Add //mojo/edk/platform/thread_utils.* containing "yield" and "sleep".

mojo/edk/system/test/sleep.cc

-// Copyright 2013 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 "mojo/edk/system/test/sleep.h"
-
-#include <errno.h>
-#include <stdint.h>
-#include <time.h>
-
-#include <limits>
-
-#include "base/logging.h"
-#include "mojo/edk/system/test/timeouts.h"
-
-namespace mojo {
-namespace system {
-namespace test {
-
-void Sleep(MojoDeadline duration) {
-  // TODO(vtl): This doesn't handle |MOJO_DEADLINE_INDEFINITE|. Should it?
-  DCHECK_NE(duration, MOJO_DEADLINE_INDEFINITE);
-
-  const uint64_t kMicrosecondsPerSecond = 1000000ULL;
-  const uint64_t kNanosecondsPerMicrosecond = 1000ULL;
-
-  uint64_t sleep_time_seconds = duration / kMicrosecondsPerSecond;
-  // |sleep_time.tv_sec| is a |time_t|.
-  DCHECK_LE(sleep_time_seconds,
-            static_cast<uint64_t>(std::numeric_limits<time_t>::max()));
-  uint64_t sleep_time_nanoseconds =
-      (duration % kMicrosecondsPerSecond) * kNanosecondsPerMicrosecond;
-
-  struct timespec sleep_time;
-  sleep_time.tv_sec = static_cast<time_t>(sleep_time_seconds);
-  sleep_time.tv_nsec = static_cast<long>(sleep_time_nanoseconds);
-
-  struct timespec sleep_time_remaining;
-  while (nanosleep(&sleep_time, &sleep_time_remaining) == -1) {
-    PCHECK(errno == EINTR) << "nanosleep";
-    sleep_time = sleep_time_remaining;
-  }
-}
-
-void SleepMilliseconds(unsigned duration_milliseconds) {
-  Sleep(DeadlineFromMilliseconds(duration_milliseconds));
-}
-
-}  // namespace test
-}  // namespace system
-}  // namespace mojo