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Running tests will require a http server, puppeteer and some .js files
to do the actual testing in a browser. Add a script to drive the whole
testing process. Output:

  % npm run test
  tests PASS

If there was a test failure, a test.log is available to figure out the
problem.

Bug: 935285
Change-Id: I12f69008d37c67433901ed6a37a3d7e9375abac3
Reviewed-on: https://chromium-review.googlesource.com/c/1491155Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635923}