[css-grid] repeat() syntax should take a <track-list> argument
The repeat() notation used to allow just 1 <track-size> as second argument.
It was recently changed to support <track-list> instead, meaning that we can
pass an arbitrary number of track sizes and line numbers.
It has been working for some time for repeat() if the first argument was
a positive integer, but it requires some changes for the auto repeat cases
(auto-fill and auto-fit).
BUG=619930
Review-Url: https://codereview.chromium.org/2161003003
Cr-Commit-Position: refs/heads/master@{#406540}
13 files changed
