Add an unconditional version of DispatcherAddAwakable(): AddAwakableUnconditional().

mojo/edk/system/simple_dispatcher.cc

Index: mojo/edk/system/simple_dispatcher.cc
diff --git a/mojo/edk/system/simple_dispatcher.cc b/mojo/edk/system/simple_dispatcher.cc
index f32b6283b479dd095fd3b081677fb7d9593c2fdd..48ee27d5cb888ca7cd8bbba94e74e0309a491d89 100644
--- a/mojo/edk/system/simple_dispatcher.cc
+++ b/mojo/edk/system/simple_dispatcher.cc
@@ -28,12 +28,15 @@ void SimpleDispatcher::CancelAllStateNoLock() {
 MojoResult SimpleDispatcher::AddAwakableImplNoLock(
     Awakable* awakable,
     MojoHandleSignals signals,
+    bool force,
     uint64_t context,
     HandleSignalsState* signals_state) {
   mutex().AssertHeld();
 
   HandleSignalsState state(GetHandleSignalsStateImplNoLock());
   if (state.satisfies(signals)) {
+    if (force)
+      awakable_list_.Add(awakable, signals, context);
     if (signals_state)
       *signals_state = state;
     return MOJO_RESULT_ALREADY_EXISTS;