GitLab

- added .style.yapf file
- reformat *.py files

Bug: 1051750
Change-Id: Id52422ad244199d802c3c66afe480646e1672d37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2127112Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758450}