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This adds a new build archive mojojs.zip that includes all *.mojom.js
needed for running these web platform tests.

Design doc and the tracking issue are Google-internal:
https://docs.google.com/document/d/1mz3KAQLadAspB1Fv3e14Fv4nVVvkAH455WhZvMr5gnU/edit?usp=sharing

Bug: 1094512
Change-Id: I52a226e422c99d86caad8430ddae704f1ae75910
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2247061Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Michael Moss <mmoss@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782971}