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The Switch Pro controller is usable when connected by USB or Bluetooth,
but defaults to a Bluetooth-only mode. This CL adds methods for
recognizing Switch Pro controllers, sending the vendor-specific packets
used for USB initialization and haptics, and reading controller data
reports.

BUG=801717

Change-Id: I076b001c5eda3c9e4900cb2a0ab19b78ef94d0da
Reviewed-on: https://chromium-review.googlesource.com/891621Reviewed-by: Brandon Jones <bajones@chromium.org>
Commit-Queue: Matt Reynolds <mattreynolds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533173}