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Before running the grid track sizing algorithm, there is a prelayout
step which takes care of the baseline alignment of the items.
In order to do that, we estimate the size of the grid area, since we
have not calculated the final size yet.

The problem was that, when calculating this estimate, the available
column space had not been set yet. So if a column had a percentage track
sizing function, it would be treated as auto and the estimated size
would be wrong.

This patch sets the available column space so that we can resolve
percentage track sizing functions and get a more correct estimate.

Bug: 1121761

TEST=external/wpt/css/css-grid/alignment/self-baseline/grid-self-baseline-008.html

Change-Id: Ic4410b0a80b92afa5adfd62187ec236bd4fd3ba0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2375649
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Reviewed-by: Javier Fernandez <jfernandez@igalia.com>
Cr-Commit-Position: refs/heads/master@{#801631}