Properly lock access to static variables....

base/metrics/histogram.h

 // Copyright (c) 2010 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 625 matching lines @@
 
 class StatisticsRecorder {
  public:
   typedef std::vector<scoped_refptr<Histogram> > Histograms;
 
   StatisticsRecorder();
 
   ~StatisticsRecorder();
 
   // Find out if histograms can now be registered into our list.
-  static bool WasStarted();
+  static bool IsActive();
 
   // Register, or add a new histogram to the collection of statistics.
   static void Register(Histogram* histogram);
 
   // 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);
 
@@ skipping 28 matching lines @@
 
   // Dump all known histograms to log.
   static bool dump_on_exit_;
 
   DISALLOW_COPY_AND_ASSIGN(StatisticsRecorder);
 };
 
 }  // namespace base
 
 #endif  // BASE_METRICS_HISTOGRAM_H_