Long lines in source files are bad, but sometimes unavoidable. Since
ignoring warnings is even worse than long lines it is wise to have a way
to disable the warning. This change adds support for a multi-language
tag that can be put in unavoidably long lines.

Bug: 1309977
Change-Id: I205086050b5aa5b4a02a651c06615c82ec0e1a38
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3896084Reviewed-by: Dmitrii Kuragin <kuragin@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>