WIP: A couple of more ChannelMojo speedup ideas

third_party/mojo/src/mojo/edk/system/message_pipe_endpoint.cc

Index: third_party/mojo/src/mojo/edk/system/message_pipe_endpoint.cc
diff --git a/third_party/mojo/src/mojo/edk/system/message_pipe_endpoint.cc b/third_party/mojo/src/mojo/edk/system/message_pipe_endpoint.cc
index 4b8bc5e0afce17d924d55f0937df44315f790ea0..1522373616ffe147bf0c970bb7e71f7f045de9e7 100644
--- a/third_party/mojo/src/mojo/edk/system/message_pipe_endpoint.cc
+++ b/third_party/mojo/src/mojo/edk/system/message_pipe_endpoint.cc
@@ -44,6 +44,17 @@ void MessagePipeEndpoint::RemoveAwakable(Awakable* /*awakable*/,
     *signals_state = HandleSignalsState();
 }
 
+MojoResult MessagePipeEndpoint::SetAsyncMessageCallback(
+    const AsyncMessageCallback& callback) {
+  NOTREACHED();
+  return MOJO_RESULT_INTERNAL;
+}
+
+void MessagePipeEndpoint::OnReadMessage(
+    MessageInTransit::ReadContext& reading_message) {
+  EnqueueMessage(reading_message.PassMessage());
+}
+
 void MessagePipeEndpoint::Attach(ChannelEndpoint* /*channel_endpoint*/) {
   NOTREACHED();
 }