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This rolls testharness.js, idlharness.js, and testdriver-actions.js from
the external copy in external/wpt/resources/ to the internal copy in
resources/, bringing us up to WPT SHA 2d15a10a

Bug: None
Change-Id: I95d4ed0d10ffd5833162e3051c4613428c575757
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2222443
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Auto-Submit: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Luke Z <lpz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773212}