Make sure that no column rows get negative flow thread portion heights.

BUG=510390
R=dsinclair@chromium.org

Review URL: https://codereview.chromium.org/1241703005

git-svn-id: svn://svn.chromium.org/blink/trunk@198970 bbb929c8-8fbe-4397-9dbb-9b2b20218538
4 files changed
tree: 17861b8b80e592bb61298c0b27af361d9f8a6eeb
  1. third_party/