histogram synchronizer code between renderer and browser for UMA and about_histogram

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 280 matching lines @@
   // accumulates the browser-side shadow copy of histograms (that mirror
   // histograms created in the renderer).
 
   // Serialize the given snapshot of a Histogram into a String. Uses
   // Pickle class to flatten the object.
   static std::string SerializeHistogramInfo(const Histogram& histogram,
                                             const SampleSet& snapshot);
   // The following method accepts a list of pickled histograms and
   // builds a histogram and updates shadow copy of histogram data in the
   // browser process.
-  static void DeserializeHistogramList(
-      const std::vector<std::string>& histograms);
-  static bool DeserializeHistogramInfo(const std::string& state);
+  static bool DeserializeHistogramInfo(const std::string& histogram_info);
 
 
   //----------------------------------------------------------------------------
   // Accessors for serialization and testing.
   //----------------------------------------------------------------------------
   const std::string histogram_name() const { return histogram_name_; }
   Sample declared_min() const { return declared_min_; }
   Sample declared_max() const { return declared_max_; }
   virtual Sample ranges(size_t i) const { return ranges_[i];}
   virtual size_t bucket_count() const { return bucket_count_; }
@@ skipping 235 matching lines @@
   // lock protects access to the above map.
   static Lock* lock_;
 
   // Dump all known histograms to log.
   static bool dump_on_exit_;
 
   DISALLOW_COPY_AND_ASSIGN(StatisticsRecorder);
 };
 
 #endif  // BASE_HISTOGRAM_H_