Embed a single sample in histogram metadata.

base/metrics/histogram_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/metrics/histogram.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 472 matching lines @@
   // Add some samples.
   histogram->Add(20);
   histogram->Add(40);
 
   std::unique_ptr<SampleVector> snapshot = histogram->SnapshotSampleVector();
   EXPECT_EQ(HistogramBase::NO_INCONSISTENCIES,
             histogram->FindCorruption(*snapshot));
   EXPECT_EQ(2, snapshot->redundant_count());
   EXPECT_EQ(2, snapshot->TotalCount());
 
-  snapshot->counts_[3] += 100;  // Sample count won't match redundant count.
+  snapshot->counts()[3] += 100;  // Sample count won't match redundant count.
   EXPECT_EQ(HistogramBase::COUNT_LOW_ERROR,
             histogram->FindCorruption(*snapshot));
-  snapshot->counts_[2] -= 200;
+  snapshot->counts()[2] -= 200;
   EXPECT_EQ(HistogramBase::COUNT_HIGH_ERROR,
             histogram->FindCorruption(*snapshot));
 
   // But we can't spot a corruption if it is compensated for.
-  snapshot->counts_[1] += 100;
+  snapshot->counts()[1] += 100;
   EXPECT_EQ(HistogramBase::NO_INCONSISTENCIES,
             histogram->FindCorruption(*snapshot));
 }
 
 TEST_P(HistogramTest, CorruptBucketBounds) {
   Histogram* histogram = static_cast<Histogram*>(
       Histogram::FactoryGet("Histogram", 1, 64, 8, HistogramBase::kNoFlags));
 
   std::unique_ptr<HistogramSamples> snapshot = histogram->SnapshotSamples();
   EXPECT_EQ(HistogramBase::NO_INCONSISTENCIES,
@@ skipping 231 matching lines @@
   // CustomHistogram needs at least 1 valid range.
   custom_ranges.clear();
   custom_ranges.push_back(0);
   EXPECT_DEATH_IF_SUPPORTED(
       CustomHistogram::FactoryGet("BadRangesCustom3", custom_ranges,
                                   HistogramBase::kNoFlags),
                "");
 }
 
 }  // namespace base