[perf] Add load:games:spychase:2018 system health story

This CL was created automatically with tools/perf/update_wpr script.

There are 3 failing requests due to missing files which is also the case
on the live page.

R=perezju@chromium.org

Bug: 878390
Change-Id: I0732f3b5907ba44bca81f1a772ee00aec3bb37b3
Reviewed-on: https://chromium-review.googlesource.com/c/1329664
Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608331}