GitLab

It's multi-sided patch, so again it has ugly ifdefs.

Corresponding blink patch:
https://codereview.chromium.org/23704004/

BUG=257349
TEST=try, both with and without Blink patch

Review URL: https://chromiumcodereview.appspot.com/23762002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221710 0039d316-1c4b-4281-b951-d872f2087c98