Mark a test as slow.
Mark a test as slow.

TBR=toyoshim@chromium.org

Review URL: https://codereview.chromium.org/26225003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@159270 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