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

mojo/edk/system/waiter.h

Index: mojo/edk/system/waiter.h
diff --git a/mojo/edk/system/waiter.h b/mojo/edk/system/waiter.h
index 1af19c04fa7a1b08e74ccd108d21c185968e850b..229214a80f5d8d1374b352787dce77a606a8d223 100644
--- a/mojo/edk/system/waiter.h
+++ b/mojo/edk/system/waiter.h
@@ -57,9 +57,10 @@ class Waiter final : public Awakable {
   //     pipe is closed).
   MojoResult Wait(MojoDeadline deadline, uint64_t* context);
 
-  // Wake the waiter up with the given result and context (or no-op if it's been
-  // woken up already).
-  bool Awake(MojoResult result, uint64_t context) override;
+  // |Awakable| implementation:
+  bool Awake(uint64_t context,
+             AwakeReason reason,
+             const HandleSignalsState& signals_state) override;
 
  private:
   util::CondVar cv_;  // Associated to |mutex_|.