Add a whitespace file to test auto cherry picker. Bug: chromium:428685230 Change-Id: Ie74d974c624cd4a9f0963a9f27e5796469b01b9e Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6684312 Commit-Queue: Yuly Novikov <ynovikov@chromium.org> Reviewed-by: Yuxin Hu <yuxinhu@google.com>