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To convert from screen coordinates to the normalized absolute
coordinates dimensions used by SendInput, the scaling factor should be
(65536.0 / screen_dimension).

Previously, we used (65535.0 / (screen_dimension - 1)). Although the
difference between these two factors is small, the discrepancy becomes
more prominent when it's multiplied out. This discrepancy may lead to
the computed absolute coordinates being off by a pixel or two depending
on the resolution of the screen in question.

Change-Id: Id305abc6ddf904ffbbb07dc740c655ac1be3cf83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2278347Reviewed-by: David Bienvenu <davidbienvenu@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: Chege Gitau <dagitau@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#786075}