GitLab

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

Bug: 1051750
Change-Id: I6ddf9f7e91c6a01bab7eed59d5d4f9b990636e65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2142231Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758449}