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Blocking the power save mode has platform-specific bits.  Ozone didn't
have any support for that.

This CL introduces the concept of a power save blocker for Ozone, and
implements the X11-specific part of it.

Bug: 1121926
Change-Id: Ic60210b55808cb30e27b0811e5fade69ac01512e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2378071
Commit-Queue: Alexander Dunaev <adunaev@igalia.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812580}