Oilpan: add transition types to shadow DOM supporting objects.

R=haraken@chromium.org,ager@chromium.org
BUG=357163

Review URL: https://codereview.chromium.org/277213004

git-svn-id: svn://svn.chromium.org/blink/trunk@174084 bbb929c8-8fbe-4397-9dbb-9b2b20218538