[Perf] Enable smoothness.* benchmarks for histogram uploads

Landing this for eakuefner@ since he's OOO this week.

This CL switches smoothness.* benchmarks to the histogram pipeline.

Bug: 744736
Change-Id: Ic9a52a0785deb7df3b3b2e065c4db7ba3b6a2fcf
Reviewed-on: https://chromium-review.googlesource.com/1059933
Commit-Queue: Simon Hatch <simonhatch@chromium.org>
Reviewed-by: Emily Hanley <eyaich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558965}