monobench: shuffle benchmark order between samples

I had the thought that going through each bench in the same order is a bias we can avoid, however slight.

Change-Id: I2ef1a6f57c4d121883250d65ea2e98ebe834925d
Reviewed-on: https://skia-review.googlesource.com/6622
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed