813   size_t existing = StatisticsRecorder::GetHistogramCount();
815   DVLOG_IF(1, existing)
816       << existing << " histograms were created before persistence was enabled.";