This tests migrates the service/getCharacteristics tests to wpt/.

BUG=509038

Change-Id: Ie5bb49d36b690d8f0d2b8131613baebb3823bdfd
Reviewed-on: https://chromium-review.googlesource.com/843050
Reviewed-by: Vincent Scheib <[email protected]>
Reviewed-by: Conley Owens <[email protected]>
Commit-Queue: Ovidio Henriquez <[email protected]>
Cr-Commit-Position: refs/heads/master@{#527752}