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MouseEvent.movement() stores the platoform-dependant "Raw mouse motion"
values, as reported by hardware. It is currently only available on
windows. Support for the value is indicated by the presence of the flag
EF_UNADJUSTED_MOUSE.

In this CL, we add support for this on CrOS. We intend to use this in
order to improve the relative pointer handling in Exo, which requires
unaccelerated mouse motion (and currently we only have access to
accelerated motion).

This change is only implemented for CrOS (for now) because:
 1) previously it was only implemented for windows, so cross-platform
    is not a hard requirement.
 2) For our use case, the intended user is zwp_relative_pointer.cc,
    which is only compiled for CrOS.

Bug: 957455
Change-Id: I9b6ca1740dcfb6aaba60c32f268270b3b0d386a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2277694Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Nic Hollingum <hollingum@google.com>
Cr-Commit-Position: refs/heads/master@{#804117}