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This change updates the WebUSB IDL files to expose the API, minus
requestDevice method, to Dedicated and Shared Workers. The change is
only available via a test runtime enabled flag. The global interface
listing tests are updated to match the newly exposed interface.

The spec for this feature can be found at:
https://wicg.github.io/webusb/#enumeration

Bug: 837414
Change-Id: I0bb9c2db50d63dc0a1363853610bb24f83897702
Reviewed-on: https://chromium-review.googlesource.com/1014196Reviewed-by: Chong Zhang <chongz@chromium.org>
Reviewed-by: Steve Kobes <skobes@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Ovidio Henriquez <odejesush@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554892}