commit 15d2700c9e810c7d169dad97a6f2ac347797ef12
author mstensho@opera.com <mstensho@opera.com@bbb929c8-8fbe-4397-9dbb-9b2b20218538> Thu May 15 15:44:42 2014
committer mstensho@opera.com <mstensho@opera.com@bbb929c8-8fbe-4397-9dbb-9b2b20218538> Thu May 15 15:44:42 2014
tree 15d5bb8eaebf6c8a1279e034ae8c00601295add7
parent 4ed3d0a4445c8b032c9ea44330885b1294b38ce9

[New Multicolumn] Guard against zero or negative space shortage.

We need positive values in order to get anywhere when stretching columns
in order to balance them, and we may get called with zero or negative
values when there's zero-height content at column boundaries, or when we
set an early break in order to honor widows in the next column.

BUG=369985

Review URL: https://codereview.chromium.org/263203003

git-svn-id: svn://svn.chromium.org/blink/trunk@174088 bbb929c8-8fbe-4397-9dbb-9b2b20218538