Mark stateful-animator.https.html flaky test as crashy test.

Pass/Timeout was already excluded, but Crash was left off.

BUG=1014812
TBR=waffles

Change-Id: Ib2da88c9dedbb46f5a00893d9b37a7e721619d03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1897856Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712225}

third_party/blink/web_tests/TestExpectations

@@ -5729,7 +5729,7 @@ crbug.com/925325 [ Win ] storage/indexeddb/index-population.html [ Pass Timeout
 crbug.com/1018064 [ Mac10.13 ] virtual/threaded/http/tests/devtools/tracing/timeline-js/timeline-js-line-level-profile-end-to-end.js [ Pass Timeout ]
 
 # Sheriff 2019-10-30
-crbug.com/1014810 [ Mac ] virtual/threaded/external/wpt/animation-worklet/stateful-animator.https.html [ Pass Timeout ]
+crbug.com/1014810 [ Mac ] virtual/threaded/external/wpt/animation-worklet/stateful-animator.https.html [ Pass Timeout Crash ]
 crbug.com/1019662 external/wpt/html/dom/idlharness.worker.html [ Pass Timeout ]
 crbug.com/1019663 external/wpt/web-nfc/NDEFReader_options.https.html [ Failure Pass ]