Initialize StatisticsRecorder in Child Process to hold

base/metrics/statistics_recorder.cc

 // 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.
 
 #include "base/metrics/statistics_recorder.h"
 
 #include "base/debug/leak_annotations.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/stringprintf.h"
 #include "base/synchronization/lock.h"
 
+namespace {
+// Initialize histogram statistics gathering system.
+base::LazyInstance<base::StatisticsRecorder>::Leaky
+    g_statistics_recorder_ = LAZY_INSTANCE_INITIALIZER;
+}  // namespace
+
 namespace base {
 
 // Collect the number of histograms created.
 static uint32 number_of_histograms_ = 0;
 // Collect the number of vectors saved because of caching ranges.
 static uint32 number_of_vectors_saved_ = 0;
 // Collect the number of ranges_ elements saved because of caching ranges.
 static size_t saved_ranges_size_ = 0;
 
 // This singleton instance should be started during the single threaded portion
@@ skipping 37 matching lines @@
     ranges_ = NULL;
   }
   // We are going to leak the histograms and the ranges.
   delete histograms;
   delete ranges;
   // We don't delete lock_ on purpose to avoid having to properly protect
   // against it going away after we checked for NULL in the static methods.
 }
 
 // static
+void StatisticsRecorder::Initialize() {
+  // Ensure that an instance of the StatisticsRecorder object is created.
+  g_statistics_recorder_.Get();
+}
+
+
+// static
 bool StatisticsRecorder::IsActive() {
   if (lock_ == NULL)
     return false;
   base::AutoLock auto_lock(*lock_);
   return NULL != histograms_;
 }
 
 Histogram* StatisticsRecorder::RegisterOrDeleteDuplicate(Histogram* histogram) {
   // As per crbug.com/79322 the histograms are intentionally leaked, so we need
   // to annotate them. Because ANNOTATE_LEAKING_OBJECT_PTR may be used only once
@@ skipping 196 matching lines @@
 // static
 StatisticsRecorder::HistogramMap* StatisticsRecorder::histograms_ = NULL;
 // static
 StatisticsRecorder::RangesMap* StatisticsRecorder::ranges_ = NULL;
 // static
 base::Lock* StatisticsRecorder::lock_ = NULL;
 // static
 bool StatisticsRecorder::dump_on_exit_ = false;
 
 }  // namespace base