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When a flex item has a definite specified height (e.g. height: 100px),
then percentages in children of the flex item should resolve even
if the flexbox does not have an explicit height, ie. does not match
the condition in https://drafts.csswg.org/css-flexbox/#definite-sizes

Bug: 885185

Change-Id: Iba226f30e1e02e3a11273fa45fcdf1cef897120c
Reviewed-on: https://chromium-review.googlesource.com/c/1311534
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604483}