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If there is a device that we see as a gamepad it takes up one of the 4
slots for gamepads on a machine.  This causes a large problem when users
need all 4 slots especially if that device is built into the machine.
This CL replaces unrecognized gamepads with recognized ones if we have
more than 4 gamepads.

Bug: 991842
Change-Id: I8964294fd50a4a4b941454fc76ee389859859a29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1759339
Commit-Queue: James Hollyer <jameshollyer@chromium.org>
Reviewed-by: Matt Reynolds <mattreynolds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701391}