[CSS Grid Layout] Only stretch tracks with 'auto' max-content sizing.

There was an ambiguity regarding the meaning of the 'auto' sized tracks,
whcih are the ones allowed to be stretched by Content Alignment properties.

this issue has been clarified by the spec editors and now we consider them
as the ones with an 'auto' max-content sizing function.

BUG=249451, 376823

Review URL: https://codereview.chromium.org/1264733003

git-svn-id: svn://svn.chromium.org/blink/trunk@200506 bbb929c8-8fbe-4397-9dbb-9b2b20218538
3 files changed
tree: bfae61611c78ae36bb978be54c69f188bc6fca80
  1. third_party/