Mark two tests as expected to ASSERT

These tests likely assert because we enabled some stricter state machine
asserts. I've filed a bug and assigned it to Ojan.

TBR=ojan@chromium.org
BUG=343179

Review URL: https://codereview.chromium.org/155763008

git-svn-id: svn://svn.chromium.org/blink/trunk@167027 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Mark test as flaky crash

This issue seems to be related to the new Web Animations engine.

TBR=dstockwell@chromium.org
BUG=343185

Review URL: https://codereview.chromium.org/137493010

git-svn-id: svn://svn.chromium.org/blink/trunk@167028 bbb929c8-8fbe-4397-9dbb-9b2b20218538