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This change creates an idlharness test for the workers to ensure that
all the interfaces are exposed in the worker. This change also updates
the webusb.idl file to match the exposure of the interfaces.

Bug: 841510
Change-Id: Iad72f242ee0cdbf9a3057828bd4bd5542f6fe063
Reviewed-on: https://chromium-review.googlesource.com/1053063
Commit-Queue: Ovidio Henriquez <odejesush@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Chong Zhang <chongz@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560399}