Clang-format the codebase

BUG=None
TEST=clang-format --style=Chromium -i *.cc *.h

Change-Id: Ia2359ab508971d02d05d347e952ae5e33d060131
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/glbench/+/3061325
Reviewed-by: Ilja H. Friedel <ihf@chromium.org>
Commit-Queue: Ilja H. Friedel <ihf@chromium.org>
Commit-Queue: Po-Hsien Wang <pwang@chromium.org>
Tested-by: Po-Hsien Wang <pwang@chromium.org>
Auto-Submit: Po-Hsien Wang <pwang@chromium.org>