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As is, a few variables are sometimes in one coordinate space and
sometimes in another. Tweak the code so these variables always hold
values in screen coordinates, and add "_in_screen" to their names.

Change-Id: Idf84a449be85ef26de6b960b1e3796b99946f0b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1725260Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683280}