[css-tables-3] Resolving a percentage against a generated table-cell

Hi there!

In this testcase:
https://jsfiddle.net/GazzaS/wh1hap33/2/

We basically have a display: table-row containing a display: block,
leading to an anonymous generated table-cell.

How should the percentage in the display: block be resolved? Should it
be resolved against the anonymous table-cell, which does not have a
height (and therefore be indefinite), or should it be resolved against
the display: table-row (and thus be definite)?

This was inspired by Chrome's bug report at
https://bugs.chromium.org/p/chromium/issues/detail?id=604396

Thanks!
-Christian