Revert of Show max latency on client's status bar

remoting/base/running_average.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 REMOTING_BASE_RUNNING_AVERAGE_H_
+#define REMOTING_BASE_RUNNING_AVERAGE_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <deque>
+
+#include "base/macros.h"
+#include "base/threading/thread_checker.h"
+
+namespace remoting {
+
+// Calculates the average of the most recent N recorded samples.
+// This is typically used to smooth out random variation in point samples
+// over bandwidth, frame rate, etc.
+class RunningAverage {
+ public:
+  // Constructs a helper to average over the |window_size| most recent samples.
+  explicit RunningAverage(int window_size);
+  virtual ~RunningAverage();
+
+  // Records a point sample.
+  void Record(int64_t value);
+
+  // Returns the average over up to |window_size| of the most recent samples.
+  double Average();
+
+ private:
+  // Stores the desired window size, as size_t to avoid casting when comparing
+  // with the size of |data_points_|.
+  const size_t window_size_;
+
+  // Stores the |window_size| most recently recorded samples.
+  std::deque<int64_t> data_points_;
+
+  // Holds the sum of the samples in |data_points_|.
+  int64_t sum_;
+
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(RunningAverage);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_BASE_RUNNING_AVERAGE_H_