Add OVERRIDE to base/.

base/metrics/stats_counters.h

 // Copyright (c) 2011 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.
 
 #ifndef BASE_METRICS_STATS_COUNTERS_H_
 #define BASE_METRICS_STATS_COUNTERS_H_
 #pragma once
 
 #include <string>
 
 #include "base/base_export.h"
+#include "base/compiler_specific.h"
 #include "base/metrics/stats_table.h"
 #include "base/time.h"
 
 namespace base {
 
 // StatsCounters are dynamically created values which can be tracked in
 // the StatsTable.  They are designed to be lightweight to create and
 // easy to use.
 //
 // Since StatsCounters can be created dynamically by name, there is
@@ skipping 135 matching lines @@
 
 // A StatsRate is a timer that keeps a count of the number of intervals added so
 // that several statistics can be produced:
 //    min, max, avg, count, total
 class BASE_EXPORT StatsRate : public StatsCounterTimer {
  public:
   // Constructs and starts the timer.
   explicit StatsRate(const std::string& name);
   virtual ~StatsRate();
 
-  virtual void Add(int value);
+  virtual void Add(int value) OVERRIDE;
 
  private:
   StatsCounter counter_;
   StatsCounter largest_add_;
 };
 
 
 // Helper class for scoping a timer or rate.
 template<class T> class StatsScope {
  public:
@@ skipping 10 matching lines @@
     timer_.Stop();
   }
 
  private:
   T& timer_;
 };
 
 }  // namespace base
 
 #endif  // BASE_METRICS_STATS_COUNTERS_H_