Added benchmark retry support.

We often get spurious failures from the benchmarks runs. This CL adds
support for a "retries" field that will automatically retry the benchmark
run by the amount specified.

BUG=None
TEST=Test by hand.

Change-Id: Ib881c40d766e67a7daf855ce9137d3e3d631f12e
Reviewed-on: https://chrome-internal-review.googlesource.com/217525
Reviewed-by: Luis Lozano <llozano@chromium.org>
Tested-by: Luis Lozano <llozano@chromium.org>
Commit-Queue: Luis Lozano <llozano@chromium.org>
4 files changed