Add different behavior to AwakableList for "persistent" vs "one-shot" awakables.

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 25ae5ff04e0861e2b621f8edcef903b862cbb063..1d844bbb8ce97b7d52ec2897803c319322c4f350 100644
--- a/mojo/edk/system/simple_dispatcher.cc
+++ b/mojo/edk/system/simple_dispatcher.cc
@@ -22,13 +22,13 @@ void SimpleDispatcher::OnHandleSignalsStateChangeNoLock(
 
 void SimpleDispatcher::CancelAllStateNoLock() {
   mutex().AssertHeld();
-  awakable_list_.CancelAll();
+  awakable_list_.CancelAndRemoveAll();
 }
 
 MojoResult SimpleDispatcher::AddAwakableImplNoLock(
     Awakable* awakable,
     uint64_t context,
-    bool force,
+    bool persistent,
     MojoHandleSignals signals,
     HandleSignalsState* signals_state) {
   mutex().AssertHeld();
@@ -37,17 +37,17 @@ MojoResult SimpleDispatcher::AddAwakableImplNoLock(
   if (signals_state)
     *signals_state = state;
   if (state.satisfies(signals)) {
-    if (force)
-      awakable_list_.Add(awakable, context, signals);
+    if (persistent)
+      awakable_list_.Add(awakable, context, persistent, signals);
     return MOJO_RESULT_ALREADY_EXISTS;
   }
   if (!state.can_satisfy(signals)) {
-    if (force)
-      awakable_list_.Add(awakable, context, signals);
+    if (persistent)
+      awakable_list_.Add(awakable, context, persistent, signals);
     return MOJO_RESULT_FAILED_PRECONDITION;
   }
 
-  awakable_list_.Add(awakable, context, signals);
+  awakable_list_.Add(awakable, context, persistent, signals);
   return MOJO_RESULT_OK;
 }