GitLab

Adds support for base::TimeDelta in PerfResultReporter. This is due to
many perf tests reporting time taken from a TimeDelta, and handling the
conversion from TimeDelta to double in PerfResultReporter makes its use
less error-prone since users no longer need to worry about matching the
registered units to the correct TimeDelta::In*seconds calls.

Bug: 923564
Change-Id: I30dd6bcf0f11489b671f20e6e776fbad4659729e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815081Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702153}