Connect SparseHistogram with the rest of stats system

chrome/common/startup_metric_utils.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 "chrome/common/startup_metric_utils.h"
 
 #include "base/hash_tables.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/histogram_base.h"
@@ skipping 95 matching lines @@
     return;
   DCHECK(!g_startup_stats_collection_finished);
 
   const base::TimeDelta kStartupTimeMin(
       base::TimeDelta::FromMilliseconds(1));
   const base::TimeDelta kStartupTimeMax(base::TimeDelta::FromMinutes(5));
   static const size_t kStartupTimeBuckets = 100;
 
   // Set UMA flag for histograms outside chrome/ that can't use the
   // ScopedSlowStartupUMA class.
-  base::Histogram* histogram =
+  base::HistogramBase* histogram =
       base::StatisticsRecorder::FindHistogram("Startup.SlowStartupNSSInit");
   if (histogram)
     histogram->SetFlags(base::HistogramBase::kUmaTargetedHistogramFlag);
 
   // Iterate over the stats recorded by ScopedSlowStartupUMA and create
   // histograms for them.
   base::AutoLock locker(*GetSubsystemStartupTimeHashLock());
   SubsystemStartupTimeHash* time_hash = GetSubsystemStartupTimeHash();
   for (SubsystemStartupTimeHash::iterator i = time_hash->begin();
       i != time_hash->end();
@@ skipping 19 matching lines @@
   SubsystemStartupTimeHash* hash = GetSubsystemStartupTimeHash();
   // Only record the initial sample for a given histogram.
   if (hash->find(histogram_name_) !=  hash->end())
     return;
 
   (*hash)[histogram_name_] =
       base::TimeTicks::Now() - start_time_;
 }
 
 }  // namespace startup_metric_utils