Initial import.

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diff --git a/chromium/base/metrics/histogram_flattener.h b/chromium/base/metrics/histogram_flattener.h
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+++ b/chromium/base/metrics/histogram_flattener.h
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+// 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_FLATTENER_H_
+#define BASE_METRICS_HISTOGRAM_FLATTENER_H_
+
+#include <map>
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/metrics/histogram.h"
+
+namespace base {
+
+class HistogramSamples;
+
+// HistogramFlattener is an interface used by HistogramSnapshotManager, which
+// handles the logistics of gathering up available histograms for recording.
+// The implementors handle the exact lower level recording mechanism, or
+// error report mechanism.
+class BASE_EXPORT HistogramFlattener {
+ public:
+  virtual void RecordDelta(const HistogramBase& histogram,
+                           const HistogramSamples& snapshot) = 0;
+
+  // Will be called each time a type of Inconsistency is seen on a histogram,
+  // during inspections done internally in HistogramSnapshotManager class.
+  virtual void InconsistencyDetected(HistogramBase::Inconsistency problem) = 0;
+
+  // Will be called when a type of Inconsistency is seen for the first time on
+  // a histogram.
+  virtual void UniqueInconsistencyDetected(
+      HistogramBase::Inconsistency problem) = 0;
+
+  // Will be called when the total logged sample count of a histogram
+  // differs from the sum of logged sample count in all the buckets.  The
+  // argument |amount| is the non-zero discrepancy.
+  virtual void InconsistencyDetectedInLoggedCount(int amount) = 0;
+
+ protected:
+  HistogramFlattener() {}
+  virtual ~HistogramFlattener() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(HistogramFlattener);
+};
+
+}  // namespace base
+
+#endif  // BASE_METRICS_HISTOGRAM_FLATTENER_H_