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Also adding JS type checking in the process.

Bug: 1028829
Change-Id: Ie5efb57026fdc544dfc969c254383e2658c5fd72
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1956045
Commit-Queue: John Lee <johntlee@chromium.org>
Auto-Submit: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722676}