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

mojo/edk/system/core_unittest.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/core.h"
 
 #include <stdint.h>
 
 #include <limits>
 
+#include "mojo/edk/platform/thread_utils.h"
 #include "mojo/edk/system/awakable.h"
 #include "mojo/edk/system/core_test_base.h"
-#include "mojo/edk/system/test/sleep.h"
+#include "mojo/edk/system/test/timeouts.h"
 #include "mojo/public/cpp/system/macros.h"
 
+using mojo::platform::ThreadSleep;
+
 namespace mojo {
 namespace system {
 namespace {
 
 const MojoHandleSignalsState kEmptyMojoHandleSignalsState = {0u, 0u};
 const MojoHandleSignalsState kFullMojoHandleSignalsState = {~0u, ~0u};
 const MojoHandleSignals kAllSignals = MOJO_HANDLE_SIGNAL_READABLE |
                                       MOJO_HANDLE_SIGNAL_WRITABLE |
                                       MOJO_HANDLE_SIGNAL_PEER_CLOSED;
 
 using CoreTest = test::CoreTestBase;
 
 TEST_F(CoreTest, GetTimeTicksNow) {
   const MojoTimeTicks start = core()->GetTimeTicksNow();
   EXPECT_NE(static_cast<MojoTimeTicks>(0), start)
       << "GetTimeTicksNow should return nonzero value";
-  test::SleepMilliseconds(15u);
+  ThreadSleep(test::DeadlineFromMilliseconds(15u));
   const MojoTimeTicks finish = core()->GetTimeTicksNow();
   // Allow for some fuzz in sleep.
   EXPECT_GE((finish - start), static_cast<MojoTimeTicks>(8000))
       << "Sleeping should result in increasing time ticks";
 }
 
 TEST_F(CoreTest, Basic) {
   MockHandleInfo info;
 
   EXPECT_EQ(0u, info.GetCtorCallCount());
@@ skipping 1264 matching lines @@
   EXPECT_EQ(MOJO_RESULT_BUSY, waiter.result);
 
   EXPECT_EQ(MOJO_RESULT_OK, core()->Close(h));
 }
 
 // TODO(vtl): Test |DuplicateBufferHandle()| and |MapBuffer()|.
 
 }  // namespace
 }  // namespace system
 }  // namespace mojo