This is what Chromium is moving to, and what WebRTC is using.
Next step: pull xcode via CIPD.

Bug:chromium:633032
Change-Id: I6a21aa0e5b212a3a9cb4e7cc79ebb614a89f73ed
Reviewed-on: https://chromium-review.googlesource.com/915921
Commit-Queue: Patrik Höglund <phoglund@chromium.org>
Reviewed-by: Frank Barchard <fbarchard@chromium.org>