Ignore .git_cl_description_backup depot_tools used to create this file in $HOME, but now stores it in the current repository. Bug: None Change-Id: Ia127c2273eb23e7acffd5d0cf7c61e5d4f521a0b Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1944528 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>