Android systrace: Optimize memory dumps.

systrace/atrace_helper/jni/time_utils.h

+// Copyright 2017 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 TIME_UTILS_H_
+#define TIME_UTILS_H_
+
+#include <stdint.h>
+
+namespace time_utils {
+
+uint64_t GetTimestamp();
+
+class PeriodicTimer {
+ public:
+  PeriodicTimer(int interval_ms);
+  ~PeriodicTimer();
+
+  void Start();
+  void Stop();
+  // Wait for next tick. Returns false if interrupted by Stop() or not started.
+  bool Wait();
+
+ private:
+  PeriodicTimer(const PeriodicTimer&) = delete;
+  void operator=(const PeriodicTimer&) = delete;
+
+  const int interval_ms_;
+  int timer_fd_;
+};
+
+}  // namespace time_utils
+
+#endif  // TIME_UTILS_