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This adds a black-box test of the webrunner's functionality as a runner
for http:// URLs in Fuchsia. The test opens up a random port on the
device, instantiates web runner via launching a web URL, then verifies
that the URL is fetched and parsed.

Change-Id: If3084760eb96bdc9c609ab9beef1a3507ee77011
Reviewed-on: https://chromium-review.googlesource.com/c/1387813
Commit-Queue: James Robinson <jamesr@chromium.org>
Reviewed-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#618403}