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diff --git a/media/libjxl/src/lib/extras/time.cc b/media/libjxl/src/lib/extras/time.cc
new file mode 100644
index 0000000000..73d1b8f260
--- /dev/null
+++ b/media/libjxl/src/lib/extras/time.cc
@@ -0,0 +1,60 @@
+// Copyright (c) the JPEG XL Project 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 "lib/extras/time.h"
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <ctime>
+
+#include "lib/jxl/base/os_macros.h"  // for JXL_OS_*
+
+#if JXL_OS_WIN
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif  // NOMINMAX
+#include <windows.h>
+#endif  // JXL_OS_WIN
+
+#if JXL_OS_MAC
+#include <mach/mach.h>
+#include <mach/mach_time.h>
+#endif  // JXL_OS_MAC
+
+#if JXL_OS_HAIKU
+#include <OS.h>
+#endif  // JXL_OS_HAIKU
+
+namespace jxl {
+
+double Now() {
+#if JXL_OS_WIN
+  LARGE_INTEGER counter;
+  (void)QueryPerformanceCounter(&counter);
+  LARGE_INTEGER freq;
+  (void)QueryPerformanceFrequency(&freq);
+  return double(counter.QuadPart) / freq.QuadPart;
+#elif JXL_OS_MAC
+  const auto t = mach_absolute_time();
+  // On OSX/iOS platform the elapsed time is cpu time unit
+  // We have to query the time base information to convert it back
+  // See https://developer.apple.com/library/mac/qa/qa1398/_index.html
+  static mach_timebase_info_data_t timebase;
+  if (timebase.denom == 0) {
+    (void)mach_timebase_info(&timebase);
+  }
+  return double(t) * timebase.numer / timebase.denom * 1E-9;
+#elif JXL_OS_HAIKU
+  return double(system_time_nsecs()) * 1E-9;
+#else
+  timespec t;
+  clock_gettime(CLOCK_MONOTONIC, &t);
+  return t.tv_sec + t.tv_nsec * 1E-9;
+#endif
+}
+
+}  // namespace jxl