Mark animations/compositor-start-event-timing.html as flaky
Mark animations/compositor-start-event-timing.html as flaky

BUG=364640
TBR=dstockwell@chromium.org

Review URL: https://codereview.chromium.org/241473002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@171883 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