Plumb the handle signals state to Awakable::Awake().

mojo/edk/system/async_waiter.h

Index: mojo/edk/system/async_waiter.h
diff --git a/mojo/edk/system/async_waiter.h b/mojo/edk/system/async_waiter.h
index 031b048c2296a4d340432aebf9a9905fc546f54f..5e405bf790503b249dd8d83ee734f43770fc022f 100644
--- a/mojo/edk/system/async_waiter.h
+++ b/mojo/edk/system/async_waiter.h
@@ -25,7 +25,9 @@ class AsyncWaiter final : public Awakable {
 
  private:
   // |Awakable| implementation:
-  bool Awake(MojoResult result, uint64_t context) override;
+  bool Awake(uint64_t context,
+             AwakeReason reason,
+             const HandleSignalsState& signals_state) override;
 
   AwakeCallback callback_;