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In the DevTools flex tooling project, we want to be able to control how
the empty space (created by justify-content, align-content and gap
properties) look.
We want to do so in a way that allows to highlight just one, or several
of them.

So this CL simply adds the required properties to the corresponding CDP
types as well as handling of this data so it goes to the overlay
frontend.

Bug: 1139949
Change-Id: Ibfbd33531f3f2018447d113807f3878b823cfd40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2539742
Commit-Queue: Patrick Brosset <patrick.brosset@microsoft.com>
Reviewed-by: Alex Rudenko <alexrudenko@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828846}