Some parts of the wrapped scripts seem to expect cwd to be
the v8 directory.

BUG=chromium:535160
LOG=n
TBR=tandrii@chromium.org, kjellander@chromium.org, mstarzinger@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1700963003

Cr-Commit-Position: refs/heads/master@{#34059}