We can use these perf routines to make our performance test output
compatible with the Chromium perf bots.

BUG=angle:744

Change-Id: I75a44786d4521fc0c7d8226f10575fcfda0fa221
Reviewed-on: https://chromium-review.googlesource.com/220360Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>