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Chrome for Mac recognizes "Made for iOS" (MFi) gamepads enumerated
by the GameController framework. When multiple such devices are
connected at once, Chrome fails to properly distinguish them.

GCController exposes a playerIndex field that defaults to the value
GCControllerPlayerIndexUnset (-1). The application may set this field
to a value between 0 and 3 to signal which LEDs should be lit on the
gamepad. Chrome also uses this field to distinguish gamepads, but does
not set the index to a unique value. This causes the first-connected
gamepad to shadow any other connected gamepads.

This CL ensures each connected MFi gamepad is assigned a unique player
index up to the OS-defined limit of four.

BUG=775270

Change-Id: Ieb852cadc5ff36f94aa1003de3f2e13538114661
Reviewed-on: https://chromium-review.googlesource.com/723852Reviewed-by: Brandon Jones <bajones@chromium.org>
Commit-Queue: Matt Reynolds <mattreynolds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509533}