[New Multicolumn] Minimal support for nested multicol in RenderLayer.
Getting proper support for nested multicol layout (or multicol inside paged) is
going to require a lot of work (need to support multiple column rows), but in
the meantime we should at least be able to paint what we have laid out. Layout
already works fine as long as the inner multicol lives in only one outer
column. Now painting works too.
R=chrishtr@chromium.org
BUG=423076
Review URL: https://codereview.chromium.org/816683002
git-svn-id: svn://svn.chromium.org/blink/trunk@188169 bbb929c8-8fbe-4397-9dbb-9b2b20218538
8 files changed
