commit f9d1bad60ba752e0089d1a5a8ce165d45a0f35b0
author mstensho@opera.com <mstensho@opera.com> Thu Jan 15 20:29:50 2015
committer mstensho@opera.com <mstensho@opera.com> Thu Jan 15 20:29:50 2015
tree 8bb73cbe4cce048b76a5eef6abbc624c041ef14c
parent 87ea1414e0d373dbe3894d197dc1a17e2983aef2

[Slimming paint] [New Multicolumn] Repaint column rules when they change.

And DON'T paint them when they don't change, or we'll get an assertion failure.

Column rules are painted by an anonymous RenderMultiColumnSet, while
-webkit-column-rule is specified on the parent multicol, so some extra work is
required to properly invalidate the column set(s).

BUG=449118
R=chrishtr@chromium.org

Review URL: https://codereview.chromium.org/834653003

git-svn-id: svn://svn.chromium.org/blink/trunk@188489 bbb929c8-8fbe-4397-9dbb-9b2b20218538