This creates a multiplier-inheriting cluster at the boundary where TextAutosizer::containerShouldBeAutosized suppresses or re-enables autosizing.

BUG=302005

Review URL: https://codereview.chromium.org/137123004

git-svn-id: svn://svn.chromium.org/blink/trunk@165181 bbb929c8-8fbe-4397-9dbb-9b2b20218538