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The Standard Gamepad spec lays out a standard configuration for gamepad
buttons and axes. The browser attempts to remap the buttons and axes
reported by connected devices to more closely match the standard. In
most cases, a suitable mapping function can be chosen from the vendor
and product IDs reported by the device.

In some cases this is not sufficient; for instance, some devices are
supported over both USB and Bluetooth and require different mapping
functions in either case. To help select a mapping function in these
cases, a |bus_type| parameter is added to
GetGamepadStandardMappingFunction to specify whether the device is
connected over USB or Bluetooth.

BUG=749295

Change-Id: I566e06f5d34eeac269a0a70e912f74a64ccd19f5
Reviewed-on: https://chromium-review.googlesource.com/887231Reviewed-by: Brandon Jones <bajones@chromium.org>
Commit-Queue: Matt Reynolds <mattreynolds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532583}