GitLab

Add turn on/off translate switch.
Read accept_langauges from native and show them in the languages page.
For each language item, add a fake option memu.
Screenshot: https://screenshot.googleplex.com/0HOVztouukP

Bug: 783049
Change-Id: If420d76fe12ecbff277bcd6e4ab7a3a7a3419f63
Reviewed-on: https://chromium-review.googlesource.com/762540
Commit-Queue: Leo Zhang <googleo@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Maria Khomenko <mariakhomenko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520715}