Mojo: Base our epsilon timeouts off of TestTimeouts::tiny_timeout().

mojo/system/test_utils.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/system/test_utils.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/synchronization/waitable_event.h"
+#include "base/test/test_timeouts.h"
 
 namespace mojo {
 namespace system {
 namespace test {
 
 namespace {
 
 void PostTaskAndWaitHelper(base::WaitableEvent* event,
                            const base::Closure& task) {
   task.Run();
   event->Signal();
 }
 
 }  // namespace
 
 void PostTaskAndWait(scoped_refptr<base::TaskRunner> task_runner,
                      const tracked_objects::Location& from_here,
                      const base::Closure& task) {
   base::WaitableEvent event(false, false);
   task_runner->PostTask(from_here,
                         base::Bind(&PostTaskAndWaitHelper, &event, task));
   event.Wait();
 }
 
+base::TimeDelta EpsilonTimeout() {
+  // Originally, our epsilon timeout was 10 ms, which was mostly fine but flaky
+  // on some Windows bots. So I bumped it up to 30 ms, which made things
+  // reliable. Currently, |tiny_timeout()| is 100 ms, which means that this will
+  // be 25 ms, which will hopefully be okay.
+  return TestTimeouts::tiny_timeout() / 4;
+}
+
 // TestIOThread ----------------------------------------------------------------
 
 TestIOThread::TestIOThread(Mode mode)
     : io_thread_("test_io_thread"),
       io_thread_started_(false) {
   switch (mode) {
     case kAutoStart:
       Start();
       return;
     case kManualStart:
@@ skipping 25 matching lines @@
 }
 
 void TestIOThread::PostTaskAndWait(const tracked_objects::Location& from_here,
                                    const base::Closure& task) {
   ::mojo::system::test::PostTaskAndWait(task_runner(), from_here, task);
 }
 
 }  // namespace test
 }  // namespace system
 }  // namespace mojo