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These tests are occasionally failing with timeouts, and seem slow when
run locally in a debug build, so split the tests into 3 suites instead
of one to reduce the chances of timing out.

Also re-enabling a test case that no longer appears to be flaky, and
adding closure compilation for this test file.

Bug: 1000989, 1060981
Change-Id: I8d6f17bc398e40b9585f3f21c8e30e75565a126d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2316856Reviewed-by: John Lee <johntlee@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791438}