Move StatisticsRecorder out of histogram.cc/h for further refactoring.

base/metrics/histogram.h

Index: base/metrics/histogram.h
===================================================================
--- base/metrics/histogram.h	(revision 143451)
+++ base/metrics/histogram.h	(working copy)
@@ -41,7 +41,6 @@
 #define BASE_METRICS_HISTOGRAM_H_
 #pragma once
 
-#include <list>
 #include <map>
 #include <string>
 #include <vector>
@@ -50,7 +49,6 @@
 #include "base/base_export.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
-#include "base/logging.h"
 #include "base/time.h"
 
 class Pickle;
@@ -775,90 +773,6 @@
   DISALLOW_COPY_AND_ASSIGN(CustomHistogram);
 };
 
-//------------------------------------------------------------------------------
-// StatisticsRecorder handles all histograms in the system.  It provides a
-// general place for histograms to register, and supports a global API for
-// accessing (i.e., dumping, or graphing) the data in all the histograms.
-
-class BASE_EXPORT StatisticsRecorder {
- public:
-  typedef std::vector<Histogram*> Histograms;
-
-  StatisticsRecorder();
-
-  ~StatisticsRecorder();
-
-  // Find out if histograms can now be registered into our list.
-  static bool IsActive();
-
-  // Register, or add a new histogram to the collection of statistics. If an
-  // identically named histogram is already registered, then the argument
-  // |histogram| will deleted.  The returned value is always the registered
-  // histogram (either the argument, or the pre-existing registered histogram).
-  static Histogram* RegisterOrDeleteDuplicate(Histogram* histogram);
-
-  // Register, or add a new cached_ranges_ of |histogram|. If an identical
-  // cached_ranges_ is already registered, then the cached_ranges_ of
-  // |histogram| is deleted and the |histogram|'s cached_ranges_ is reset to the
-  // registered cached_ranges_.  The cached_ranges_ of |histogram| is always the
-  // registered CachedRanges (either the argument's cached_ranges_, or the
-  // pre-existing registered cached_ranges_).
-  static void RegisterOrDeleteDuplicateRanges(Histogram* histogram);
-
-  // Method for collecting stats about histograms created in browser and
-  // renderer processes. |suffix| is appended to histogram names. |suffix| could
-  // be either browser or renderer.
-  static void CollectHistogramStats(const std::string& suffix);
-
-  // Methods for printing histograms.  Only histograms which have query as
-  // a substring are written to output (an empty string will process all
-  // registered histograms).
-  static void WriteHTMLGraph(const std::string& query, std::string* output);
-  static void WriteGraph(const std::string& query, std::string* output);
-
-  // Method for extracting histograms which were marked for use by UMA.
-  static void GetHistograms(Histograms* output);
-
-  // Find a histogram by name. It matches the exact name. This method is thread
-  // safe.  If a matching histogram is not found, then the |histogram| is
-  // not changed.
-  static bool FindHistogram(const std::string& query, Histogram** histogram);
-
-  static bool dump_on_exit() { return dump_on_exit_; }
-
-  static void set_dump_on_exit(bool enable) { dump_on_exit_ = enable; }
-
-  // GetSnapshot copies some of the pointers to registered histograms into the
-  // caller supplied vector (Histograms).  Only histograms with names matching
-  // query are returned. The query must be a substring of histogram name for its
-  // pointer to be copied.
-  static void GetSnapshot(const std::string& query, Histograms* snapshot);
-
-
- private:
-  // We keep all registered histograms in a map, from name to histogram.
-  typedef std::map<std::string, Histogram*> HistogramMap;
-
-  // We keep all |cached_ranges_| in a map, from checksum to a list of
-  // |cached_ranges_|.  Checksum is calculated from the |ranges_| in
-  // |cached_ranges_|.
-  typedef std::map<uint32, std::list<CachedRanges*>*> RangesMap;
-
-  static HistogramMap* histograms_;
-
-  static RangesMap* ranges_;
-
-  // lock protects access to the above map.
-  static base::Lock* lock_;
-
-  // Dump all known histograms to log.
-  static bool dump_on_exit_;
-
-  DISALLOW_COPY_AND_ASSIGN(StatisticsRecorder);
-};
-
-//------------------------------------------------------------------------------
-
 // CachedRanges stores the Ranges vector. Histograms that have same Ranges
 // vector will use the same CachedRanges object.
 class BASE_EXPORT CachedRanges {