Fix AUTOSIZING_DOM_DEBUG_INFO.

It now works without having to hack
DocumentLifecycle::stateAllowsTreeMutations.

Also, annotate SUPPRESSING clusters correctly.

Review URL: https://codereview.chromium.org/267743004

git-svn-id: svn://svn.chromium.org/blink/trunk@173173 bbb929c8-8fbe-4397-9dbb-9b2b20218538