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Put these conversions in web_scheduling_priority.{cc,h}, next to the definition
of the WebSchedulingPriority enum

Change-Id: I329c581566b24029226524c1e1c8043b123d5589
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1785477Reviewed-by: Scott Haseley <shaseley@chromium.org>
Commit-Queue: Nate Chapin <japhet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694352}