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The Linux implementation of //ui/base/idle was X11-only and was not
aware of Ozone.

This CL fixes that by moving the necessary pieces from //ui/base/idle to
//ui/base/x and extending the Screen and PlatformScreen interfaces with
two methods: IsScreenSaverActive() and CalculateIdleTime().

Bug: 1098201, 1098202
Change-Id: I5ab4dcde323562000b3b3870a778ba3515a774d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2504234
Commit-Queue: Alexander Dunaev <adunaev@igalia.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822537}