SparseHistogram    36 base/metrics/sparse_histogram.cc SparseHistogram::~SparseHistogram() {}
SparseHistogram    87 base/metrics/sparse_histogram.cc SparseHistogram::SparseHistogram(const string& name)
SparseHistogram    60 chrome/browser/extensions/api/metrics_private/metrics_apitest.cc struct SparseHistogram {