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Previously the input was physical pixels, so it scaled to DIP when not
using zoom-for-dsf. Now the input is DIP, so we must scale the other
way.

R=piman@chromium.org

Bug: 937602
Change-Id: If51e092ffe6e4e7e72da24315f6cc70b2330022a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1504224Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637891}