tree e0b7ee93c9b87c1025ee47c334f687c035fc2f27
parent 9acb9b580f8faf96f25ee732d46486607ae6f237
author Manuel Rego Casasnovas <rego@igalia.com> 1508517562 -0700
committer Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> 1508520562 -0700

[css-grid] Take into account min size constrains for stretching auto tracks

In r501249 we moved the stretch phase as the last step of
the track sizing algorithm.
However this introduced a regression as we were no longer
taking into account the grid container min-width|height constraints
during this step.

The CSS WG modified the spec so it now defines what to do
in these situations (https://drafts.csswg.org/css-grid/#algo-stretch):
  "If the free space is indefinite, but the grid container
   has a definite min-width/height, use that size to calculate
   the free space for this step instead."

This patch adds a new method
GridTrackSizingAlgorithmStrategy::FreeSpaceForStretchAutoTracksStep().
When we're in the DefiniteSizeStrategy it just returns the current
free space. For the IndefiniteSizeStrategy it uses the min size
of the grid container (respecting min-width|height properties)
to calculate the free space.

BUG=773625
TEST=external/wpt/css/css-grid-1/layout-algorithm/grid-stretch-respects-min-size-001.html

Change-Id: I8864f9c5885e3caea534c4b69acd93ad28eb5bc9
Reviewed-on: https://chromium-review.googlesource.com/720918
Commit-Queue: Manuel Rego Casasnovas <rego@igalia.com>
Reviewed-by: Javier Fernandez <jfernandez@igalia.com>
Cr-Commit-Position: refs/heads/master@{#510461}