GitLab

Previously because one table cell may paint its collapsed borders
multiple times, we enclose all collapsed border drawings in a
ScopeRecorder.

However, actually a table cell paints each border only once. When it
paint collapsed borders multiple times, it just paint different borders
in different time.

Use display item type to distinguish the different borders to avoid
the ScopeRecorder.

Also revert https://codereview.chromium.org/1234463005 to invalidate
table cells with changed collapsed borders.

BUG=510492

Review URL: https://codereview.chromium.org/1306433002

git-svn-id: svn://svn.chromium.org/blink/trunk@201002 bbb929c8-8fbe-4397-9dbb-9b2b20218538