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As per suggestion [1], this switches exo::Seat's last_location_ variable
and SetLastLocation method to use gfx::PointF to handle last pointer
location. It'll be used in a followup CL as part of the extended-drag
protocol extension implementation in Exo [2].

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2307653/comment/45820a22_e6516518/
[2] https://chromium-review.googlesource.com/c/chromium/src/+/2401280

R=oshima@chromium.org

Bug: 1099418
Change-Id: I3be933f8788f748ff0324760d8f98b70e13b8d96
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410664
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Auto-Submit: Nick Yamane <nickdiego@igalia.com>
Reviewed-by: Mitsuru Oshima (Slow: gardener) <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806761}