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CSSWG resolved back in January 2017 about how percentage rows
in a grid container with indefinite height work, to make them symmetric
to what happens for columns. Which has been ratified in the last
F2F meeting at TPAC 2017.
All this has been discussed in the following issue:
https://github.com/w3c/csswg-drafts/issues/1921

No browser is doing that right now, so it'd be nice to gather some data
about the usage of this before changing the implementation.
For that reason this patch adds a new use counter to check
when this change will have impact on real websites.

Change-Id: I61b82957d2bfe53912fd3e53a6bd41a6491a67be
Reviewed-on: https://chromium-review.googlesource.com/796855Reviewed-by: Christian Biesinger <cbiesinger@chromium.org>
Commit-Queue: Manuel Rego Casasnovas <rego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#520213}