Make WaitableEvent's constructor enum-based.

base/synchronization/waitable_event_win.cc

 // Copyright (c) 2011 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 "base/synchronization/waitable_event.h"
 
 #include <windows.h>
 #include <stddef.h>
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
 
 namespace base {
 
+WaitableEvent::WaitableEvent(ResetPolicy reset_policy,
+                             InitialState initial_state)
+    : WaitableEvent(reset_policy == ResetPolicy::MANUAL,
+                    initial_state == InitialState::SIGNALED) {}
+
 WaitableEvent::WaitableEvent(bool manual_reset, bool signaled)
     : handle_(CreateEvent(NULL, manual_reset, signaled, NULL)) {
   // We're probably going to crash anyways if this is ever NULL, so we might as
   // well make our stack reports more informative by crashing here.
   CHECK(handle_.IsValid());
 }
 
 WaitableEvent::WaitableEvent(win::ScopedHandle handle)
     : handle_(std::move(handle)) {
   CHECK(handle_.IsValid()) << "Tried to create WaitableEvent from NULL handle";
@@ skipping 61 matching lines @@
                              INFINITE);  // no timeout
   if (result >= WAIT_OBJECT_0 + count) {
     DPLOG(FATAL) << "WaitForMultipleObjects failed";
     return 0;
   }
 
   return result - WAIT_OBJECT_0;
 }
 
 }  // namespace base