Add wasm benchmark for tanks(unity)

[email protected],[email protected]
BUG=v8:5558

Change-Id: I73987b6018806a13fbcf636a6b122a4cb7530252
Reviewed-on: https://chromium-review.googlesource.com/765013
Commit-Queue: Aseem Garg <[email protected]>
Reviewed-by: Ned Nguyen <[email protected]>
Cr-Commit-Position: refs/heads/master@{#518149}
5 files changed