Initialize the package in Chrome OS

First commit in Chrome OS, do the following things,

1. Add BUILD.gn.
2. Modify some source code to avoid "-Wunreachable-code-return" error.
3. Add LICENSE and OWNERS file.

BUG=1086044
TEST=Can compile. And the lang-id works based on it.

Exempt-From-Owner-Approval: The existing OWNER is from AOSP.

Change-Id: Ie0531221fac4648540b9d56cb7c91e5756da7706
Reviewed-on: https://chromium-review.googlesource.com/c/aosp/platform/external/libutf/+/2248286
Tested-by: Honglin Yu <honglinyu@chromium.org>
Commit-Queue: Honglin Yu <honglinyu@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
6 files changed