Inside Chromium checkout, run-perf-tests doesn't run due to the missing pretty patch
Unable to find .../third_party/WebKit/Websites/bugs.webkit.org/PrettyPatch/prettify.rb;
can't generate pretty patches.
run-perf-tests shouldn't depend on pretty patch since we don't generate any diffs.
pretty patch is optional; that should just be a warning and not stopping anything from running ... is it actually failing something?