Port https://codereview.chromium.org/2057053002/ for the
v8-side configurations.

BUG=chromium:616035
NOTRY=true
TBR=vogelheim@chromium.org, jochen@chromium.org

Review-Url: https://codereview.chromium.org/2066823002
Cr-Commit-Position: refs/heads/master@{#36967}