Add more code for debugging. We will revert this change when we find out the reason of corruption.

base/metrics/bucket_ranges.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/bucket_ranges.h"
 
 #include <cmath>
 
 #include "base/logging.h"
 
@@ skipping 85 matching lines @@
 }
 
 BucketRanges::BucketRanges(size_t num_ranges)
     : ranges_(num_ranges, 0),
       checksum_(0) {}
 
 BucketRanges::~BucketRanges() {}
 
 void BucketRanges::set_range(size_t i, HistogramBase::Sample value) {
   DCHECK_LT(i, ranges_.size());
-  DCHECK_GE(value, 0);
+  CHECK_GE(value, 0);
   ranges_[i] = value;
 }
 
 uint32 BucketRanges::CalculateChecksum() const {
   // Seed checksum.
   uint32 checksum = static_cast<uint32>(ranges_.size());
 
   for (size_t index = 0; index < ranges_.size(); ++index)
     checksum = Crc32(checksum, ranges_[index]);
   return checksum;
@@ skipping 13 matching lines @@
   if (ranges_.size() != other->ranges_.size())
     return false;
   for (size_t index = 0; index < ranges_.size(); ++index) {
     if (ranges_[index] != other->ranges_[index])
       return false;
   }
   return true;
 }
 
 }  // namespace base