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On crrev.com/358816, among other things, we added a second pass of the track
sizing algorithm for rows in order to properly compute row sizes when the
height was indefinite. We did that in order to have a symmetrical
implementation for columns and rows, but unfortunatelly that was not
correct.

Apart from issuing incorrect results in some cases it created a huge
performance issue in the case of nested grids because we were exponentially
increasing the amount of executions of the track sizing algorithm. The attached
performance test shows a 350% improvement with the patch.

BUG=619629

Review-Url: https://codereview.chromium.org/2339983002
Cr-Commit-Position: refs/heads/master@{#418892}