Add --timescale to bench_record and bench_playback.

Default bench_record to report us, bench_playback ms.

BUG=skia:2378
R=mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/253843004

git-svn-id: http://skia.googlecode.com/svn/trunk@14417 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed