[SP] Mark time-multiple-fields-stepup-stepdown-from-renderer.html as SLOW
[SP] Mark time-multiple-fields-stepup-stepdown-from-renderer.html as SLOW

time-multiple-fields-stepup-stepdown-from-renderer.html is marked as
SLOW for non-SP; we should mark it as SLOW for SP as well.

It currently times out flakily:
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=time-multiple-fields-stepup-stepdown-from-renderer.html

TBR=chrishtr

Review URL: https://codereview.chromium.org/1103413005

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@194573 bbb929c8-8fbe-4397-9dbb-9b2b20218538

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk