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Some platforms might not support that, but still would like to provide
a default value.

In case of Wayland, it depends on xdg decoration extension protocol,
support for which will be added later.

Bug: 990756
Change-Id: I550104522a729ae154711e4fb61b80b8878007ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1834347Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#702792}