SampleSet -> HistogramSamples (will be reused by SparseHistogram)

base/metrics/histogram_flattener.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_FLATTENER_H_
 #define BASE_METRICS_HISTOGRAM_FLATTENER_H_
 
 #include <map>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.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 base::Histogram& histogram,
-                           const base::Histogram::SampleSet& snapshot) = 0;
+  virtual void RecordDelta(const Histogram& histogram,
+                           const HistogramSamples& snapshot) = 0;
 
   // Will be called each time a type of Inconsistenies is seen on a histogram,
   // during inspections done internally in HistogramSnapshotManager class.
   virtual void InconsistencyDetected(Histogram::Inconsistencies problem) = 0;
 
   // Will be called when a type of Inconsistenies is seen for the first time
   // on a histogram.
   virtual void UniqueInconsistencyDetected(
       Histogram::Inconsistencies 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_