Mark some animation tests as MISSING.

This is a temporary workaround, and should be removed when the V8 fix is
merged into the tree.

BUG=390732
TBR=pilgrim@chromium.org

Review URL: https://codereview.chromium.org/378463002

git-svn-id: svn://svn.chromium.org/blink/trunk@177570 bbb929c8-8fbe-4397-9dbb-9b2b20218538