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

mojo/edk/system/message_pipe_dispatcher.cc

Index: mojo/edk/system/message_pipe_dispatcher.cc
diff --git a/mojo/edk/system/message_pipe_dispatcher.cc b/mojo/edk/system/message_pipe_dispatcher.cc
index 5b0454a90dfa3324ab8e91f6ce0537bc9ebb8ade..e57264ae93bc55dc82fb19f84d1c89b1a34675f7 100644
--- a/mojo/edk/system/message_pipe_dispatcher.cc
+++ b/mojo/edk/system/message_pipe_dispatcher.cc
@@ -203,10 +203,11 @@ HandleSignalsState MessagePipeDispatcher::GetHandleSignalsStateImplNoLock()
 MojoResult MessagePipeDispatcher::AddAwakableImplNoLock(
     Awakable* awakable,
     MojoHandleSignals signals,
+    bool force,
     uint64_t context,
     HandleSignalsState* signals_state) {
   mutex().AssertHeld();
-  return message_pipe_->AddAwakable(port_, awakable, signals, context,
+  return message_pipe_->AddAwakable(port_, awakable, signals, force, context,
                                     signals_state);
 }