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

mojo/edk/system/message_pipe_dispatcher_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.
 
 // NOTE(vtl): Some of these tests are inherently flaky (e.g., if run on a
 // heavily-loaded system). Sorry. |test::EpsilonTimeout()| may be increased to
 // increase tolerance and reduce observed flakiness (though doing so reduces the
 // meaningfulness of the test).
 
 #include "mojo/edk/system/message_pipe_dispatcher.h"
 
 #include <string.h>
 
 #include <limits>
 #include <memory>
 #include <utility>
 #include <vector>
 
+#include "mojo/edk/platform/thread_utils.h"
 #include "mojo/edk/system/message_pipe.h"
 #include "mojo/edk/system/test/random.h"
 #include "mojo/edk/system/test/simple_test_thread.h"
-#include "mojo/edk/system/test/sleep.h"
 #include "mojo/edk/system/test/stopwatch.h"
 #include "mojo/edk/system/test/timeouts.h"
 #include "mojo/edk/system/waiter.h"
 #include "mojo/edk/system/waiter_test_utils.h"
 #include "mojo/edk/util/make_unique.h"
 #include "mojo/edk/util/ref_ptr.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using mojo::platform::ThreadSleep;
 using mojo::util::MakeUnique;
 using mojo::util::RefPtr;
 
 namespace mojo {
 namespace system {
 namespace {
 
 const MojoHandleSignals kAllSignals = MOJO_HANDLE_SIGNAL_READABLE |
                                       MOJO_HANDLE_SIGNAL_WRITABLE |
                                       MOJO_HANDLE_SIGNAL_PEER_CLOSED;
@@ skipping 328 matching lines @@
       d1->Init(std::move(mp), i ^ 1);  // 1, 0.
     }
 
     // Wait for readable on |d1|, which will become readable after some time.
     {
       test::WaiterThread thread(d1, MOJO_HANDLE_SIGNAL_READABLE,
                                 MOJO_DEADLINE_INDEFINITE, 1, &did_wait, &result,
                                 &context, &hss);
       stopwatch.Start();
       thread.Start();
-      test::Sleep(2 * test::EpsilonTimeout());
+      ThreadSleep(2 * test::EpsilonTimeout());
       // Wake it up by writing to |d0|.
       buffer[0] = 123456789;
       EXPECT_EQ(MOJO_RESULT_OK,
                 d0->WriteMessage(UserPointer<const void>(buffer), kBufferSize,
                                  nullptr, MOJO_WRITE_MESSAGE_FLAG_NONE));
     }  // Joins the thread.
     elapsed = stopwatch.Elapsed();
     EXPECT_GT(elapsed, (2 - 1) * test::EpsilonTimeout());
     EXPECT_LT(elapsed, (2 + 1) * test::EpsilonTimeout());
     EXPECT_TRUE(did_wait);
@@ skipping 29 matching lines @@
     EXPECT_EQ(123456789, buffer[0]);
 
     // Wait for readable on |d1| and close |d0| after some time, which should
     // cancel that wait.
     {
       test::WaiterThread thread(d1, MOJO_HANDLE_SIGNAL_READABLE,
                                 MOJO_DEADLINE_INDEFINITE, 3, &did_wait, &result,
                                 &context, &hss);
       stopwatch.Start();
       thread.Start();
-      test::Sleep(2 * test::EpsilonTimeout());
+      ThreadSleep(2 * test::EpsilonTimeout());
       EXPECT_EQ(MOJO_RESULT_OK, d0->Close());
     }  // Joins the thread.
     elapsed = stopwatch.Elapsed();
     EXPECT_GT(elapsed, (2 - 1) * test::EpsilonTimeout());
     EXPECT_LT(elapsed, (2 + 1) * test::EpsilonTimeout());
     EXPECT_TRUE(did_wait);
     EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION, result);
     EXPECT_EQ(3u, context);
     EXPECT_EQ(MOJO_HANDLE_SIGNAL_PEER_CLOSED, hss.satisfied_signals);
     EXPECT_EQ(MOJO_HANDLE_SIGNAL_PEER_CLOSED, hss.satisfiable_signals);
@@ skipping 13 matching lines @@
     }
 
     // Wait for readable on |d1| and close |d1| after some time, which should
     // cancel that wait.
     {
       test::WaiterThread thread(d1, MOJO_HANDLE_SIGNAL_READABLE,
                                 MOJO_DEADLINE_INDEFINITE, 4, &did_wait, &result,
                                 &context, &hss);
       stopwatch.Start();
       thread.Start();
-      test::Sleep(2 * test::EpsilonTimeout());
+      ThreadSleep(2 * test::EpsilonTimeout());
       EXPECT_EQ(MOJO_RESULT_OK, d1->Close());
     }  // Joins the thread.
     elapsed = stopwatch.Elapsed();
     EXPECT_GT(elapsed, (2 - 1) * test::EpsilonTimeout());
     EXPECT_LT(elapsed, (2 + 1) * test::EpsilonTimeout());
     EXPECT_TRUE(did_wait);
     EXPECT_EQ(MOJO_RESULT_CANCELLED, result);
     EXPECT_EQ(4u, context);
     EXPECT_EQ(0u, hss.satisfied_signals);
     EXPECT_EQ(0u, hss.satisfiable_signals);
@@ skipping 206 matching lines @@
   EXPECT_EQ(total_messages_written, total_messages_read);
   EXPECT_EQ(total_bytes_written, total_bytes_read);
 
   EXPECT_EQ(MOJO_RESULT_OK, d_write->Close());
   EXPECT_EQ(MOJO_RESULT_OK, d_read->Close());
 }
 
 }  // namespace
 }  // namespace system
 }  // namespace mojo