Add Core methods for wait set.

mojo/edk/system/wait_set_dispatcher.cc

 // Copyright 2016 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/wait_set_dispatcher.h"
 
 #include <string.h>
 
 #include <algorithm>
 #include <limits>
@@ skipping 134 matching lines @@
 RefPtr<Dispatcher>
 WaitSetDispatcher::CreateEquivalentDispatcherAndCloseImplNoLock(
     MessagePipe* /*message_pipe*/,
     unsigned /*port*/) {
   mutex().AssertHeld();
   NOTREACHED();
   return nullptr;
 }
 
 MojoResult WaitSetDispatcher::WaitSetAddImpl(
-    UserPointer<const MojoWaitSetAddOptions> options,
     RefPtr<Dispatcher>&& dispatcher,
     MojoHandleSignals signals,
-    uint64_t cookie) {
+    uint64_t cookie,
+    UserPointer<const MojoWaitSetAddOptions> options) {
   // This will be owned by |entries_|, so it should only be used under
   // |mutex()|.
   Entry* entry = nullptr;
   {
     MutexLocker locker(&mutex());
     if (is_closed_no_lock())
       return MOJO_RESULT_INVALID_ARGUMENT;
     MojoWaitSetAddOptions validated_options;
     MojoResult result = ValidateWaitSetAddOptions(options, &validated_options);
     if (result != MOJO_RESULT_OK)
@@ skipping 291 matching lines @@
   } else {
     entry->triggered_next->triggered_previous = entry->triggered_previous;
   }
 
   entry->triggered_previous = nullptr;
   entry->triggered_next = nullptr;
 }
 
 }  // namespace system
 }  // namespace mojo