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On some platforms (including CrOS, as of crrev.com/c/2277694) ordinal
motion will be available as part of mouse motion events.

We use ordinal motion to provide unaccelerated motion in the
zwp_relative_pointer interface. In the event that ordinal motion is not
available, we default to the old behaviour (i.e. using accelerated
motion).

This behaviour is guarded by a flag, as the units it provides on CrOS
are disproportionately small (compared with the standard cursor
acceleration).

Bug: b/161755250
Change-Id: I774db6ef7db7460f1c5674fffdaca65e7fb170fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2371088
Commit-Queue: Nic Hollingum <hollingum@google.com>
Reviewed-by: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811137}