[mac] scroll-descendant-with-cached-cliprects.html [ NeedsRebaseline ]

Rebaseline fast/layers/scroll-descendant-with-cached-cliprects.html on mac
after blink r181475 and r181499

TBR=ccameron@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=409708

Review URL: https://codereview.chromium.org/547233002

git-svn-id: svn://svn.chromium.org/blink/trunk@181520 bbb929c8-8fbe-4397-9dbb-9b2b20218538