Index: base/metrics/histogram_snapshot_manager.cc |
diff --git a/base/metrics/histogram_snapshot_manager.cc b/base/metrics/histogram_snapshot_manager.cc |
index a774ea6177c7da8ad8c95c9faded69c185502424..ae7f6b158fa5d32843dd2a9333b4ae831a448d6c 100644 |
--- a/base/metrics/histogram_snapshot_manager.cc |
+++ b/base/metrics/histogram_snapshot_manager.cc |
@@ -35,6 +35,7 @@ void HistogramSnapshotManager::PrepareFinalDelta( |
void HistogramSnapshotManager::PrepareSamples( |
const HistogramBase* histogram, |
std::unique_ptr<HistogramSamples> samples) { |
+ DCHECK(thread_checker_.CalledOnValidThread()); |
DCHECK(histogram_flattener_); |
// Get information known about this histogram. If it did not previously |