GitLab

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

Bug: 1051750
Change-Id: I4d1e6054ce940d975710d8114f2f193304b554c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134236Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758456}