Connect SparseHistogram with the rest of stats system

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/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
@@ skipping 27 matching lines @@
 
 // static
 bool StatisticsRecorder::IsActive() {
   if (lock_ == NULL)
     return false;
   base::AutoLock auto_lock(*lock_);
   return NULL != histograms_;
 }
 
 // static
-Histogram* StatisticsRecorder::RegisterOrDeleteDuplicate(Histogram* histogram) {
+HistogramBase* StatisticsRecorder::RegisterOrDeleteDuplicate(
+    HistogramBase* 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
   // for an object, the duplicates should not be annotated.
   // Callers are responsible for not calling RegisterOrDeleteDuplicate(ptr)
   // twice if (lock_ == NULL) || (!histograms_).
   if (lock_ == NULL) {
     ANNOTATE_LEAKING_OBJECT_PTR(histogram);  // see crbug.com/79322
     return histogram;
   }
 
-  Histogram* histogram_to_delete = NULL;
-  Histogram* histogram_to_return = NULL;
+  HistogramBase* histogram_to_delete = NULL;
+  HistogramBase* histogram_to_return = NULL;
   {
     base::AutoLock auto_lock(*lock_);
     if (histograms_ == NULL) {
       histogram_to_return = histogram;
     } else {
       const string& name = histogram->histogram_name();
       HistogramMap::iterator it = histograms_->find(name);
       if (histograms_->end() == it) {
         (*histograms_)[name] = histogram;
         ANNOTATE_LEAKING_OBJECT_PTR(histogram);  // see crbug.com/79322
@@ skipping 176 matching lines @@
     list<const BucketRanges*>::iterator ranges_list_it;
     for (ranges_list_it = ranges_list->begin();
          ranges_list_it != ranges_list->end();
          ++ranges_list_it) {
       output->push_back(*ranges_list_it);
     }
   }
 }
 
 // static
-Histogram* StatisticsRecorder::FindHistogram(const std::string& name) {
+HistogramBase* StatisticsRecorder::FindHistogram(const std::string& name) {
   if (lock_ == NULL)
     return NULL;
   base::AutoLock auto_lock(*lock_);
   if (histograms_ == NULL)
     return NULL;
 
   HistogramMap::iterator it = histograms_->find(name);
   if (histograms_->end() == it)
     return NULL;
   return it->second;
@@ skipping 62 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