Use DSF instead of UI scale if the native DSF is 1.25  and UI Scale is 0.8x (dsf=1.25 equivalent)

Disable high DPI assets for ui scaling. This will be removed in 39, after this change is landed.

BUG=413368

Review URL: https://codereview.chromium.org/578553002

Cr-Commit-Position: refs/heads/master@{#295209}
5 files changed