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Reland: https://codereview.chromium.org/992483002

When an element in a cell has a percent height and the cell has a fixed height we
currently let the element ignore the height on the cell and instead let its content
determine the height of the cell (and the row).

Instead we should follow FF/Presto/Edge and the rendering agreed on the WG list
and let the element calculate itself as a percentage of its parent, the cell's
height.

https://lists.w3.org/Archives/Public/www-style/2015Mar/0101.html

BUG=465096,468699

Review-Url: https://codereview.chromium.org/2037783002
Cr-Commit-Position: refs/heads/master@{#397799}