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We will then selectively downgrade tasks to USER_VISIBLE.

Eventually we want all task priorities to be either inherited or
explicitly set, so no defaults will be used. Roots will need to
explicitly set the priority (most likely USER_BLOCKING) thus that is a
good default for now.

Bug: 863341

Change-Id: I9872976bb944bc78dd43cbb6aff0cb5912043936
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1634702Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664726}