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This CL makes sure that LaCros windows receive big enough
wl_output.scale from exo when display scale is fractional by rounding it
up to the closest integer.

This is similar to how other compositors (Mutter, Sway) deal with
fractional scaling: clients are only aware of integer scaling and the
actual contents of windows are scaled down on the compositor side
(it's already done in Aura in our case).

Bug: 1093021
Change-Id: Ia47dd60dc0cb60396028c1ce108e095ecc84884f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404930Reviewed-by: Mitsuru Oshima (Slow: gardener) <oshima@chromium.org>
Commit-Queue: Zakhar Voit <zvoit@igalia.com>
Cr-Commit-Position: refs/heads/master@{#806494}