TBR=arv@chromium.org

Review URL: https://codereview.chromium.org/1129713004

Cr-Commit-Position: refs/heads/master@{#28380}

R=arv@chromium.org,verwaest@chromium.org
BUG=v8:4097
LOG=N

Review URL: https://codereview.chromium.org/1132203005

Cr-Commit-Position: refs/heads/master@{#28377}