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These tests passed on the WPT fyi bot but weren't tested in the
layout tests because the testdriver-vendor.js didn't have plumbing
for the non chromedriver path.

Since our waterfall generally runs this path it is wise to add this
support to this code path.

BUG=626703

Change-Id: I9f0c91198146535a2d5cdb71baa29d463820ddd1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129017Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755077}