chrome://profiler infrastructure uses base time types.

base/profiler/tracked_time.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/profiler/tracked_time.h"
-
-#include "build/build_config.h"
-
-#if defined(OS_WIN)
-#include <mmsystem.h>  // Declare timeGetTime()... after including build_config.
-#endif
-
-namespace tracked_objects {
-
-Duration::Duration() : ms_(0) {}
-Duration::Duration(int32_t duration) : ms_(duration) {}
-
-Duration& Duration::operator+=(const Duration& other) {
-  ms_ += other.ms_;
-  return *this;
-}
-
-Duration Duration::operator+(const Duration& other) const {
-  return Duration(ms_ + other.ms_);
-}
-
-bool Duration::operator==(const Duration& other) const {
-  return ms_ == other.ms_;
-}
-
-bool Duration::operator!=(const Duration& other) const {
-  return ms_ != other.ms_;
-}
-
-bool Duration::operator>(const Duration& other) const {
-  return ms_ > other.ms_;
-}
-
-// static
-Duration Duration::FromMilliseconds(int ms) { return Duration(ms); }
-
-int32_t Duration::InMilliseconds() const {
-  return ms_;
-}
-
-//------------------------------------------------------------------------------
-
-TrackedTime::TrackedTime() : ms_(0) {}
-TrackedTime::TrackedTime(int32_t ms) : ms_(ms) {}
-TrackedTime::TrackedTime(const base::TimeTicks& time)
-    : ms_(static_cast<int32_t>((time - base::TimeTicks()).InMilliseconds())) {}
-
-// static
-TrackedTime TrackedTime::Now() {
-  return TrackedTime(base::TimeTicks::Now());
-}
-
-Duration TrackedTime::operator-(const TrackedTime& other) const {
-  return Duration(ms_ - other.ms_);
-}
-
-TrackedTime TrackedTime::operator+(const Duration& other) const {
-  return TrackedTime(ms_ + other.ms_);
-}
-
-bool TrackedTime::is_null() const { return ms_ == 0; }
-
-}  // namespace tracked_objects