WIP: A couple of more ChannelMojo speedup ideas

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

Index: third_party/mojo/src/mojo/edk/system/channel.cc
diff --git a/third_party/mojo/src/mojo/edk/system/channel.cc b/third_party/mojo/src/mojo/edk/system/channel.cc
index 71d7208803e3736dd916362c61b1930ddf490533..e1e46d73827b9f6b5f2bebee7e24c49180164248 100644
--- a/third_party/mojo/src/mojo/edk/system/channel.cc
+++ b/third_party/mojo/src/mojo/edk/system/channel.cc
@@ -364,16 +364,16 @@ void Channel::OnReadMessageForEndpoint(
     return;
   }
 
-  scoped_ptr<MessageInTransit> message(new MessageInTransit(message_view));
+  MessageInTransit::ReadContext reading_message(message_view);
   if (message_view.transport_data_buffer_size() > 0) {
     DCHECK(message_view.transport_data_buffer());
-    message->SetDispatchers(TransportData::DeserializeDispatchers(
+    reading_message.set_dispatchers(TransportData::DeserializeDispatchers(
         message_view.transport_data_buffer(),
         message_view.transport_data_buffer_size(), platform_handles.Pass(),
         this));
   }
 
-  endpoint->OnReadMessage(message.Pass());
+  endpoint->OnReadMessage(reading_message);
 }
 
 void Channel::OnReadMessageForChannel(