Move base to DEPS

base/metrics/histogram_samples.h

-// 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.
-
-#ifndef BASE_METRICS_HISTOGRAM_SAMPLES_H_
-#define BASE_METRICS_HISTOGRAM_SAMPLES_H_
-
-#include "base/basictypes.h"
-#include "base/metrics/histogram_base.h"
-#include "base/memory/scoped_ptr.h"
-
-namespace base {
-
-class Pickle;
-class PickleIterator;
-class SampleCountIterator;
-
-// HistogramSamples is a container storing all samples of a histogram.
-class BASE_EXPORT HistogramSamples {
- public:
-  HistogramSamples();
-  virtual ~HistogramSamples();
-
-  virtual void Accumulate(HistogramBase::Sample value,
-                          HistogramBase::Count count) = 0;
-  virtual HistogramBase::Count GetCount(HistogramBase::Sample value) const = 0;
-  virtual HistogramBase::Count TotalCount() const = 0;
-
-  virtual void Add(const HistogramSamples& other);
-
-  // Add from serialized samples.
-  virtual bool AddFromPickle(PickleIterator* iter);
-
-  virtual void Subtract(const HistogramSamples& other);
-
-  virtual scoped_ptr<SampleCountIterator> Iterator() const = 0;
-  virtual bool Serialize(Pickle* pickle) const;
-
-  // Accessor fuctions.
-  int64 sum() const { return sum_; }
-  HistogramBase::Count redundant_count() const {
-    return subtle::NoBarrier_Load(&redundant_count_);
-  }
-
- protected:
-  // Based on |op| type, add or subtract sample counts data from the iterator.
-  enum Operator { ADD, SUBTRACT };
-  virtual bool AddSubtractImpl(SampleCountIterator* iter, Operator op) = 0;
-
-  void IncreaseSum(int64 diff);
-  void IncreaseRedundantCount(HistogramBase::Count diff);
-
- private:
-  int64 sum_;
-
-  // |redundant_count_| helps identify memory corruption. It redundantly stores
-  // the total number of samples accumulated in the histogram. We can compare
-  // this count to the sum of the counts (TotalCount() function), and detect
-  // problems. Note, depending on the implementation of different histogram
-  // types, there might be races during histogram accumulation and snapshotting
-  // that we choose to accept. In this case, the tallies might mismatch even
-  // when no memory corruption has happened.
-  HistogramBase::AtomicCount redundant_count_;
-};
-
-class BASE_EXPORT SampleCountIterator {
- public:
-  virtual ~SampleCountIterator();
-
-  virtual bool Done() const = 0;
-  virtual void Next() = 0;
-
-  // Get the sample and count at current position.
-  // |min| |max| and |count| can be NULL if the value is not of interest.
-  // Requires: !Done();
-  virtual void Get(HistogramBase::Sample* min,
-                   HistogramBase::Sample* max,
-                   HistogramBase::Count* count) const = 0;
-
-  // Get the index of current histogram bucket.
-  // For histograms that don't use predefined buckets, it returns false.
-  // Requires: !Done();
-  virtual bool GetBucketIndex(size_t* index) const;
-};
-
-}  // namespace base
-
-#endif  // BASE_METRICS_HISTOGRAM_SAMPLES_H_