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On windows release 1809 (and presumably up), input was not being routed
to the chromium webxr process/threads.  This resulted in polling tracked
controllers and subscriptions to input events never firing or returning
any controllers.  This change has no effect on 1803.

Bug: 953129
Change-Id: Ifdfbd47906b1d5817e791449ac94235e346ea0e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1577485
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Bill Orr <billorr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652913}