Add script to generate the v8 version.
Add script to generate the v8 version.

BUG=chromium:446166
LOG=n
TBR=jkummerow@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/835903003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#25964}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh