WIP: A couple of more ChannelMojo speedup ideas

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

Index: third_party/mojo/src/mojo/edk/system/message_pipe_endpoint.h
diff --git a/third_party/mojo/src/mojo/edk/system/message_pipe_endpoint.h b/third_party/mojo/src/mojo/edk/system/message_pipe_endpoint.h
index 0b5f12eb7ff5480f88c0ef3f24f0196853d39b60..d6fd343c5d6852e6ab603afe38a3c60aa66bdc48 100644
--- a/third_party/mojo/src/mojo/edk/system/message_pipe_endpoint.h
+++ b/third_party/mojo/src/mojo/edk/system/message_pipe_endpoint.h
@@ -50,6 +50,8 @@ class MOJO_SYSTEM_IMPL_EXPORT MessagePipeEndpoint {
   virtual void EnqueueMessage(scoped_ptr<MessageInTransit> message) = 0;
   virtual void Close() = 0;
 
+  virtual void OnReadMessage(MessageInTransit::ReadContext& reading_message);
+
   // Implementations must override these if they represent a local endpoint,
   // i.e., one for which there's a |MessagePipeDispatcher| (and thus a handle).
   // An implementation for a proxy endpoint (for which there's no dispatcher)
@@ -71,6 +73,8 @@ class MOJO_SYSTEM_IMPL_EXPORT MessagePipeEndpoint {
                                  HandleSignalsState* signals_state);
   virtual void RemoveAwakable(Awakable* awakable,
                               HandleSignalsState* signals_state);
+  virtual MojoResult SetAsyncMessageCallback(
+      const AsyncMessageCallback& callback);
 
   // Implementations must override these if they represent a proxy endpoint. An
   // implementation for a local endpoint needs not override these methods, since