This is a reland of a12203c6

Original change's description:
> [wasm] Add a new wasm-js testsuite to run js-api tests
> 
> These changes were necessary to run with the new style of jsapi tests
> introduced in https://github.com/WebAssembly/spec/pull/883.
> 
> Change-Id: I4629dd48d595ed97ed0607dec9e7d9808c706a7e
> Reviewed-on: https://chromium-review.googlesource.com/c/1277724
> Commit-Queue: Ben Smith <binji@chromium.org>
> Reviewed-by: Andreas Haas <ahaas@chromium.org>
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Reviewed-by: Mathias Bynens <mathias@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#56745}

Change-Id: I25fcd95bfc1aee1d21da390359423e5dfed112a4
Reviewed-on: https://chromium-review.googlesource.com/c/1286952
Commit-Queue: Ben Smith <binji@chromium.org>
Reviewed-by: Ben Smith <binji@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56791}