This gives the tests more room to breathe, and report more
precision in the final scores. Hopefully this will clear up the
issues on the bots where some tests appear to fluctuate between a 
high and low value.

BUG=468852

Change-Id: Ie2793e0a89e5ded63ba4217828076df46c393a92
Reviewed-on: https://chromium-review.googlesource.com/270497Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>