Use string for Histogram names since these are all ASCII anyway wide-characte...

base/histogram.h

 // Copyright (c) 2006-2008 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).
 
 // It supports calls to accumulate either time intervals (which are processed
 // as integral number of milliseconds), or arbitrary integral units.
@@ skipping 200 matching lines @@
     // that fit into each bucket.
     Counts counts_;
 
     // Save simple stats locally.  Note that this MIGHT get done in base class
     // without shared memory at some point.
     int64 sum_;         // sum of samples.
     int64 square_sum_;  // sum of squares of samples.
   };
   //----------------------------------------------------------------------------
 
-  Histogram(const wchar_t* name, Sample minimum,
+  Histogram(const char* name, Sample minimum,
             Sample maximum, size_t bucket_count);
-  Histogram(const wchar_t* name, base::TimeDelta minimum,
+  Histogram(const char* name, base::TimeDelta minimum,
             base::TimeDelta maximum, size_t bucket_count);
   virtual ~Histogram();
 
   // Hooks to override stats counter methods.  This ensures that we gather all
   // input the stats counter sees.
   virtual void Add(int value);
 
   // The following methods provide graphical histogram displays.
   void WriteHTMLGraph(std::string* output) const;
   void WriteAscii(bool graph_it, const std::string& newline,
@@ skipping 116 matching lines @@
 //------------------------------------------------------------------------------
 
 // LinearHistogram is a more traditional histogram, with evenly spaced
 // buckets.
 class LinearHistogram : public Histogram {
  public:
   struct DescriptionPair {
     Sample sample;
     const char* description;  // Null means end of a list of pairs.
   };
-  LinearHistogram(const wchar_t* name, Sample minimum,
+  LinearHistogram(const char* name, Sample minimum,
             Sample maximum, size_t bucket_count);
-  LinearHistogram(const wchar_t* name, base::TimeDelta minimum,
+  LinearHistogram(const char* name, base::TimeDelta minimum,
             base::TimeDelta maximum, size_t bucket_count);
   ~LinearHistogram() {}
 
   // Store a list of number/text values for use in rendering the histogram.
   // The last element in the array has a null in its "description" slot.
   void SetRangeDescriptions(const DescriptionPair descriptions[]);
 
  protected:
   // Initialize ranges_ mapping.
   virtual void InitializeBucketRange();
@@ skipping 17 matching lines @@
   BucketDescriptionMap bucket_description_;
 
   DISALLOW_EVIL_CONSTRUCTORS(LinearHistogram);
 };
 
 //------------------------------------------------------------------------------
 
 // BooleanHistogram is a histogram for booleans.
 class BooleanHistogram : public LinearHistogram {
  public:
-  explicit BooleanHistogram(const wchar_t* name)
+  explicit BooleanHistogram(const char* name)
     : LinearHistogram(name, 0, 2, 3) {
   }
 
   virtual void AddBoolean(bool value) { Add(value ? 1 : 0); }
 
  private:
   DISALLOW_EVIL_CONSTRUCTORS(BooleanHistogram);
 };
 
 //------------------------------------------------------------------------------
 // This section provides implementation for ThreadSafeHistogram.
 //------------------------------------------------------------------------------
 
 class ThreadSafeHistogram : public Histogram {
  public:
-  ThreadSafeHistogram(const wchar_t* name, Sample minimum,
+  ThreadSafeHistogram(const char* name, Sample minimum,
                       Sample maximum, size_t bucket_count);
 
   // Provide the analog to Add()
   void Remove(int value);
 
  protected:
   // Provide locked versions to get precise counts.
   virtual void Accumulate(Sample value, Count count, size_t index);
 
   virtual void SnapshotSample(SampleSet* sample);
@@ skipping 51 matching lines @@
   // lock protects access to the above map.
   static Lock* lock_;
 
   // Dump all known histograms to log.
   static bool dump_on_exit_;
 
   DISALLOW_EVIL_CONSTRUCTORS(StatisticsRecorder);
 };
 
 #endif  // BASE_HISTOGRAM_H__
-