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This CL adds a method to UI Util to identify small devices.
A device is considered as a small if its logical width is less than or
equal to 375.

Bug: 922511
Change-Id: I3308d770f2ef502a088743ede9e81dcd0cb698ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2554997
Commit-Queue: Ewann Pellé <ewannpv@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830969}