Place a copy of the v8-native-prototype in third_party/wasm.
GYP_DEFINES='v8_wasm=1' gclient runhooks

BUG=None
TEST=None
R=titzer@chromium.org
LOG=N

Review URL: https://codereview.chromium.org/1294543006

Cr-Commit-Position: refs/heads/master@{#30225}