Add owners file to GN bootstrap.

Add comment to the top of the script to clarify support and to suggest the type of thing that usually goes wrong.

Review URL: https://codereview.chromium.org/1528863004

Cr-Original-Commit-Position: refs/heads/master@{#365290}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 484f322506039ab63ddfbcf3820932f561e5a0f9
2 files changed
tree: e47fe0208866a24e9d7fb934954d41bfc6b453bb
  1. tools/