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This change switches the gamepad id of WMR controllers in chrome to
match the value reported in Edge, which is of the format:
Spatial Controller (Spatial Interaction Source) <vendor id>-<product id>

This ensures the greatest compatibility with existing libraries and
prevents fragmentation for developers.

In order to expose this, the vendor id/product id are queried from the
controller if available, and plumbed up through XRGamepad's VRPose
by way of creating a device::Gamepad attached to a dummy
XRInputSourceState.

WMRController is created as a separate class (rather than simply adding
Vendor/ProductId as properties on WMRInputSource), as that is also where
methods for controller haptics live, and it would need to be split out
at that time.

Bug: 957281
Change-Id: Ib17ebf0e274719c3d974800eb0c0deb96af321e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636562
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Bill Orr <billorr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664908}