Connect SparseHistogram with the rest of stats system

net/disk_cache/stats_histogram.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 "net/disk_cache/stats_histogram.h"
 
 #include "base/debug/leak_annotations.h"
 #include "base/logging.h"
 #include "base/metrics/bucket_ranges.h"
 #include "base/metrics/histogram_base.h"
@@ skipping 27 matching lines @@
     ranges->set_range(i, stats->GetBucketRange(i));
   }
   ranges->ResetChecksum();
 }
 
 StatsHistogram* StatsHistogram::FactoryGet(const std::string& name,
                                            const Stats* stats) {
   Sample minimum = 1;
   Sample maximum = disk_cache::Stats::kDataSizesLength - 1;
   size_t bucket_count = disk_cache::Stats::kDataSizesLength;
-  Histogram* histogram = StatisticsRecorder::FindHistogram(name);
+  HistogramBase* histogram = StatisticsRecorder::FindHistogram(name);
   if (!histogram) {
     DCHECK(stats);
 
     // To avoid racy destruction at shutdown, the following will be leaked.
     BucketRanges* ranges = new BucketRanges(bucket_count + 1);
     InitializeBucketRanges(stats, ranges);
     const BucketRanges* registered_ranges =
         StatisticsRecorder::RegisterOrDeleteDuplicateRanges(ranges);
 
     // To avoid racy destruction at shutdown, the following will be leaked.
@@ skipping 17 matching lines @@
   scoped_ptr<SampleVector> samples(new SampleVector(bucket_ranges()));
   stats_->Snapshot(samples.get());
 
   // Only report UMA data once.
   StatsHistogram* mutable_me = const_cast<StatsHistogram*>(this);
   mutable_me->ClearFlags(kUmaTargetedHistogramFlag);
 
   return samples.PassAs<HistogramSamples>();
 }
 
-Histogram::Inconsistencies StatsHistogram::FindCorruption(
-    const HistogramSamples& samples) const {
-  return NO_INCONSISTENCIES;  // This class won't monitor inconsistencies.
+int StatsHistogram::FindCorruption(const HistogramSamples& samples) const {
+  // This class won't monitor inconsistencies.
+  return HistogramBase::NO_INCONSISTENCIES;
 }
 
 }  // namespace disk_cache