experimental/documentation/gerrit: authentication

NOTRY=true
Change-Id: I8d4f86848dcc37bcc0aead3700969ea4df6417db
Reviewed-on: https://skia-review.googlesource.com/59762
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
1 file changed