Switch to the new CustomHistogram::ArrayToCustomRanges() utility

base/metrics/histogram.cc

 // Copyright (c) 2011 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.
 
 // Histogram is an object that aggregates statistics, and can summarize them in
 // various forms, including ASCII graphical, HTML, and numerically (as a
 // vector of numbers corresponding to each of the aggregating buckets).
 // See header file for details and examples.
 
 #include "base/metrics/histogram.h"
@@ skipping 507 matching lines @@
 }
 
 // Update histogram data with new sample.
 void Histogram::Accumulate(Sample value, Count count, size_t index) {
   // Note locking not done in this version!!!
   sample_.Accumulate(value, count, index);
 }
 
 void Histogram::SetBucketRange(size_t i, Sample value) {
   DCHECK_GT(bucket_count_, i);
+  DCHECK_GE(value, 0);
   ranges_[i] = value;
 }
 
 bool Histogram::ValidateBucketRanges() const {
   // Standard assertions that all bucket ranges should satisfy.
   DCHECK_EQ(bucket_count_ + 1, ranges_.size());
   DCHECK_EQ(0, ranges_[0]);
   DCHECK_EQ(declared_min(), ranges_[1]);
   DCHECK_EQ(declared_max(), ranges_[bucket_count_ - 1]);
   DCHECK_EQ(kSampleType_MAX, ranges_[bucket_count_]);
@@ skipping 604 matching lines @@
 }
 
 // static
 StatisticsRecorder::HistogramMap* StatisticsRecorder::histograms_ = NULL;
 // static
 base::Lock* StatisticsRecorder::lock_ = NULL;
 // static
 bool StatisticsRecorder::dump_on_exit_ = false;
 
 }  // namespace base