The types from msg_socket were assumed to be in scope for the custom
derive implementation, which would cause mysterious compiler errors if
the custom derive was invoked in a module without msg_socket types in
scope.
This CL uses fully qualified types in the generated output to avoid
these errors.
This change also uses `extern crate msg_socket` in case the call site
doesn't have it in scope.
BUG=None
TEST=cargo test -p msg_on_socket_derive
Change-Id: Ie6443cd4ffc070d27e71de123090a58f19846472
Reviewed-on: https://chromium-review.googlesource.com/1314208
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Zach Reizner <zachr@chromium.org>
Reviewed-by: Jingkui Wang <jkwang@google.com>
