Plumb the handle signals state out of Waiter::Wait().

mojo/edk/system/core.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 <limits>
 #include <memory>
 #include <utility>
 #include <vector>
@@ skipping 785 matching lines @@
     if (result != MOJO_RESULT_OK) {
       *result_index = i;
       break;
     }
   }
   uint32_t num_added = i;
 
   if (result == MOJO_RESULT_ALREADY_EXISTS)
     result = MOJO_RESULT_OK;  // The i-th one is already "triggered".
   else if (result == MOJO_RESULT_OK)
-    result = waiter.Wait(deadline, result_index);
+    result = waiter.Wait(deadline, result_index, nullptr);
 
   // Make sure no other dispatchers try to wake |waiter| for the current
   // |Wait()|/|WaitMany()| call. (Only after doing this can |waiter| be
   // destroyed, but this would still be required if the waiter were in TLS.)
   for (i = 0; i < num_added; i++) {
     dispatchers[i]->RemoveAwakable(
         &waiter, signals_states ? &signals_states[i] : nullptr);
   }
   if (signals_states) {
     for (; i < num_handles; i++)
       signals_states[i] = dispatchers[i]->GetHandleSignalsState();
   }
 
   return result;
 }
 
 }  // namespace system
 }  // namespace mojo